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wine/scheduler/client.c
Alexandre Julliard 4144b5b8fc Create the server directory and socket file in /tmp. 
Use fcntl file locking to ensure exclusion on the server socket and to
better recover from crashes.
Flush the registry before closing the socket to avoid timeouts on the
client side.
Moved get_config_dir functionality to libwine.
2002-06-20 23:21:27 +00:00

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/*
* Client part of the client/server communication
*
* Copyright (C) 1998 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <sys/un.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdarg.h>
#include "thread.h"
#include "wine/library.h"
#include "wine/server.h"
#include "winerror.h"
#include "options.h"
/* Some versions of glibc don't define this */
#ifndef SCM_RIGHTS
#define SCM_RIGHTS 1
#endif
#define SOCKETNAME "socket" /* name of the socket file */
#define LOCKNAME "lock" /* name of the lock file */
#ifndef HAVE_MSGHDR_ACCRIGHTS
/* data structure used to pass an fd with sendmsg/recvmsg */
struct cmsg_fd
{
int len; /* sizeof structure */
int level; /* SOL_SOCKET */
int type; /* SCM_RIGHTS */
int fd; /* fd to pass */
};
#endif /* HAVE_MSGHDR_ACCRIGHTS */
static void *boot_thread_id;
static sigset_t block_set; /* signals to block during server calls */
static int fd_socket; /* socket to exchange file descriptors with the server */
#ifdef __GNUC__
static void fatal_error( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
static void fatal_perror( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
static void server_connect_error( const char *serverdir ) __attribute__((noreturn));
#endif
/* die on a fatal error; use only during initialization */
static void fatal_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine: " );
vfprintf( stderr, err, args );
va_end( args );
exit(1);
}
/* die on a fatal error; use only during initialization */
static void fatal_perror( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine: " );
vfprintf( stderr, err, args );
perror( " " );
va_end( args );
exit(1);
}
/***********************************************************************
* server_protocol_error
*/
void server_protocol_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine client error:%p: ", NtCurrentTeb()->tid );
vfprintf( stderr, err, args );
va_end( args );
SYSDEPS_AbortThread(1);
}
/***********************************************************************
* server_protocol_perror
*/
void server_protocol_perror( const char *err )
{
fprintf( stderr, "wine client error:%p: ", NtCurrentTeb()->tid );
perror( err );
SYSDEPS_AbortThread(1);
}
/***********************************************************************
* send_request
*
* Send a request to the server.
*/
static void send_request( const struct __server_request_info *req )
{
int i, ret;
if (!req->u.req.request_header.request_size)
{
if ((ret = write( NtCurrentTeb()->request_fd, &req->u.req,
sizeof(req->u.req) )) == sizeof(req->u.req)) return;
}
else
{
struct iovec vec[__SERVER_MAX_DATA+1];
vec[0].iov_base = (void *)&req->u.req;
vec[0].iov_len = sizeof(req->u.req);
for (i = 0; i < req->data_count; i++)
{
vec[i+1].iov_base = (void *)req->data[i].ptr;
vec[i+1].iov_len = req->data[i].size;
}
if ((ret = writev( NtCurrentTeb()->request_fd, vec, i+1 )) ==
req->u.req.request_header.request_size + sizeof(req->u.req)) return;
}
if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
if (errno == EPIPE) SYSDEPS_AbortThread(0);
server_protocol_perror( "sendmsg" );
}
/***********************************************************************
* read_reply_data
*
* Read data from the reply buffer; helper for wait_reply.
*/
static void read_reply_data( void *buffer, size_t size )
{
int ret;
for (;;)
{
if ((ret = read( NtCurrentTeb()->reply_fd, buffer, size )) > 0)
{
if (!(size -= ret)) return;
buffer = (char *)buffer + ret;
continue;
}
if (!ret) break;
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_protocol_perror("read");
}
/* the server closed the connection; time to die... */
SYSDEPS_AbortThread(0);
}
/***********************************************************************
* wait_reply
*
* Wait for a reply from the server.
