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git/compat/mingw.c
Johannes Schindelin 9160068ac6 msvc: avoid calling access("NUL", flags) 
Apparently this is not supported with Microsoft's Universal C Runtime.
So let's not actually do that.

Instead, just return success because we _know_ that we expect the `NUL`
device to be present.

Side note: it is possible to turn off the "Null device driver" and
thereby disable `NUL`. Too many things are broken if this driver is
disabled, therefore it is not worth bothering to try to detect its
presence when `access()` is called.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-16 12:05:32 -07:00

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#include "../git-compat-util.h"
#include "win32.h"
#include <conio.h>
#include <wchar.h>
#include "../strbuf.h"
#include "../run-command.h"
#include "../cache.h"
#include "win32/lazyload.h"
#include "../config.h"
#include "dir.h"
#define HCAST(type, handle) ((type)(intptr_t)handle)
static const int delay[] = { 0, 1, 10, 20, 40 };
void open_in_gdb(void)
{
static struct child_process cp = CHILD_PROCESS_INIT;
extern char *_pgmptr;
strvec_pushl(&cp.args, "mintty", "gdb", NULL);
strvec_pushf(&cp.args, "--pid=%d", getpid());
cp.clean_on_exit = 1;
if (start_command(&cp) < 0)
die_errno("Could not start gdb");
sleep(1);
}
int err_win_to_posix(DWORD winerr)
{
int error = ENOSYS;
switch(winerr) {
case ERROR_ACCESS_DENIED: error = EACCES; break;
case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
case ERROR_ALREADY_EXISTS: error = EEXIST; break;
case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
case ERROR_BAD_COMMAND: error = EIO; break;
case ERROR_BAD_DEVICE: error = ENODEV; break;
case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
case ERROR_BAD_FORMAT: error = ENOEXEC; break;
case ERROR_BAD_LENGTH: error = EINVAL; break;
case ERROR_BAD_PATHNAME: error = ENOENT; break;
case ERROR_BAD_PIPE: error = EPIPE; break;
case ERROR_BAD_UNIT: error = ENODEV; break;
case ERROR_BAD_USERNAME: error = EINVAL; break;
case ERROR_BROKEN_PIPE: error = EPIPE; break;
case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
case ERROR_BUSY: error = EBUSY; break;
case ERROR_BUSY_DRIVE: error = EBUSY; break;
case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
case ERROR_CANNOT_MAKE: error = EACCES; break;
case ERROR_CANTOPEN: error = EIO; break;
case ERROR_CANTREAD: error = EIO; break;
case ERROR_CANTWRITE: error = EIO; break;
case ERROR_CRC: error = EIO; break;
case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
case ERROR_DEVICE_IN_USE: error = EBUSY; break;
case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
case ERROR_DIRECTORY: error = EINVAL; break;
case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
case ERROR_DISK_CHANGE: error = EIO; break;
case ERROR_DISK_FULL: error = ENOSPC; break;
case ERROR_DRIVE_LOCKED: error = EBUSY; break;
case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
case ERROR_FILE_EXISTS: error = EEXIST; break;
case ERROR_FILE_INVALID: error = ENODEV; break;
case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
case ERROR_GEN_FAILURE: error = EIO; break;
case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
case ERROR_INVALID_ACCESS: error = EACCES; break;
case ERROR_INVALID_ADDRESS: error = EFAULT; break;
case ERROR_INVALID_BLOCK: error = EFAULT; break;
case ERROR_INVALID_DATA: error = EINVAL; break;
case ERROR_INVALID_DRIVE: error = ENODEV; break;
case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
case ERROR_INVALID_FLAGS: error = EINVAL; break;
case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
case ERROR_INVALID_HANDLE: error = EBADF; break;
case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
case ERROR_INVALID_NAME: error = EINVAL; break;
case ERROR_INVALID_OWNER: error = EINVAL; break;
case ERROR_INVALID_PARAMETER: error = EINVAL; break;
case ERROR_INVALID_PASSWORD: error = EPERM; break;
case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
case ERROR_INVALID_WORKSTATION: error = EACCES; break;
case ERROR_IO_DEVICE: error = EIO; break;
case ERROR_IO_INCOMPLETE: error = EINTR; break;
case ERROR_LOCKED: error = EBUSY; break;
case ERROR_LOCK_VIOLATION: error = EACCES; break;
case ERROR_LOGON_FAILURE: error = EACCES; break;
case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
case ERROR_MORE_DATA: error = EPIPE; break;
case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
case ERROR_NOACCESS: error = EFAULT; break;
case ERROR_NONE_MAPPED: error = EINVAL; break;
case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
case ERROR_NOT_READY: error = EAGAIN; break;
case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
case ERROR_NO_DATA: error = EPIPE; break;
case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
case ERROR_OPEN_FAILED: error = EIO; break;
case ERROR_OPEN_FILES: error = EBUSY; break;
case ERROR_OPERATION_ABORTED: error = EINTR; break;
case ERROR_OUTOFMEMORY: error = ENOMEM; break;
case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
case ERROR_PATH_BUSY: error = EBUSY; break;
case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
case ERROR_PIPE_BUSY: error = EBUSY; break;
case ERROR_PIPE_CONNECTED: error = EPIPE; break;
case ERROR_PIPE_LISTENING: error = EPIPE; break;
case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
case ERROR_READ_FAULT: error = EIO; break;
case ERROR_SEEK: error = EIO; break;
case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
case ERROR_SHARING_VIOLATION: error = EACCES; break;
case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
case ERROR_SWAPERROR: error = ENOENT; break;
case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
case ERROR_WRITE_FAULT: error = EIO; break;
case ERROR_WRITE_PROTECT: error = EROFS; break;
}
return error;
}
static inline int is_file_in_use_error(DWORD errcode)
{
switch (errcode) {
case ERROR_SHARING_VIOLATION:
case ERROR_ACCESS_DENIED:
return 1;
}
return 0;
}
static int read_yes_no_answer(void)
{
char answer[1024];
if (fgets(answer, sizeof(answer), stdin)) {
size_t answer_len = strlen(answer);
int got_full_line = 0, c;
/* remove the newline */
if (answer_len >= 2 && answer[answer_len-2] == '\r') {
answer[answer_len-2] = '\0';
got_full_line = 1;
} else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
answer[answer_len-1] = '\0';
got_full_line = 1;
}
/* flush the buffer in case we did not get the full line */
if (!got_full_line)
while ((c = getchar()) != EOF && c != '\n')
;
} else
/* we could not read, return the
* default answer which is no */
return 0;
if (tolower(answer[0]) == 'y' && !answer[1])
return 1;
if (!strncasecmp(answer, "yes", sizeof(answer)))
return 1;
if (tolower(answer[0]) == 'n' && !answer[1])
return 0;
if (!strncasecmp(answer, "no", sizeof(answer)))
return 0;
/* did not find an answer we understand */
return -1;
}
static int ask_yes_no_if_possible(const char *format, ...)
{
char question[4096];
const char *retry_hook[] = { NULL, NULL, NULL };
va_list args;
va_start(args, format);
vsnprintf(question, sizeof(question), format, args);
va_end(args);
if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
retry_hook[1] = question;
return !run_command_v_opt(retry_hook, 0);
}
if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
return 0;
while (1) {
int answer;
fprintf(stderr, "%s (y/n) ", question);
if ((answer = read_yes_no_answer()) >= 0)
return answer;
fprintf(stderr, "Sorry, I did not understand your answer. "
"Please type 'y' or 'n'\n");
}
}
/* Windows only */
enum hide_dotfiles_type {
HIDE_DOTFILES_FALSE = 0,
HIDE_DOTFILES_TRUE,
HIDE_DOTFILES_DOTGITONLY
};
static int core_restrict_inherited_handles = -1;
static enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
static char *unset_environment_variables;
int mingw_core_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "core.hidedotfiles")) {
if (value && !strcasecmp(value, "dotgitonly"))
hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
else
hide_dotfiles = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "core.unsetenvvars")) {
free(unset_environment_variables);
unset_environment_variables = xstrdup(value);
return 0;
}
if (!strcmp(var, "core.restrictinheritedhandles")) {
if (value && !strcasecmp(value, "auto"))
core_restrict_inherited_handles = -1;
else
core_restrict_inherited_handles =
git_config_bool(var, value);
return 0;
}
return 0;
}
/* Normalizes NT paths as returned by some low-level APIs. */
static wchar_t *normalize_ntpath(wchar_t *wbuf)
{
int i;
/* fix absolute path prefixes */
if (wbuf[0] == '\\') {
/* strip NT namespace prefixes */
if (!wcsncmp(wbuf, L"\\??\\", 4) ||
!wcsncmp(wbuf, L"\\\\?\\", 4))
wbuf += 4;
else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
wbuf += 12;
/* replace remaining '...UNC\' with '\\' */
if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
wbuf += 2;
*wbuf = '\\';
}
}
/* convert backslashes to slashes */
for (i = 0; wbuf[i]; i++)
if (wbuf[i] == '\\')
wbuf[i] = '/';
return wbuf;
}
int mingw_unlink(const char *pathname)
{
int ret, tries = 0;
wchar_t wpathname[MAX_PATH];
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
if (DeleteFileW(wpathname))
return 0;
/* read-only files cannot be removed */
_wchmod(wpathname, 0666);
while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
if (!is_file_in_use_error(GetLastError()))
break;
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
}
while (ret == -1 && is_file_in_use_error(GetLastError()) &&
ask_yes_no_if_possible("Unlink of file '%s' failed. "
"Should I try again?", pathname))
ret = _wunlink(wpathname);
return ret;
}
static int is_dir_empty(const wchar_t *wpath)
{
WIN32_FIND_DATAW findbuf;
HANDLE handle;
wchar_t wbuf[MAX_PATH + 2];
wcscpy(wbuf, wpath);
wcscat(wbuf, L"\\*");
handle = FindFirstFileW(wbuf, &findbuf);
if (handle == INVALID_HANDLE_VALUE)
return GetLastError() == ERROR_NO_MORE_FILES;
while (!wcscmp(findbuf.cFileName, L".") ||
!wcscmp(findbuf.cFileName, L".."))
