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![Junio C Hamano](/assets/img/avatar_default.png)
* np/malloc-threading: Thread-safe xmalloc and xrealloc needs a recursive mutex Make xmalloc and xrealloc thread-safe
353 lines
7.2 KiB
C
353 lines
7.2 KiB
C
/*
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* Various trivial helper wrappers around standard functions
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*/
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#include "cache.h"
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static void try_to_free_builtin(size_t size)
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{
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release_pack_memory(size, -1);
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}
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static void (*try_to_free_routine)(size_t size) = try_to_free_builtin;
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void set_try_to_free_routine(void (*routine)(size_t))
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{
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try_to_free_routine = (routine) ? routine : try_to_free_builtin;
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}
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char *xstrdup(const char *str)
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{
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char *ret = strdup(str);
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if (!ret) {
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try_to_free_routine(strlen(str) + 1);
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ret = strdup(str);
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if (!ret)
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die("Out of memory, strdup failed");
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}
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return ret;
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}
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void *xmalloc(size_t size)
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{
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void *ret = malloc(size);
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if (!ret && !size)
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ret = malloc(1);
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if (!ret) {
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try_to_free_routine(size);
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ret = malloc(size);
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if (!ret && !size)
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ret = malloc(1);
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if (!ret)
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die("Out of memory, malloc failed");
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}
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#ifdef XMALLOC_POISON
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memset(ret, 0xA5, size);
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#endif
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return ret;
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}
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void *xmallocz(size_t size)
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{
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void *ret;
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if (size + 1 < size)
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die("Data too large to fit into virtual memory space.");
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ret = xmalloc(size + 1);
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((char*)ret)[size] = 0;
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return ret;
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}
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/*
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* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
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* "data" to the allocated memory, zero terminates the allocated memory,
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* and returns a pointer to the allocated memory. If the allocation fails,
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* the program dies.
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*/
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void *xmemdupz(const void *data, size_t len)
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{
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return memcpy(xmallocz(len), data, len);
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}
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char *xstrndup(const char *str, size_t len)
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{
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char *p = memchr(str, '\0', len);
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return xmemdupz(str, p ? p - str : len);
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}
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void *xrealloc(void *ptr, size_t size)
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{
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void *ret = realloc(ptr, size);
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if (!ret && !size)
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ret = realloc(ptr, 1);
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if (!ret) {
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try_to_free_routine(size);
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ret = realloc(ptr, size);
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if (!ret && !size)
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ret = realloc(ptr, 1);
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if (!ret)
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die("Out of memory, realloc failed");
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}
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return ret;
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}
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void *xcalloc(size_t nmemb, size_t size)
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{
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void *ret = calloc(nmemb, size);
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if (!ret && (!nmemb || !size))
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ret = calloc(1, 1);
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if (!ret) {
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try_to_free_routine(nmemb * size);
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ret = calloc(nmemb, size);
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if (!ret && (!nmemb || !size))
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ret = calloc(1, 1);
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if (!ret)
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die("Out of memory, calloc failed");
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}
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return ret;
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}
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void *xmmap(void *start, size_t length,
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int prot, int flags, int fd, off_t offset)
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{
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void *ret = mmap(start, length, prot, flags, fd, offset);
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if (ret == MAP_FAILED) {
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if (!length)
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return NULL;
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release_pack_memory(length, fd);
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ret = mmap(start, length, prot, flags, fd, offset);
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if (ret == MAP_FAILED)
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die_errno("Out of memory? mmap failed");
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}
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return ret;
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}
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/*
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* xread() is the same a read(), but it automatically restarts read()
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* operations with a recoverable error (EAGAIN and EINTR). xread()
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* DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
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*/
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ssize_t xread(int fd, void *buf, size_t len)
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{
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ssize_t nr;
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while (1) {
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nr = read(fd, buf, len);
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if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
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continue;
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return nr;
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}
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}
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/*
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* xwrite() is the same a write(), but it automatically restarts write()
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* operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
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* GUARANTEE that "len" bytes is written even if the operation is successful.