*/
inline static void wait_reply( struct __server_request_info *req )
{
read_reply_data( &req->u.reply, sizeof(req->u.reply) );
if (req->u.reply.reply_header.reply_size)
read_reply_data( req->reply_data, req->u.reply.reply_header.reply_size );
}
/***********************************************************************
* wine_server_call (NTDLL.@)
*
* Perform a server call.
*/
unsigned int wine_server_call( void *req_ptr )
{
struct __server_request_info * const req = req_ptr;
sigset_t old_set;
memset( (char *)&req->u.req + req->size, 0, sizeof(req->u.req) - req->size );
sigprocmask( SIG_BLOCK, &block_set, &old_set );
send_request( req );
wait_reply( req );
sigprocmask( SIG_SETMASK, &old_set, NULL );
return req->u.reply.reply_header.error;
}
/***********************************************************************
* wine_server_send_fd
*
* Send a file descriptor to the server.
*/
void wine_server_send_fd( int fd )
{
#ifndef HAVE_MSGHDR_ACCRIGHTS
struct cmsg_fd cmsg;
#endif
struct send_fd data;
struct msghdr msghdr;
struct iovec vec;
int ret;
vec.iov_base = (void *)&data;
vec.iov_len = sizeof(data);
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
#ifdef HAVE_MSGHDR_ACCRIGHTS
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_MSGHDR_ACCRIGHTS */
cmsg.len = sizeof(cmsg);
cmsg.level = SOL_SOCKET;
cmsg.type = SCM_RIGHTS;
cmsg.fd = fd;
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
msghdr.msg_flags = 0;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
data.tid = (void *)GetCurrentThreadId();
data.fd = fd;
for (;;)
{
if ((ret = sendmsg( fd_socket, &msghdr, 0 )) == sizeof(data)) return;
if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
if (errno == EINTR) continue;
if (errno == EPIPE) SYSDEPS_AbortThread(0);
server_protocol_perror( "sendmsg" );
}
}
/***********************************************************************
* receive_fd
*
* Receive a file descriptor passed from the server.
*/
static int receive_fd( obj_handle_t *handle )
{
struct iovec vec;
int ret, fd;
#ifdef HAVE_MSGHDR_ACCRIGHTS
struct msghdr msghdr;
fd = -1;
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_MSGHDR_ACCRIGHTS */
struct msghdr msghdr;
struct cmsg_fd cmsg;
cmsg.len = sizeof(cmsg);
cmsg.level = SOL_SOCKET;
cmsg.type = SCM_RIGHTS;
cmsg.fd = -1;
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
msghdr.msg_flags = 0;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
vec.iov_base = (void *)handle;
vec.iov_len = sizeof(*handle);
for (;;)
{
if ((ret = recvmsg( fd_socket, &msghdr, 0 )) > 0)
{
#ifndef HAVE_MSGHDR_ACCRIGHTS
fd = cmsg.fd;
#endif
if (fd == -1) server_protocol_error( "no fd received for handle %d\n", *handle );
fcntl( fd, F_SETFD, 1 ); /* set close on exec flag */
return fd;
}
if (!ret) break;
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_protocol_perror("recvmsg");
}
/* the server closed the connection; time to die... */
SYSDEPS_AbortThread(0);
}
/***********************************************************************
* store_cached_fd
*
* Store the cached fd value for a given handle back into the server.
* Returns the new fd, which can be different if there was already an
* fd in the cache for that handle.
*/
inline static int store_cached_fd( int fd, obj_handle_t handle )
{
SERVER_START_REQ( set_handle_info )
{
req->handle = handle;
req->flags = 0;
req->mask = 0;
req->fd = fd;
if (!wine_server_call( req ))
{
if (reply->cur_fd != fd)
{
/* someone was here before us */
close( fd );
fd = reply->cur_fd;
}
}
else
{
close( fd );
fd = -1;
}
}
SERVER_END_REQ;
return fd;
}
/***********************************************************************
* wine_server_fd_to_handle (NTDLL.@)
*
* Allocate a file handle for a Unix fd.