if (!FindNextFileW(handle, &findbuf)) {
DWORD err = GetLastError();
FindClose(handle);
return err == ERROR_NO_MORE_FILES;
}
FindClose(handle);
return 0;
}
int mingw_rmdir(const char *pathname)
{
int ret, tries = 0;
wchar_t wpathname[MAX_PATH];
if (xutftowcs_path(wpathname, pathname) < 0)
return -1;
while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
if (!is_file_in_use_error(GetLastError()))
errno = err_win_to_posix(GetLastError());
if (errno != EACCES)
break;
if (!is_dir_empty(wpathname)) {
errno = ENOTEMPTY;
break;
}
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
}
while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
ask_yes_no_if_possible("Deletion of directory '%s' failed. "
"Should I try again?", pathname))
ret = _wrmdir(wpathname);
if (!ret)
invalidate_lstat_cache();
return ret;
}
static inline int needs_hiding(const char *path)
{
const char *basename;
if (hide_dotfiles == HIDE_DOTFILES_FALSE)
return 0;
/* We cannot use basename(), as it would remove trailing slashes */
win32_skip_dos_drive_prefix((char **)&path);
if (!*path)
return 0;
for (basename = path; *path; path++)
if (is_dir_sep(*path)) {
do {
path++;
} while (is_dir_sep(*path));
/* ignore trailing slashes */
if (*path)
basename = path;
else
break;
}
if (hide_dotfiles == HIDE_DOTFILES_TRUE)
return *basename == '.';
assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
return !strncasecmp(".git", basename, 4) &&
(!basename[4] || is_dir_sep(basename[4]));
}
static int set_hidden_flag(const wchar_t *path, int set)
{
DWORD original = GetFileAttributesW(path), modified;
if (set)
modified = original | FILE_ATTRIBUTE_HIDDEN;
else
modified = original & ~FILE_ATTRIBUTE_HIDDEN;
if (original == modified || SetFileAttributesW(path, modified))
return 0;
errno = err_win_to_posix(GetLastError());
return -1;
}
int mingw_mkdir(const char *path, int mode)
{
int ret;
wchar_t wpath[MAX_PATH];
if (!is_valid_win32_path(path, 0)) {
errno = EINVAL;
return -1;
}
if (xutftowcs_path(wpath, path) < 0)
return -1;
ret = _wmkdir(wpath);
if (!ret && needs_hiding(path))
return set_hidden_flag(wpath, 1);
return ret;
}
/*
* Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
* is documented in [1] as opening a writable file handle in append mode.
* (It is believed that) this is atomic since it is maintained by the
* kernel unlike the O_APPEND flag which is racily maintained by the CRT.
*
* [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
*
* This trick does not appear to work for named pipes. Instead it creates
* a named pipe client handle that cannot be written to. Callers should
* just use the regular _wopen() for them. (And since client handle gets
* bound to a unique server handle, it isn't really an issue.)
*/
static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
{
HANDLE handle;
int fd;
DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
/* only these flags are supported */
if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
return errno = ENOSYS, -1;
/*
* FILE_SHARE_WRITE is required to permit child processes
* to append to the file.
*/
handle = CreateFileW(wfilename, FILE_APPEND_DATA,
FILE_SHARE_WRITE | FILE_SHARE_READ,
NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
if (handle == INVALID_HANDLE_VALUE) {
DWORD err = GetLastError();
/*
* Some network storage solutions (e.g. Isilon) might return
* ERROR_INVALID_PARAMETER instead of expected error
* ERROR_PATH_NOT_FOUND, which results in an unknown error. If
* so, let's turn the error to ERROR_PATH_NOT_FOUND instead.
*/
if (err == ERROR_INVALID_PARAMETER)
err = ERROR_PATH_NOT_FOUND;
errno = err_win_to_posix(err);
return -1;
}
/*
* No O_APPEND here, because the CRT uses it only to reset the
* file pointer to EOF before each write(); but that is not
* necessary (and may lead to races) for a file created with
* FILE_APPEND_DATA.
*/
fd = _open_osfhandle((intptr_t)handle, O_BINARY);
if (fd < 0)
CloseHandle(handle);
return fd;
}
/*
* Does the pathname map to the local named pipe filesystem?
* That is, does it have a "//./pipe/" prefix?
*/
static int is_local_named_pipe_path(const char *filename)
{
return (is_dir_sep(filename[0]) &&
is_dir_sep(filename[1]) &&
filename[2] == '.' &&
is_dir_sep(filename[3]) &&
!strncasecmp(filename+4, "pipe", 4) &&
is_dir_sep(filename[8]) &&
filename[9]);
}
int mingw_open (const char *filename, int oflags, ...)
{
typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
va_list args;
unsigned mode;
int fd, create = (oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL);
wchar_t wfilename[MAX_PATH];
open_fn_t open_fn;
va_start(args, oflags);
mode = va_arg(args, int);
va_end(args);
if (!is_valid_win32_path(filename, !create)) {
errno = create ? EINVAL : ENOENT;
return -1;
}
if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
open_fn = mingw_open_append;
else
open_fn = _wopen;
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (xutftowcs_path(wfilename, filename) < 0)
return -1;
fd = open_fn(wfilename, oflags, mode);
if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
DWORD attrs = GetFileAttributesW(wfilename);
if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
errno = EISDIR;
}
if ((oflags & O_CREAT) && needs_hiding(filename)) {
/*
* Internally, _wopen() uses the CreateFile() API which errors
* out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
* specified and an already existing file's attributes do not
* match *exactly*. As there is no mode or flag we can set that
* would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
* again *without* the O_CREAT flag (that corresponds to the
* CREATE_ALWAYS flag of CreateFile()).
*/
if (fd < 0 && errno == EACCES)
fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
if (fd >= 0 && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
}
return fd;
}
static BOOL WINAPI ctrl_ignore(DWORD type)
{
return TRUE;
}
#undef fgetc
int mingw_fgetc(FILE *stream)
{
int ch;
if (!isatty(_fileno(stream)))
return fgetc(stream);
SetConsoleCtrlHandler(ctrl_ignore, TRUE);
while (1) {
ch = fgetc(stream);
if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
break;
/* Ctrl+C was pressed, simulate SIGINT and retry */
mingw_raise(SIGINT);
}
SetConsoleCtrlHandler(ctrl_ignore, FALSE);
return ch;
}
#undef fopen
FILE *mingw_fopen (const char *filename, const char *otype)
{
int hide = needs_hiding(filename);
FILE *file;
wchar_t wfilename[MAX_PATH], wotype[4];
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (!is_valid_win32_path(filename, 1)) {
int create = otype && strchr(otype, 'w');
errno = create ? EINVAL : ENOENT;
return NULL;
} else if (xutftowcs_path(wfilename, filename) < 0)
return NULL;
if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
return NULL;
if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
error("could not unhide %s", filename);
return NULL;
}
file = _wfopen(wfilename, wotype);
if (!file && GetLastError() == ERROR_INVALID_NAME)
errno = ENOENT;
if (file && hide && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
return file;
}
FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
{
int hide = needs_hiding(filename);
FILE *file;
wchar_t wfilename[MAX_PATH], wotype[4];
if (filename && !strcmp(filename, "/dev/null"))
wcscpy(wfilename, L"nul");
else if (!is_valid_win32_path(filename, 1)) {
int create = otype && strchr(otype, 'w');
errno = create ? EINVAL : ENOENT;
return NULL;
} else if (xutftowcs_path(wfilename, filename) < 0)
return NULL;
if (xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
return NULL;
if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
error("could not unhide %s", filename);
return NULL;
}
file = _wfreopen(wfilename, wotype, stream);
if (file && hide && set_hidden_flag(wfilename, 1))
warning("could not mark '%s' as hidden.", filename);
return file;
}
#undef fflush
int mingw_fflush(FILE *stream)
{
int ret = fflush(stream);
/*
* write() is used behind the scenes of stdio output functions.
* Since git code does not check for errors after each stdio write
* operation, it can happen that write() is called by a later
* stdio function even if an earlier write() call failed. In the
* case of a pipe whose readable end was closed, only the first
* call to write() reports EPIPE on Windows. Subsequent write()
* calls report EINVAL. It is impossible to notice whether this
* fflush invocation triggered such a case, therefore, we have to
* catch all EINVAL errors whole-sale.