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*/
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ssize_t xwrite(int fd, const void *buf, size_t len)
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{
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ssize_t nr;
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while (1) {
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nr = write(fd, buf, len);
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if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
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continue;
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return nr;
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}
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}
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ssize_t read_in_full(int fd, void *buf, size_t count)
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{
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char *p = buf;
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ssize_t total = 0;
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while (count > 0) {
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ssize_t loaded = xread(fd, p, count);
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if (loaded <= 0)
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return total ? total : loaded;
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count -= loaded;
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p += loaded;
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total += loaded;
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}
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return total;
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}
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ssize_t write_in_full(int fd, const void *buf, size_t count)
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{
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const char *p = buf;
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ssize_t total = 0;
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while (count > 0) {
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ssize_t written = xwrite(fd, p, count);
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if (written < 0)
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return -1;
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if (!written) {
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errno = ENOSPC;
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return -1;
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}
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count -= written;
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p += written;
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total += written;
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}
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return total;
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}
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int xdup(int fd)
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{
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int ret = dup(fd);
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if (ret < 0)
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die_errno("dup failed");
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return ret;
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}
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FILE *xfdopen(int fd, const char *mode)
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{
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FILE *stream = fdopen(fd, mode);
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if (stream == NULL)
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die_errno("Out of memory? fdopen failed");
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return stream;
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}
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int xmkstemp(char *template)
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{
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int fd;
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fd = mkstemp(template);
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if (fd < 0)
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die_errno("Unable to create temporary file");
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return fd;
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}
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int xmkstemp_mode(char *template, int mode)
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{
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int fd;
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fd = git_mkstemp_mode(template, mode);
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if (fd < 0)
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die_errno("Unable to create temporary file");
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return fd;
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}
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/*
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* zlib wrappers to make sure we don't silently miss errors
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* at init time.
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*/
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void git_inflate_init(z_streamp strm)
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{
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const char *err;
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switch (inflateInit(strm)) {
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case Z_OK:
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return;
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case Z_MEM_ERROR:
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err = "out of memory";
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break;
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case Z_VERSION_ERROR:
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err = "wrong version";
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break;
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default:
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err = "error";
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}
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die("inflateInit: %s (%s)", err, strm->msg ? strm->msg : "no message");
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}
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void git_inflate_end(z_streamp strm)
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{
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if (inflateEnd(strm) != Z_OK)
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error("inflateEnd: %s", strm->msg ? strm->msg : "failed");
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}
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int git_inflate(z_streamp strm, int flush)
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{
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int ret = inflate(strm, flush);
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const char *err;
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switch (ret) {
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/* Out of memory is fatal. */
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case Z_MEM_ERROR:
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die("inflate: out of memory");
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/* Data corruption errors: we may want to recover from them (fsck) */
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case Z_NEED_DICT:
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err = "needs dictionary"; break;
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case Z_DATA_ERROR:
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err = "data stream error"; break;
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case Z_STREAM_ERROR:
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err = "stream consistency error"; break;
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default:
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err = "unknown error"; break;
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/* Z_BUF_ERROR: normal, needs more space in the output buffer */
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case Z_BUF_ERROR:
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case Z_OK:
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case Z_STREAM_END:
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return ret;
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}
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error("inflate: %s (%s)", err, strm->msg ? strm->msg : "no message");
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return ret;
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}
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int odb_mkstemp(char *template, size_t limit, const char *pattern)
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{
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int fd;
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/*
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* we let the umask do its job, don't try to be more
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* restrictive except to remove write permission.
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*/
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int mode = 0444;
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snprintf(template, limit, "%s/%s",
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get_object_directory(), pattern);
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fd = git_mkstemp_mode(template, mode);
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if (0 <= fd)
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return fd;
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/* slow path */
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/* some mkstemp implementations erase template on failure */
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snprintf(template, limit, "%s/%s",
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get_object_directory(), pattern);
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safe_create_leading_directories(template);
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return xmkstemp_mode(template, mode);
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}
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int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
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{
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int fd;
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snprintf(name, namesz, "%s/pack/pack-%s.keep",
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get_object_directory(), sha1_to_hex(sha1));
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fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
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if (0 <= fd)
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return fd;
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/* slow path */
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safe_create_leading_directories(name);
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return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
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}
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static int warn_if_unremovable(const char *op, const char *file, int rc)
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{
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if (rc < 0) {
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int err = errno;
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if (ENOENT != err) {
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warning("unable to %s %s: %s",
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op, file, strerror(errno));
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errno = err;
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}
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}
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return rc;
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}
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int unlink_or_warn(const char *file)
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{
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return warn_if_unremovable("unlink", file, unlink(file));
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}
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int rmdir_or_warn(const char *file)
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{
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return warn_if_unremovable("rmdir", file, rmdir(file));
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}
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int remove_or_warn(unsigned int mode, const char *file)
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{
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return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
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}
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