*/
if (ret && errno == EINVAL)
errno = EPIPE;
return ret;
}
#undef write
ssize_t mingw_write(int fd, const void *buf, size_t len)
{
ssize_t result = write(fd, buf, len);
if (result < 0 && errno == EINVAL && buf) {
/* check if fd is a pipe */
HANDLE h = (HANDLE) _get_osfhandle(fd);
if (GetFileType(h) == FILE_TYPE_PIPE)
errno = EPIPE;
else
errno = EINVAL;
}
return result;
}
int mingw_access(const char *filename, int mode)
{
wchar_t wfilename[MAX_PATH];
if (!strcmp("nul", filename) || !strcmp("/dev/null", filename))
return 0;
if (xutftowcs_path(wfilename, filename) < 0)
return -1;
/* X_OK is not supported by the MSVCRT version */
return _waccess(wfilename, mode & ~X_OK);
}
int mingw_chdir(const char *dirname)
{
wchar_t wdirname[MAX_PATH];
if (xutftowcs_path(wdirname, dirname) < 0)
return -1;
return _wchdir(wdirname);
}
int mingw_chmod(const char *filename, int mode)
{
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, filename) < 0)
return -1;
return _wchmod(wfilename, mode);
}
/*
* The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
* Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
*/
static inline long long filetime_to_hnsec(const FILETIME *ft)
{
long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
/* Windows to Unix Epoch conversion */
return winTime - 116444736000000000LL;
}
static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
{
long long hnsec = filetime_to_hnsec(ft);
ts->tv_sec = (time_t)(hnsec / 10000000);
ts->tv_nsec = (hnsec % 10000000) * 100;
}
/**
* Verifies that safe_create_leading_directories() would succeed.
*/
static int has_valid_directory_prefix(wchar_t *wfilename)
{
int n = wcslen(wfilename);
while (n > 0) {
wchar_t c = wfilename[--n];
DWORD attributes;
if (!is_dir_sep(c))
continue;
wfilename[n] = L'\0';
attributes = GetFileAttributesW(wfilename);
wfilename[n] = c;
if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
attributes == FILE_ATTRIBUTE_DEVICE)
return 1;
if (attributes == INVALID_FILE_ATTRIBUTES)
switch (GetLastError()) {
case ERROR_PATH_NOT_FOUND:
continue;
case ERROR_FILE_NOT_FOUND:
/* This implies parent directory exists. */
return 1;
}
return 0;
}
return 1;
}
/* We keep the do_lstat code in a separate function to avoid recursion.
* When a path ends with a slash, the stat will fail with ENOENT. In
* this case, we strip the trailing slashes and stat again.
*
* If follow is true then act like stat() and report on the link
* target. Otherwise report on the link itself.
*/
static int do_lstat(int follow, const char *file_name, struct stat *buf)
{
WIN32_FILE_ATTRIBUTE_DATA fdata;
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, file_name) < 0)
return -1;
if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
buf->st_ino = 0;
buf->st_gid = 0;
buf->st_uid = 0;
buf->st_nlink = 1;
buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
buf->st_size = fdata.nFileSizeLow |
(((off_t)fdata.nFileSizeHigh)<<32);
buf->st_dev = buf->st_rdev = 0; /* not used by Git */
filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
WIN32_FIND_DATAW findbuf;
HANDLE handle = FindFirstFileW(wfilename, &findbuf);
if (handle != INVALID_HANDLE_VALUE) {
if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
(findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
if (follow) {
char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
} else {
buf->st_mode = S_IFLNK;
}
buf->st_mode |= S_IREAD;
if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
buf->st_mode |= S_IWRITE;
}
FindClose(handle);
}
}
return 0;
}
switch (GetLastError()) {
case ERROR_ACCESS_DENIED:
case ERROR_SHARING_VIOLATION:
case ERROR_LOCK_VIOLATION:
case ERROR_SHARING_BUFFER_EXCEEDED:
errno = EACCES;
break;
case ERROR_BUFFER_OVERFLOW:
errno = ENAMETOOLONG;
break;
case ERROR_NOT_ENOUGH_MEMORY:
errno = ENOMEM;
break;
case ERROR_PATH_NOT_FOUND:
if (!has_valid_directory_prefix(wfilename)) {
errno = ENOTDIR;
break;
}
/* fallthru */
default:
errno = ENOENT;
break;
}
return -1;
}
/* We provide our own lstat/fstat functions, since the provided
* lstat/fstat functions are so slow. These stat functions are
* tailored for Git's usage (read: fast), and are not meant to be
* complete. Note that Git stat()s are redirected to mingw_lstat()
* too, since Windows doesn't really handle symlinks that well.
*/
static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
{
int namelen;
char alt_name[PATH_MAX];
if (!do_lstat(follow, file_name, buf))
return 0;
/* if file_name ended in a '/', Windows returned ENOENT;
* try again without trailing slashes
*/
if (errno != ENOENT)
return -1;
namelen = strlen(file_name);
if (namelen && file_name[namelen-1] != '/')
return -1;
while (namelen && file_name[namelen-1] == '/')
--namelen;
if (!namelen || namelen >= PATH_MAX)
return -1;
memcpy(alt_name, file_name, namelen);
alt_name[namelen] = 0;
return do_lstat(follow, alt_name, buf);
}
static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
{
BY_HANDLE_FILE_INFORMATION fdata;
if (!GetFileInformationByHandle(hnd, &fdata)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
buf->st_ino = 0;
buf->st_gid = 0;
buf->st_uid = 0;
buf->st_nlink = 1;
buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
buf->st_size = fdata.nFileSizeLow |
(((off_t)fdata.nFileSizeHigh)<<32);
buf->st_dev = buf->st_rdev = 0; /* not used by Git */
filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
return 0;
}
int mingw_lstat(const char *file_name, struct stat *buf)
{
return do_stat_internal(0, file_name, buf);
}
int mingw_stat(const char *file_name, struct stat *buf)
{
return do_stat_internal(1, file_name, buf);
}
int mingw_fstat(int fd, struct stat *buf)
{
HANDLE fh = (HANDLE)_get_osfhandle(fd);
DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
switch (type) {
case FILE_TYPE_DISK:
return get_file_info_by_handle(fh, buf);
case FILE_TYPE_CHAR:
case FILE_TYPE_PIPE:
/* initialize stat fields */
memset(buf, 0, sizeof(*buf));
buf->st_nlink = 1;
if (type == FILE_TYPE_CHAR) {
buf->st_mode = _S_IFCHR;
} else {
buf->st_mode = _S_IFIFO;
if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
buf->st_size = avail;
}
return 0;
default:
errno = EBADF;
return -1;
}
}
static inline void time_t_to_filetime(time_t t, FILETIME *ft)
{
long long winTime = t * 10000000LL + 116444736000000000LL;
ft->dwLowDateTime = winTime;
ft->dwHighDateTime = winTime >> 32;
}
int mingw_utime (const char *file_name, const struct utimbuf *times)
{
FILETIME mft, aft;
int fh, rc;
DWORD attrs;
wchar_t wfilename[MAX_PATH];
if (xutftowcs_path(wfilename, file_name) < 0)
return -1;
/* must have write permission */
attrs = GetFileAttributesW(wfilename);
if (attrs != INVALID_FILE_ATTRIBUTES &&
(attrs & FILE_ATTRIBUTE_READONLY)) {
/* ignore errors here; open() will report them */
SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
}
if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
rc = -1;
goto revert_attrs;
}
if (times) {
time_t_to_filetime(times->modtime, &mft);
time_t_to_filetime(times->actime, &aft);
} else {
GetSystemTimeAsFileTime(&mft);
aft = mft;
}
if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
errno = EINVAL;
rc = -1;
} else
rc = 0;
close(fh);
revert_attrs:
if (attrs != INVALID_FILE_ATTRIBUTES &&
(attrs & FILE_ATTRIBUTE_READONLY)) {
/* ignore errors again */
SetFileAttributesW(wfilename, attrs);
}
return rc;
}
#undef strftime
size_t mingw_strftime(char *s, size_t max,
const char *format, const struct tm *tm)
{
/* a pointer to the original strftime in case we can't find the UCRT version */
static size_t (*fallback)(char *, size_t, const char *, const struct tm *) = strftime;
size_t ret;
DECLARE_PROC_ADDR(ucrtbase.dll, size_t, strftime, char *, size_t,
const char *, const struct tm *);
if (INIT_PROC_ADDR(strftime))
ret = strftime(s, max, format, tm);
else
ret = fallback(s, max, format, tm);
if (!ret && errno == EINVAL)
die("invalid strftime format: '%s'", format);
return ret;
}
unsigned int sleep (unsigned int seconds)
{
Sleep(seconds*1000);
return 0;
}
char *mingw_mktemp(char *template)
{
wchar_t wtemplate[MAX_PATH];
if (xutftowcs_path(wtemplate, template) < 0)
return NULL;
if (!_wmktemp(wtemplate))
return NULL;
if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
return NULL;
return template;
}
int mkstemp(char *template)
{
char *filename = mktemp(template);
if (filename == NULL)
return -1;
return open(filename, O_RDWR | O_CREAT, 0600);
}
int gettimeofday(struct timeval *tv, void *tz)
{
FILETIME ft;
long long hnsec;
GetSystemTimeAsFileTime(&ft);
hnsec = filetime_to_hnsec(&ft);
tv->tv_sec = hnsec / 10000000;
tv->tv_usec = (hnsec % 10000000) / 10;
return 0;
}
int pipe(int filedes[2])
{
HANDLE h[2];
/* this creates non-inheritable handles */
if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
if (filedes[0] < 0) {
CloseHandle(h[0]);
CloseHandle(h[1]);
return -1;
}
filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
if (filedes[1] < 0) {
close(filedes[0]);
CloseHandle(h[1]);
return -1;
}
return 0;
}
struct tm *gmtime_r(const time_t *timep, struct tm *result)
{
if (gmtime_s(result, timep) == 0)
return result;
return NULL;
}
struct tm *localtime_r(const time_t *timep, struct tm *result)
{
if (localtime_s(result, timep) == 0)
return result;
return NULL;
}
char *mingw_getcwd(char *pointer, int len)
{
wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
if (!ret || ret >= ARRAY_SIZE(cwd)) {
errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
return NULL;
}
ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
HANDLE hnd = CreateFileW(cwd, 0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (hnd == INVALID_HANDLE_VALUE)
return NULL;
ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
CloseHandle(hnd);
if (!ret || ret >= ARRAY_SIZE(wpointer))
return NULL;
if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
return NULL;
return pointer;
}
if (!ret || ret >= ARRAY_SIZE(wpointer))
return NULL;
if (xwcstoutf(pointer, wpointer, len) < 0)
return NULL;
convert_slashes(pointer);
return pointer;
}
/*
* See "Parsing C++ Command-Line Arguments" at Microsoft's Docs:
* https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
*/
static const char *quote_arg_msvc(const char *arg)
{
/* count chars to quote */
int len = 0, n = 0;
int force_quotes = 0;
char *q, *d;
const char *p = arg;
if (!*p) force_quotes = 1;
while (*p) {
if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
force_quotes = 1;
else if (*p == '"')
n++;
else if (*p == '\\') {
int count = 0;
while (*p == '\\') {
count++;
p++;
len++;
}
if (*p == '"' || !*p)
n += count*2 + 1;
continue;
}
len++;
p++;
}
if (!force_quotes && n == 0)
return arg;
/* insert \ where necessary */
d = q = xmalloc(st_add3(len, n, 3));
*d++ = '"';
while (*arg) {
if (*arg == '"')
*d++ = '\\';
else if (*arg == '\\') {
int count = 0;
while (*arg == '\\') {
count++;
*d++ = *arg++;
}
if (*arg == '"' || !*arg) {
while (count-- > 0)
*d++ = '\\';
/* don't escape the surrounding end quote */
if (!*arg)
break;
*d++ = '\\';
}
}
*d++ = *arg++;
}
*d++ = '"';
*d++ = '\0';
return q;
}
#include "quote.h"
static const char *quote_arg_msys2(const char *arg)
{
struct strbuf buf = STRBUF_INIT;
const char *p2 = arg, *p;
for (p = arg; *p; p++) {
int ws = isspace(*p);
if (!ws && *p != '\\' && *p != '"' && *p != '{' && *p != '\'' &&
*p != '?' && *p != '*' && *p != '~')
continue;
if (!buf.len)
strbuf_addch(&buf, '"');
if (p != p2)
strbuf_add(&buf, p2, p - p2);
if (*p == '\\' || *p == '"')
strbuf_addch(&buf, '\\');
p2 = p;
}
if (p == arg)
strbuf_addch(&buf, '"');
else if (!buf.len)
return arg;
else
strbuf_add(&buf, p2, p - p2);
strbuf_addch(&buf, '"');
return strbuf_detach(&buf, 0);
}
static const char *parse_interpreter(const char *cmd)
{
static char buf[100];
char *p, *opt;
int n, fd;
/* don't even try a .exe */
n = strlen(cmd);
if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
return NULL;
fd = open(cmd, O_RDONLY);
if (fd < 0)
return NULL;
n = read(fd, buf, sizeof(buf)-1);
close(fd);
if (n < 4) /* at least '#!/x' and not error */
return NULL;
if (buf[0] != '#' || buf[1] != '!')
return NULL;
buf[n] = '\0';
p = buf + strcspn(buf, "\r\n");
if (!*p)
return NULL;
*p = '\0';
if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
return NULL;
/* strip options */
if ((opt = strchr(p+1, ' ')))
*opt = '\0';
return p+1;
}
/*
* exe_only means that we only want to detect .exe files, but not scripts
* (which do not have an extension)
*/
static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
int isexe, int exe_only)
{
char path[MAX_PATH];
wchar_t wpath[MAX_PATH];
snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
if (xutftowcs_path(wpath, path) < 0)
return NULL;
if (!isexe && _waccess(wpath, F_OK) == 0)
return xstrdup(path);
wpath[wcslen(wpath)-4] = '\0';
if ((!exe_only || isexe) && _waccess(wpath, F_OK) == 0) {
if (!(GetFileAttributesW(wpath) & FILE_ATTRIBUTE_DIRECTORY)) {
path[strlen(path)-4] = '\0';
return xstrdup(path);
}
}
return NULL;
}
/*
* Determines the absolute path of cmd using the split path in path.
* If cmd contains a slash or backslash, no lookup is performed.
*/
static char *path_lookup(const char *cmd, int exe_only)
{
const char *path;
char *prog = NULL;
int len = strlen(cmd);
int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
if (strpbrk(cmd, "/\\"))
return xstrdup(cmd);
path = mingw_getenv("PATH");
if (!path)
return NULL;
while (!prog) {
const char *sep = strchrnul(path, ';');
int dirlen = sep - path;
if (dirlen)
prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
if (!*sep)
break;
path = sep + 1;
}
return prog;
}
static const wchar_t *wcschrnul(const wchar_t *s, wchar_t c)
{
while (*s && *s != c)
s++;
return s;
}
/* Compare only keys */
static int wenvcmp(const void *a, const void *b)
{
wchar_t *p = *(wchar_t **)a, *q = *(wchar_t **)b;
size_t p_len, q_len;
/* Find the keys */
p_len = wcschrnul(p, L'=') - p;
q_len = wcschrnul(q, L'=') - q;
/* If the length differs, include the shorter key's NUL */
if (p_len < q_len)
p_len++;
else if (p_len > q_len)
p_len = q_len + 1;
return _wcsnicmp(p, q, p_len);
}
/*
* Build an environment block combining the inherited environment
* merged with the given list of settings.
*
* Values of the form "KEY=VALUE" in deltaenv override inherited values.
* Values of the form "KEY" in deltaenv delete inherited values.
*
* Multiple entries in deltaenv for the same key are explicitly allowed.
*
* We return a contiguous block of UNICODE strings with a final trailing
* zero word.
*/
static wchar_t *make_environment_block(char **deltaenv)
{
wchar_t *wenv = GetEnvironmentStringsW(), *wdeltaenv, *result, *p;
size_t wlen, s, delta_size, size;
wchar_t **array = NULL;
size_t alloc = 0, nr = 0, i;
size = 1; /* for extra NUL at the end */
/* If there is no deltaenv to apply, simply return a copy. */
if (!deltaenv || !*deltaenv) {
for (p = wenv; p && *p; ) {
size_t s = wcslen(p) + 1;
size += s;
p += s;
}
ALLOC_ARRAY(result, size);
COPY_ARRAY(result, wenv, size);
FreeEnvironmentStringsW(wenv);
return result;
}
/*
* If there is a deltaenv, let's accumulate all keys into `array`,
* sort them using the stable git_stable_qsort() and then copy,
* skipping duplicate keys
*/
for (p = wenv; p && *p; ) {
ALLOC_GROW(array, nr + 1, alloc);
s = wcslen(p) + 1;
array[nr++] = p;
p += s;
size += s;
}
/* (over-)assess size needed for wchar version of deltaenv */
for (delta_size = 0, i = 0; deltaenv[i]; i++)
delta_size += strlen(deltaenv[i]) * 2 + 1;
ALLOC_ARRAY(wdeltaenv, delta_size);
/* convert the deltaenv, appending to array */
for (i = 0, p = wdeltaenv; deltaenv[i]; i++) {
ALLOC_GROW(array, nr + 1, alloc);
wlen = xutftowcs(p, deltaenv[i], wdeltaenv + delta_size - p);
array[nr++] = p;
p += wlen + 1;
}
git_stable_qsort(array, nr, sizeof(*array), wenvcmp);
ALLOC_ARRAY(result, size + delta_size);
for (p = result, i = 0; i < nr; i++) {
/* Skip any duplicate keys; last one wins */
while (i + 1 < nr && !wenvcmp(array + i, array + i + 1))
i++;
/* Skip "to delete" entry */
if (!wcschr(array[i], L'='))
continue;
size = wcslen(array[i]) + 1;
COPY_ARRAY(p, array[i], size);
p += size;
}
*p = L'\0';
free(array);
free(wdeltaenv);
FreeEnvironmentStringsW(wenv);
return result;
}
static void do_unset_environment_variables(void)
{
static int done;
char *p = unset_environment_variables;
if (done || !p)
return;
done = 1;
for (;;) {
char *comma = strchr(p, ',');
if (comma)
*comma = '\0';
unsetenv(p);
if (!comma)
break;
p = comma + 1;
}
}
struct pinfo_t {
struct pinfo_t *next;
pid_t pid;
HANDLE proc;
};
static struct pinfo_t *pinfo = NULL;
CRITICAL_SECTION pinfo_cs;
/* Used to match and chomp off path components */
static inline int match_last_path_component(const char *path, size_t *len,
const char *component)
{
size_t component_len = strlen(component);
if (*len < component_len + 1 ||
!is_dir_sep(path[*len - component_len - 1]) ||
fspathncmp(path + *len - component_len, component, component_len))
return 0;
*len -= component_len + 1;
/* chomp off repeated dir separators */
while (*len > 0 && is_dir_sep(path[*len - 1]))
(*len)--;
return 1;
}
static int is_msys2_sh(const char *cmd)
{
if (!cmd)
return 0;
if (!strcmp(cmd, "sh")) {
static int ret = -1;
char *p;
if (ret >= 0)
return ret;
p = path_lookup(cmd, 0);
if (!p)
ret = 0;
else {
size_t len = strlen(p);
ret = match_last_path_component(p, &len, "sh.exe") &&
match_last_path_component(p, &len, "bin") &&
match_last_path_component(p, &len, "usr");
free(p);
}
return ret;
}
if (ends_with(cmd, "\\sh.exe")) {
static char *sh;
if (!sh)
sh = path_lookup("sh", 0);
return !fspathcmp(cmd, sh);
}
return 0;
}
static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
const char *dir,
int prepend_cmd, int fhin, int fhout, int fherr)
{
static int restrict_handle_inheritance = -1;
STARTUPINFOEXW si;
PROCESS_INFORMATION pi;
LPPROC_THREAD_ATTRIBUTE_LIST attr_list = NULL;
HANDLE stdhandles[3];
DWORD stdhandles_count = 0;
SIZE_T size;
struct strbuf args;
wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
unsigned flags = CREATE_UNICODE_ENVIRONMENT;
BOOL ret;
HANDLE cons;
const char *(*quote_arg)(const char *arg) =
is_msys2_sh(cmd ? cmd : *argv) ?
quote_arg_msys2 : quote_arg_msvc;
const char *strace_env;
/* Make sure to override previous errors, if any */
errno = 0;
if (restrict_handle_inheritance < 0)
restrict_handle_inheritance = core_restrict_inherited_handles;
/*
* The following code to restrict which handles are inherited seems
* to work properly only on Windows 7 and later, so let's disable it
* on Windows Vista and 2008.
*/
if (restrict_handle_inheritance < 0)
restrict_handle_inheritance = GetVersion() >> 16 >= 7601;
do_unset_environment_variables();
/* Determine whether or not we are associated to a console */
cons = CreateFileW(L"CONOUT$", GENERIC_WRITE,
FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);
if (cons == INVALID_HANDLE_VALUE) {
/* There is no console associated with this process.
* Since the child is a console process, Windows
* would normally create a console window. But
* since we'll be redirecting std streams, we do
* not need the console.
* It is necessary to use DETACHED_PROCESS
* instead of CREATE_NO_WINDOW to make ssh
* recognize that it has no console.
*/
flags |= DETACHED_PROCESS;
} else {
/* There is already a console. If we specified
* DETACHED_PROCESS here, too, Windows would
* disassociate the child from the console.
* The same is true for CREATE_NO_WINDOW.
* Go figure!
*/
CloseHandle(cons);
}
memset(&si, 0, sizeof(si));
si.StartupInfo.cb = sizeof(si);
si.StartupInfo.hStdInput = winansi_get_osfhandle(fhin);
si.StartupInfo.hStdOutput = winansi_get_osfhandle(fhout);
si.StartupInfo.hStdError = winansi_get_osfhandle(fherr);
/* The list of handles cannot contain duplicates */
if (si.StartupInfo.hStdInput != INVALID_HANDLE_VALUE)
stdhandles[stdhandles_count++] = si.StartupInfo.hStdInput;
if (si.StartupInfo.hStdOutput != INVALID_HANDLE_VALUE &&
si.StartupInfo.hStdOutput != si.StartupInfo.hStdInput)
stdhandles[stdhandles_count++] = si.StartupInfo.hStdOutput;
if (si.StartupInfo.hStdError != INVALID_HANDLE_VALUE &&
si.StartupInfo.hStdError != si.StartupInfo.hStdInput &&
si.StartupInfo.hStdError != si.StartupInfo.hStdOutput)
stdhandles[stdhandles_count++] = si.StartupInfo.hStdError;
if (stdhandles_count)
si.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
if (*argv && !strcmp(cmd, *argv))
wcmd[0] = L'\0';
else if (xutftowcs_path(wcmd, cmd) < 0)
return -1;
if (dir && xutftowcs_path(wdir, dir) < 0)
return -1;
/* concatenate argv, quoting args as we go */
strbuf_init(&args, 0);
if (prepend_cmd) {
char *quoted = (char *)quote_arg(cmd);
strbuf_addstr(&args, quoted);
if (quoted != cmd)
free(quoted);
}
for (; *argv; argv++) {
char *quoted = (char *)quote_arg(*argv);
if (*args.buf)
strbuf_addch(&args, ' ');
strbuf_addstr(&args, quoted);
if (quoted != *argv)
free(quoted);
}
strace_env = getenv("GIT_STRACE_COMMANDS");
if (strace_env) {
char *p = path_lookup("strace.exe", 1);
if (!p)
return error("strace not found!");
if (xutftowcs_path(wcmd, p) < 0) {
free(p);
return -1;
}
free(p);
if (!strcmp("1", strace_env) ||
!strcasecmp("yes", strace_env) ||
!strcasecmp("true", strace_env))
strbuf_insert(&args, 0, "strace ", 7);
else {
const char *quoted = quote_arg(strace_env);
struct strbuf buf = STRBUF_INIT;
strbuf_addf(&buf, "strace -o %s ", quoted);
if (quoted != strace_env)
free((char *)quoted);
strbuf_insert(&args, 0, buf.buf, buf.len);
strbuf_release(&buf);
}
}
ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
xutftowcs(wargs, args.buf, 2 * args.len + 1);
strbuf_release(&args);
wenvblk = make_environment_block(deltaenv);
memset(&pi, 0, sizeof(pi));
if (restrict_handle_inheritance && stdhandles_count &&
(InitializeProcThreadAttributeList(NULL, 1, 0, &size) ||
GetLastError() == ERROR_INSUFFICIENT_BUFFER) &&
(attr_list = (LPPROC_THREAD_ATTRIBUTE_LIST)
(HeapAlloc(GetProcessHeap(), 0, size))) &&
InitializeProcThreadAttributeList(attr_list, 1, 0, &size) &&
UpdateProcThreadAttribute(attr_list, 0,
PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
stdhandles,
stdhandles_count * sizeof(HANDLE),
NULL, NULL)) {
si.lpAttributeList = attr_list;
flags |= EXTENDED_STARTUPINFO_PRESENT;
}
ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
stdhandles_count ? TRUE : FALSE,
flags, wenvblk, dir ? wdir : NULL,
&si.StartupInfo, &pi);
/*
* On Windows 2008 R2, it seems that specifying certain types of handles
* (such as FILE_TYPE_CHAR or FILE_TYPE_PIPE) will always produce an
* error. Rather than playing finicky and fragile games, let's just try
* to detect this situation and simply try again without restricting any
* handle inheritance. This is still better than failing to create
* processes.
*/
if (!ret && restrict_handle_inheritance && stdhandles_count) {
DWORD err = GetLastError();
struct strbuf buf = STRBUF_INIT;
if (err != ERROR_NO_SYSTEM_RESOURCES &&
/*
* On Windows 7 and earlier, handles on pipes and character
* devices are inherited automatically, and cannot be
* specified in the thread handle list. Rather than trying
* to catch each and every corner case (and running the
* chance of *still* forgetting a few), let's just fall
* back to creating the process without trying to limit the
* handle inheritance.
*/
!(err == ERROR_INVALID_PARAMETER &&
GetVersion() >> 16 < 9200) &&
!getenv("SUPPRESS_HANDLE_INHERITANCE_WARNING")) {
DWORD fl = 0;
int i;
setenv("SUPPRESS_HANDLE_INHERITANCE_WARNING", "1", 1);
for (i = 0; i < stdhandles_count; i++) {
HANDLE h = stdhandles[i];
strbuf_addf(&buf, "handle #%d: %p (type %lx, "
"handle info (%d) %lx\n", i, h,
GetFileType(h),
GetHandleInformation(h, &fl),
fl);
}
strbuf_addstr(&buf, "\nThis is a bug; please report it "
"at\nhttps://github.com/git-for-windows/"
"git/issues/new\n\n"
"To suppress this warning, please set "
"the environment variable\n\n"
"\tSUPPRESS_HANDLE_INHERITANCE_WARNING=1"
"\n");
}
restrict_handle_inheritance = 0;
flags &= ~EXTENDED_STARTUPINFO_PRESENT;
ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL,
TRUE, flags, wenvblk, dir ? wdir : NULL,
&si.StartupInfo, &pi);
if (!ret)
errno = err_win_to_posix(GetLastError());
if (ret && buf.len) {
warning("failed to restrict file handles (%ld)\n\n%s",
err, buf.buf);
}
strbuf_release(&buf);
} else if (!ret)
errno = err_win_to_posix(GetLastError());
if (si.lpAttributeList)
DeleteProcThreadAttributeList(si.lpAttributeList);
if (attr_list)
HeapFree(GetProcessHeap(), 0, attr_list);
free(wenvblk);
free(wargs);
if (!ret)
return -1;
CloseHandle(pi.hThread);
/*
* The process ID is the human-readable identifier of the process
* that we want to present in log and error messages. The handle
* is not useful for this purpose. But we cannot close it, either,
* because it is not possible to turn a process ID into a process
* handle after the process terminated.
* Keep the handle in a list for waitpid.
*/
EnterCriticalSection(&pinfo_cs);
{
struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
info->pid = pi.dwProcessId;
info->proc = pi.hProcess;
info->next = pinfo;
pinfo = info;
}
LeaveCriticalSection(&pinfo_cs);
return (pid_t)pi.dwProcessId;
}
static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
{
return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
}
pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
const char *dir,
int fhin, int fhout, int fherr)
{
pid_t pid;
char *prog = path_lookup(cmd, 0);
if (!prog) {
errno = ENOENT;
pid = -1;
}
else {
const char *interpr = parse_interpreter(prog);
if (interpr) {
const char *argv0 = argv[0];
char *iprog = path_lookup(interpr, 1);
argv[0] = prog;
if (!iprog) {
errno = ENOENT;
pid = -1;
}
else {
pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
fhin, fhout, fherr);
free(iprog);
}
argv[0] = argv0;
}
else
pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
fhin, fhout, fherr);
free(prog);
}
return pid;
}
static int try_shell_exec(const char *cmd, char *const *argv)
{
const char *interpr = parse_interpreter(cmd);
char *prog;
int pid = 0;
if (!interpr)
return 0;
prog = path_lookup(interpr, 1);
if (prog) {
int exec_id;
int argc = 0;
#ifndef _MSC_VER
const
#endif
char **argv2;
while (argv[argc]) argc++;
ALLOC_ARRAY(argv2, argc + 1);
argv2[0] = (char *)cmd; /* full path to the script file */
COPY_ARRAY(&argv2[1], &argv[1], argc);
exec_id = trace2_exec(prog, argv2);
pid = mingw_spawnv(prog, argv2, 1);
if (pid >= 0) {
int status;
if (waitpid(pid, &status, 0) < 0)
status = 255;
trace2_exec_result(exec_id, status);
exit(status);
}
trace2_exec_result(exec_id, -1);
pid = 1; /* indicate that we tried but failed */
free(prog);
free(argv2);
}
return pid;
}
int mingw_execv(const char *cmd, char *const *argv)
{
/* check if git_command is a shell script */
if (!try_shell_exec(cmd, argv)) {
int pid, status;
int exec_id;
exec_id = trace2_exec(cmd, (const char **)argv);
pid = mingw_spawnv(cmd, (const char **)argv, 0);
if (pid < 0) {
trace2_exec_result(exec_id, -1);
return -1;
}
if (waitpid(pid, &status, 0) < 0)
status = 255;
trace2_exec_result(exec_id, status);
exit(status);
}
return -1;
}
int mingw_execvp(const char *cmd, char *const *argv)
{
char *prog = path_lookup(cmd, 0);
if (prog) {
mingw_execv(prog, argv);
free(prog);
} else
errno = ENOENT;
return -1;
}
int mingw_kill(pid_t pid, int sig)
{
if (pid > 0 && sig == SIGTERM) {
HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
if (TerminateProcess(h, -1)) {
CloseHandle(h);
return 0;
}
errno = err_win_to_posix(GetLastError());
CloseHandle(h);
return -1;
} else if (pid > 0 && sig == 0) {
HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
if (h) {
CloseHandle(h);
return 0;
}
}
errno = EINVAL;
return -1;
}
/*
* UTF-8 versions of getenv(), putenv() and unsetenv().
* Internally, they use the CRT's stock UNICODE routines
* to avoid data loss.
*/
char *mingw_getenv(const char *name)
{
#define GETENV_MAX_RETAIN 64
static char *values[GETENV_MAX_RETAIN];
static int value_counter;
int len_key, len_value;
wchar_t *w_key;
char *value;
wchar_t w_value[32768];
if (!name || !*name)
return NULL;
len_key = strlen(name) + 1;
/* We cannot use xcalloc() here because that uses getenv() itself */
w_key = calloc(len_key, sizeof(wchar_t));
if (!w_key)
die("Out of memory, (tried to allocate %u wchar_t's)", len_key);
xutftowcs(w_key, name, len_key);
/* GetEnvironmentVariableW() only sets the last error upon failure */
SetLastError(ERROR_SUCCESS);
len_value = GetEnvironmentVariableW(w_key, w_value, ARRAY_SIZE(w_value));
if (!len_value && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
free(w_key);
return NULL;
}
free(w_key);
len_value = len_value * 3 + 1;
/* We cannot use xcalloc() here because that uses getenv() itself */
value = calloc(len_value, sizeof(char));
if (!value)
die("Out of memory, (tried to allocate %u bytes)", len_value);
xwcstoutf(value, w_value, len_value);
/*
* We return `value` which is an allocated value and the caller is NOT
* expecting to have to free it, so we keep a round-robin array,
* invalidating the buffer after GETENV_MAX_RETAIN getenv() calls.
*/
free(values[value_counter]);
values[value_counter++] = value;
if (value_counter >= ARRAY_SIZE(values))
value_counter = 0;
return value;
}
int mingw_putenv(const char *namevalue)
{
int size;
wchar_t *wide, *equal;
BOOL result;
if (!namevalue || !*namevalue)
return 0;
size = strlen(namevalue) * 2 + 1;
wide = calloc(size, sizeof(wchar_t));
if (!wide)
die("Out of memory, (tried to allocate %u wchar_t's)", size);
xutftowcs(wide, namevalue, size);
equal = wcschr(wide, L'=');
if (!equal)
result = SetEnvironmentVariableW(wide, NULL);
else {
*equal = L'\0';
result = SetEnvironmentVariableW(wide, equal + 1);
}
free(wide);
if (!result)
errno = err_win_to_posix(GetLastError());
return result ? 0 : -1;
}
static void ensure_socket_initialization(void)
{
WSADATA wsa;
static int initialized = 0;
if (initialized)
return;
if (WSAStartup(MAKEWORD(2,2), &wsa))
die("unable to initialize winsock subsystem, error %d",
WSAGetLastError());
atexit((void(*)(void)) WSACleanup);
initialized = 1;
}
#undef gethostname
int mingw_gethostname(char *name, int namelen)
{
ensure_socket_initialization();
return gethostname(name, namelen);
}
#undef gethostbyname
struct hostent *mingw_gethostbyname(const char *host)
{
ensure_socket_initialization();
return gethostbyname(host);
}
#undef getaddrinfo
int mingw_getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints, struct addrinfo **res)
{
ensure_socket_initialization();
return getaddrinfo(node, service, hints, res);
}
int mingw_socket(int domain, int type, int protocol)
{
int sockfd;
SOCKET s;
ensure_socket_initialization();
s = WSASocket(domain, type, protocol, NULL, 0, 0);
if (s == INVALID_SOCKET) {
/*
* WSAGetLastError() values are regular BSD error codes
* biased by WSABASEERR.
* However, strerror() does not know about networking
* specific errors, which are values beginning at 38 or so.
* Therefore, we choose to leave the biased error code
* in errno so that _if_ someone looks up the code somewhere,
* then it is at least the number that are usually listed.
*/
errno = WSAGetLastError();
return -1;
}
/* convert into a file descriptor */
if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
closesocket(s);
return error("unable to make a socket file descriptor: %s",
strerror(errno));
}
return sockfd;
}
#undef connect
int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return connect(s, sa, sz);
}
#undef bind
int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return bind(s, sa, sz);
}
#undef setsockopt
int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return setsockopt(s, lvl, optname, (const char*)optval, optlen);
}
#undef shutdown
int mingw_shutdown(int sockfd, int how)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return shutdown(s, how);
}
#undef listen
int mingw_listen(int sockfd, int backlog)
{
SOCKET s = (SOCKET)_get_osfhandle(sockfd);
return listen(s, backlog);
}
#undef accept
int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
{
int sockfd2;
SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
SOCKET s2 = accept(s1, sa, sz);
/* convert into a file descriptor */
if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
int err = errno;
closesocket(s2);
return error("unable to make a socket file descriptor: %s",
strerror(err));
}
return sockfd2;
}
#undef rename
int mingw_rename(const char *pold, const char *pnew)
{
DWORD attrs, gle;
int tries = 0;
wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
return -1;
/*
* Try native rename() first to get errno right.
* It is based on MoveFile(), which cannot overwrite existing files.
*/
if (!_wrename(wpold, wpnew))
return 0;
if (errno != EEXIST)
return -1;
repeat:
if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
return 0;
/* TODO: translate more errors */
gle = GetLastError();
if (gle == ERROR_ACCESS_DENIED &&
(attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
DWORD attrsold = GetFileAttributesW(wpold);
if (attrsold == INVALID_FILE_ATTRIBUTES ||
!(attrsold & FILE_ATTRIBUTE_DIRECTORY))
errno = EISDIR;
else if (!_wrmdir(wpnew))
goto repeat;
return -1;
}
if ((attrs & FILE_ATTRIBUTE_READONLY) &&
SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
return 0;
gle = GetLastError();
/* revert file attributes on failure */
SetFileAttributesW(wpnew, attrs);
}
}
if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
/*
* We assume that some other process had the source or
* destination file open at the wrong moment and retry.
* In order to give the other process a higher chance to
* complete its operation, we give up our time slice now.
* If we have to retry again, we do sleep a bit.
*/
Sleep(delay[tries]);
tries++;
goto repeat;
}
if (gle == ERROR_ACCESS_DENIED &&
ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
"Should I try again?", pold, pnew))
goto repeat;
errno = EACCES;
return -1;
}
/*
* Note that this doesn't return the actual pagesize, but
* the allocation granularity. If future Windows specific git code
* needs the real getpagesize function, we need to find another solution.
*/
int mingw_getpagesize(void)
{
SYSTEM_INFO si;
GetSystemInfo(&si);
return si.dwAllocationGranularity;
}
/* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
enum EXTENDED_NAME_FORMAT {
NameDisplay = 3,
NameUserPrincipal = 8
};
static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
{
DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
static wchar_t wbuffer[1024];
DWORD len;
if (!INIT_PROC_ADDR(GetUserNameExW))
return NULL;
len = ARRAY_SIZE(wbuffer);
if (GetUserNameExW(type, wbuffer, &len)) {
char *converted = xmalloc((len *= 3));
if (xwcstoutf(converted, wbuffer, len) >= 0)
return converted;
free(converted);
}
return NULL;
}
char *mingw_query_user_email(void)
{
return get_extended_user_info(NameUserPrincipal);
}
struct passwd *getpwuid(int uid)
{
static unsigned initialized;
static char user_name[100];
static struct passwd *p;
wchar_t buf[100];
DWORD len;
if (initialized)
return p;
len = ARRAY_SIZE(buf);
if (!GetUserNameW(buf, &len)) {
initialized = 1;
return NULL;
}
if (xwcstoutf(user_name, buf, sizeof(user_name)) < 0) {
initialized = 1;
return NULL;
}
p = xmalloc(sizeof(*p));
p->pw_name = user_name;
p->pw_gecos = get_extended_user_info(NameDisplay);
if (!p->pw_gecos)
p->pw_gecos = "unknown";
p->pw_dir = NULL;
initialized = 1;
return p;
}
static HANDLE timer_event;
static HANDLE timer_thread;
static int timer_interval;
static int one_shot;
static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
/* The timer works like this:
* The thread, ticktack(), is a trivial routine that most of the time
* only waits to receive the signal to terminate. The main thread tells
* the thread to terminate by setting the timer_event to the signalled
* state.
* But ticktack() interrupts the wait state after the timer's interval
* length to call the signal handler.
*/
static unsigned __stdcall ticktack(void *dummy)
{
while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
mingw_raise(SIGALRM);
if (one_shot)
break;
}
return 0;
}
static int start_timer_thread(void)
{
timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (timer_event) {
timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
if (!timer_thread )
return errno = ENOMEM,
error("cannot start timer thread");
} else
return errno = ENOMEM,
error("cannot allocate resources for timer");
return 0;
}
static void stop_timer_thread(void)
{
if (timer_event)
SetEvent(timer_event); /* tell thread to terminate */
if (timer_thread) {
int rc = WaitForSingleObject(timer_thread, 10000);
if (rc == WAIT_TIMEOUT)
error("timer thread did not terminate timely");
else if (rc != WAIT_OBJECT_0)
error("waiting for timer thread failed: %lu",
GetLastError());
CloseHandle(timer_thread);
}
if (timer_event)
CloseHandle(timer_event);
timer_event = NULL;
timer_thread = NULL;
}
static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
{
return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
}
int setitimer(int type, struct itimerval *in, struct itimerval *out)
{
static const struct timeval zero;
static int atexit_done;
if (out != NULL)
return errno = EINVAL,
error("setitimer param 3 != NULL not implemented");
if (!is_timeval_eq(&in->it_interval, &zero) &&
!is_timeval_eq(&in->it_interval, &in->it_value))
return errno = EINVAL,
error("setitimer: it_interval must be zero or eq it_value");
if (timer_thread)
stop_timer_thread();
if (is_timeval_eq(&in->it_value, &zero) &&
is_timeval_eq(&in->it_interval, &zero))
return 0;
timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
one_shot = is_timeval_eq(&in->it_interval, &zero);
if (!atexit_done) {
atexit(stop_timer_thread);
atexit_done = 1;
}
return start_timer_thread();
}
int sigaction(int sig, struct sigaction *in, struct sigaction *out)
{
if (sig != SIGALRM)
return errno = EINVAL,
error("sigaction only implemented for SIGALRM");
if (out != NULL)
return errno = EINVAL,
error("sigaction: param 3 != NULL not implemented");
timer_fn = in->sa_handler;
return 0;
}
#undef signal
sig_handler_t mingw_signal(int sig, sig_handler_t handler)
{
sig_handler_t old;
switch (sig) {
case SIGALRM:
old = timer_fn;
timer_fn = handler;
break;
case SIGINT:
old = sigint_fn;
sigint_fn = handler;
break;
default:
return signal(sig, handler);
}
return old;
}
#undef raise
int mingw_raise(int sig)
{
switch (sig) {
case SIGALRM:
if (timer_fn == SIG_DFL) {
if (isatty(STDERR_FILENO))
fputs("Alarm clock\n", stderr);
exit(128 + SIGALRM);
} else if (timer_fn != SIG_IGN)
timer_fn(SIGALRM);
return 0;
case SIGINT:
if (sigint_fn == SIG_DFL)
exit(128 + SIGINT);
else if (sigint_fn != SIG_IGN)
sigint_fn(SIGINT);
return 0;
#if defined(_MSC_VER)
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGTERM:
case SIGBREAK:
case SIGABRT:
case SIGABRT_COMPAT:
/*
* The <signal.h> header in the MS C Runtime defines 8 signals
* as being supported on the platform. Anything else causes an
* "Invalid signal or error" (which in DEBUG builds causes the
* Abort/Retry/Ignore dialog). We by-pass the CRT for things we
* already know will fail.
*/
return raise(sig);
default:
errno = EINVAL;
return -1;
#else
default:
return raise(sig);
#endif
}
}
int link(const char *oldpath, const char *newpath)
{
wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
if (xutftowcs_path(woldpath, oldpath) < 0 ||
xutftowcs_path(wnewpath, newpath) < 0)
return -1;
if (!CreateHardLinkW(wnewpath, woldpath, NULL)) {
errno = err_win_to_posix(GetLastError());
return -1;
}
return 0;
}
pid_t waitpid(pid_t pid, int *status, int options)
{
HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
FALSE, pid);
if (!h) {
errno = ECHILD;
return -1;
}
if (pid > 0 && options & WNOHANG) {
if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
CloseHandle(h);
return 0;
}
options &= ~WNOHANG;
}
if (options == 0) {
struct pinfo_t **ppinfo;
if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
CloseHandle(h);
return 0;
}
if (status)
GetExitCodeProcess(h, (LPDWORD)status);
EnterCriticalSection(&pinfo_cs);
ppinfo = &pinfo;
while (*ppinfo) {
struct pinfo_t *info = *ppinfo;
if (info->pid == pid) {
CloseHandle(info->proc);
*ppinfo = info->next;
free(info);
break;
}
ppinfo = &info->next;
}
LeaveCriticalSection(&pinfo_cs);
CloseHandle(h);
return pid;
}
CloseHandle(h);
errno = EINVAL;
return -1;
}
int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
{
int upos = 0, wpos = 0;
const unsigned char *utf = (const unsigned char*) utfs;
if (!utf || !wcs || wcslen < 1) {
errno = EINVAL;
return -1;
}
/* reserve space for \0 */
wcslen--;
if (utflen < 0)
utflen = INT_MAX;
while (upos < utflen) {
int c = utf[upos++] & 0xff;
if (utflen == INT_MAX && c == 0)
break;
if (wpos >= wcslen) {
wcs[wpos] = 0;
errno = ERANGE;
return -1;
}
if (c < 0x80) {
/* ASCII */
wcs[wpos++] = c;
} else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
(utf[upos] & 0xc0) == 0x80) {
/* 2-byte utf-8 */
c = ((c & 0x1f) << 6);
c |= (utf[upos++] & 0x3f);
wcs[wpos++] = c;
} else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
!(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
(utf[upos] & 0xc0) == 0x80 &&
(utf[upos + 1] & 0xc0) == 0x80) {
/* 3-byte utf-8 */
c = ((c & 0x0f) << 12);
c |= ((utf[upos++] & 0x3f) << 6);
c |= (utf[upos++] & 0x3f);
wcs[wpos++] = c;
} else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
wpos + 1 < wcslen &&
!(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
!(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
(utf[upos] & 0xc0) == 0x80 &&
(utf[upos + 1] & 0xc0) == 0x80 &&
(utf[upos + 2] & 0xc0) == 0x80) {
/* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
c = ((c & 0x07) << 18);
c |= ((utf[upos++] & 0x3f) << 12);
c |= ((utf[upos++] & 0x3f) << 6);
c |= (utf[upos++] & 0x3f);
c -= 0x10000;
wcs[wpos++] = 0xd800 | (c >> 10);
wcs[wpos++] = 0xdc00 | (c & 0x3ff);
} else if (c >= 0xa0) {
/* invalid utf-8 byte, printable unicode char: convert 1:1 */
wcs[wpos++] = c;
} else {
/* invalid utf-8 byte, non-printable unicode: convert to hex */
static const char *hex = "0123456789abcdef";
wcs[wpos++] = hex[c >> 4];
if (wpos < wcslen)
wcs[wpos++] = hex[c & 0x0f];
}
}
wcs[wpos] = 0;
return wpos;
}
int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
{
if (!wcs || !utf || utflen < 1) {
errno = EINVAL;
return -1;
}
utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
if (utflen)
return utflen - 1;
errno = ERANGE;
return -1;
}
static void setup_windows_environment(void)
{
char *tmp = getenv("TMPDIR");
/* on Windows it is TMP and TEMP */
if (!tmp) {
if (!(tmp = getenv("TMP")))
tmp = getenv("TEMP");
if (tmp) {
setenv("TMPDIR", tmp, 1);
tmp = getenv("TMPDIR");
}
}
if (tmp) {
/*
* Convert all dir separators to forward slashes,
* to help shell commands called from the Git
* executable (by not mistaking the dir separators
* for escape characters).
*/
convert_slashes(tmp);
}
/* simulate TERM to enable auto-color (see color.c) */
if (!getenv("TERM"))
setenv("TERM", "cygwin", 1);
/* calculate HOME if not set */
if (!getenv("HOME")) {
/*
* try $HOMEDRIVE$HOMEPATH - the home share may be a network
* location, thus also check if the path exists (i.e. is not
* disconnected)
*/
if ((tmp = getenv("HOMEDRIVE"))) {
struct strbuf buf = STRBUF_INIT;
strbuf_addstr(&buf, tmp);
if ((tmp = getenv("HOMEPATH"))) {
strbuf_addstr(&buf, tmp);
if (is_directory(buf.buf))
setenv("HOME", buf.buf, 1);
else
tmp = NULL; /* use $USERPROFILE */
}
strbuf_release(&buf);
}
/* use $USERPROFILE if the home share is not available */
if (!tmp && (tmp = getenv("USERPROFILE")))
setenv("HOME", tmp, 1);
}
}
int is_valid_win32_path(const char *path, int allow_literal_nul)
{
const char *p = path;
int preceding_space_or_period = 0, i = 0, periods = 0;
if (!protect_ntfs)
return 1;
skip_dos_drive_prefix((char **)&path);
goto segment_start;
for (;;) {
char c = *(path++);
switch (c) {
case '\0':
case '/': case '\\':
/* cannot end in ` ` or `.`, except for `.` and `..` */
if (preceding_space_or_period &&
(i != periods || periods > 2))
return 0;
if (!c)
return 1;
i = periods = preceding_space_or_period = 0;
segment_start:
switch (*path) {
case 'a': case 'A': /* AUX */
if (((c = path[++i]) != 'u' && c != 'U') ||
((c = path[++i]) != 'x' && c != 'X')) {
not_a_reserved_name:
path += i;
continue;
}
break;
case 'c': case 'C':
/* COM1 ... COM9, CON, CONIN$, CONOUT$ */
if ((c = path[++i]) != 'o' && c != 'O')
goto not_a_reserved_name;
c = path[++i];
if (c == 'm' || c == 'M') { /* COM1 ... COM9 */
c = path[++i];
if (c < '1' || c > '9')
goto not_a_reserved_name;
} else if (c == 'n' || c == 'N') { /* CON */
c = path[i + 1];
if ((c == 'i' || c == 'I') &&
((c = path[i + 2]) == 'n' ||
c == 'N') &&
path[i + 3] == '$')
i += 3; /* CONIN$ */
else if ((c == 'o' || c == 'O') &&
((c = path[i + 2]) == 'u' ||
c == 'U') &&
((c = path[i + 3]) == 't' ||
c == 'T') &&
path[i + 4] == '$')
i += 4; /* CONOUT$ */
} else
goto not_a_reserved_name;
break;
case 'l': case 'L': /* LPT<N> */
if (((c = path[++i]) != 'p' && c != 'P') ||
((c = path[++i]) != 't' && c != 'T') ||
!isdigit(path[++i]))
goto not_a_reserved_name;
break;
case 'n': case 'N': /* NUL */
if (((c = path[++i]) != 'u' && c != 'U') ||
((c = path[++i]) != 'l' && c != 'L') ||
(allow_literal_nul &&
!path[i + 1] && p == path))
goto not_a_reserved_name;
break;
case 'p': case 'P': /* PRN */
if (((c = path[++i]) != 'r' && c != 'R') ||
((c = path[++i]) != 'n' && c != 'N'))
goto not_a_reserved_name;
break;
default:
continue;
}
/*
* So far, this looks like a reserved name. Let's see
* whether it actually is one: trailing spaces, a file
* extension, or an NTFS Alternate Data Stream do not
* matter, the name is still reserved if any of those
* follow immediately after the actual name.
*/
i++;
if (path[i] == ' ') {
preceding_space_or_period = 1;
while (path[++i] == ' ')
; /* skip all spaces */
}
c = path[i];
if (c && c != '.' && c != ':' && c != '/' && c != '\\')
goto not_a_reserved_name;
/* contains reserved name */
return 0;
case '.':
periods++;
/* fallthru */
case ' ':
preceding_space_or_period = 1;
i++;
continue;
case ':': /* DOS drive prefix was already skipped */
case '<': case '>': case '"': case '|': case '?': case '*':
/* illegal character */
return 0;
default:
if (c > '\0' && c < '\x20')
/* illegal character */
return 0;
}
preceding_space_or_period = 0;
i++;
}
}
#if !defined(_MSC_VER)
/*
* Disable MSVCRT command line wildcard expansion (__getmainargs called from
* mingw startup code, see init.c in mingw runtime).
*/
int _CRT_glob = 0;
#endif
static NORETURN void die_startup(void)
{
fputs("fatal: not enough memory for initialization", stderr);
exit(128);
}
static void *malloc_startup(size_t size)
{
void *result = malloc(size);
if (!result)
die_startup();
return result;
}
static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
{
len = xwcstoutf(buffer, wcs, len) + 1;
return memcpy(malloc_startup(len), buffer, len);
}
static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
DWORD desired_access, DWORD flags)
{
DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
wchar_t buf[MAX_PATH];
DWORD max = ARRAY_SIZE(buf);
HANDLE handle;
DWORD ret = GetEnvironmentVariableW(key, buf, max);
if (!ret || ret >= max)
return;
/* make sure this does not leak into child processes */
SetEnvironmentVariableW(key, NULL);
if (!wcscmp(buf, L"off")) {
close(fd);
handle = GetStdHandle(std_id);
if (handle != INVALID_HANDLE_VALUE)
CloseHandle(handle);
return;
}
if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
handle = GetStdHandle(STD_OUTPUT_HANDLE);
if (handle == INVALID_HANDLE_VALUE) {
close(fd);
handle = GetStdHandle(std_id);
if (handle != INVALID_HANDLE_VALUE)
CloseHandle(handle);
} else {
int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
SetStdHandle(std_id, handle);
dup2(new_fd, fd);
/* do *not* close the new_fd: that would close stdout */
}
return;
}
handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
flags, NULL);
if (handle != INVALID_HANDLE_VALUE) {
int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
SetStdHandle(std_id, handle);
dup2(new_fd, fd);
close(new_fd);
}
}
static void maybe_redirect_std_handles(void)
{
maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
}
#ifdef _MSC_VER
#ifdef _DEBUG
#include <crtdbg.h>
#endif
#endif
/*
* We implement wmain() and compile with -municode, which would
* normally ignore main(), but we call the latter from the former
* so that we can handle non-ASCII command-line parameters
* appropriately.
*
* To be more compatible with the core git code, we convert
* argv into UTF8 and pass them directly to main().
*/
int wmain(int argc, const wchar_t **wargv)
{
int i, maxlen, exit_status;
char *buffer, **save;
const char **argv;
trace2_initialize_clock();
#ifdef _MSC_VER
#ifdef _DEBUG
_CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_DEBUG);
#endif
#ifdef USE_MSVC_CRTDBG
_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
#endif
#endif
maybe_redirect_std_handles();
/* determine size of argv and environ conversion buffer */
maxlen = wcslen(wargv[0]);
for (i = 1; i < argc; i++)
maxlen = max(maxlen, wcslen(wargv[i]));
/* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
maxlen = 3 * maxlen + 1;
buffer = malloc_startup(maxlen);
/*
* Create a UTF-8 version of w_argv. Also create a "save" copy
* to remember all the string pointers because parse_options()
* will remove claimed items from the argv that we pass down.
*/
ALLOC_ARRAY(argv, argc + 1);
ALLOC_ARRAY(save, argc + 1);
for (i = 0; i < argc; i++)
argv[i] = save[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
argv[i] = save[i] = NULL;
free(buffer);
/* fix Windows specific environment settings */
setup_windows_environment();
unset_environment_variables = xstrdup("PERL5LIB");
/* initialize critical section for waitpid pinfo_t list */
InitializeCriticalSection(&pinfo_cs);
/* set up default file mode and file modes for stdin/out/err */
_fmode = _O_BINARY;
_setmode(_fileno(stdin), _O_BINARY);
_setmode(_fileno(stdout), _O_BINARY);
_setmode(_fileno(stderr), _O_BINARY);
/* initialize Unicode console */
winansi_init();
/* invoke the real main() using our utf8 version of argv. */
exit_status = main(argc, argv);
for (i = 0; i < argc; i++)
free(save[i]);
free(save);
free(argv);
return exit_status;
}
int uname(struct utsname *buf)
{
unsigned v = (unsigned)GetVersion();
memset(buf, 0, sizeof(*buf));
xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
xsnprintf(buf->release, sizeof(buf->release),
"%u.%u", v & 0xff, (v >> 8) & 0xff);
/* assuming NT variants only.. */
xsnprintf(buf->version, sizeof(buf->version),
"%u", (v >> 16) & 0x7fff);
return 0;
}
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