*/
int wine_server_fd_to_handle( int fd, unsigned int access, int inherit, obj_handle_t *handle )
{
int ret;
*handle = 0;
wine_server_send_fd( fd );
SERVER_START_REQ( alloc_file_handle )
{
req->access = access;
req->inherit = inherit;
req->fd = fd;
if (!(ret = wine_server_call( req ))) *handle = reply->handle;
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* wine_server_handle_to_fd (NTDLL.@)
*
* Retrieve the Unix fd corresponding to a file handle.
*/
int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *unix_fd,
enum fd_type *type, int *flags )
{
obj_handle_t fd_handle;
int ret, fd = -1;
*unix_fd = -1;
for (;;)
{
SERVER_START_REQ( get_handle_fd )
{
req->handle = handle;
req->access = access;
if (!(ret = wine_server_call( req ))) fd = reply->fd;
if (type) *type = reply->type;
if (flags) *flags = reply->flags;
}
SERVER_END_REQ;
if (ret) return ret;
if (fd != -1) break;
/* it wasn't in the cache, get it from the server */
fd = receive_fd( &fd_handle );
/* and store it back into the cache */
fd = store_cached_fd( fd, fd_handle );
if (fd_handle == handle) break;
/* if we received a different handle this means there was
* a race with another thread; we restart everything from
* scratch in this case.
*/
}
if ((fd != -1) && ((fd = dup(fd)) == -1)) return STATUS_TOO_MANY_OPENED_FILES;
*unix_fd = fd;
return STATUS_SUCCESS;
}
/***********************************************************************
* start_server
*
* Start a new wine server.
*/
static void start_server( const char *oldcwd )
{
static int started; /* we only try once */
char *path, *p;
if (!started)
{
int status;
int pid = fork();
if (pid == -1) fatal_perror( "fork" );
if (!pid)
{
/* if server is explicitly specified, use this */
if ((p = getenv("WINESERVER")))
{
if (p[0] != '/' && oldcwd[0] == '/') /* make it an absolute path */
{
if (!(path = malloc( strlen(oldcwd) + strlen(p) + 1 )))
fatal_error( "out of memory\n" );
sprintf( path, "%s/%s", oldcwd, p );
p = path;
}
execl( p, p, NULL );
fatal_perror( "could not exec the server '%s'\n"
" specified in the WINESERVER environment variable", p );
}
/* first try the installation dir */
execl( BINDIR "/wineserver", "wineserver", NULL );
/* now try the dir we were launched from */
if (full_argv0)
{
if (!(path = malloc( strlen(full_argv0) + 20 )))
fatal_error( "out of memory\n" );
if ((p = strrchr( strcpy( path, full_argv0 ), '/' )))
{
strcpy( p, "/wineserver" );
execl( path, path, NULL );
}
free(path);
}
/* finally try the path */
execlp( "wineserver", "wineserver", NULL );
fatal_error( "could not exec wineserver\n" );
}
waitpid( pid, &status, 0 );
status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
if (status == 2) return; /* server lock held by someone else, will retry later */
if (status) exit(status); /* server failed */
started = 1;
}
}
/***********************************************************************
* server_connect_error
*
* Try to display a meaningful explanation of why we couldn't connect
* to the server.
*/
static void server_connect_error( const char *serverdir )
{
int fd;
struct flock fl;
if ((fd = open( LOCKNAME, O_WRONLY )) == -1)
fatal_error( "for some mysterious reason, the wine server never started.\n" );
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 1;
if (fcntl( fd, F_GETLK, &fl ) != -1)
{
if (fl.l_type == F_WRLCK) /* the file is locked */
fatal_error( "a wine server seems to be running, but I cannot connect to it.\n"
" You probably need to kill that process (it might be pid %d).\n",
(int)fl.l_pid );
fatal_error( "for some mysterious reason, the wine server failed to run.\n" );
}
fatal_error( "the file system of '%s' doesn't support locks,\n"
" and there is a 'socket' file in that directory that prevents wine from starting.\n"
" You should make sure no wine server is running, remove that file and try again.\n",
serverdir );
}
/***********************************************************************
* server_connect
*
* Attempt to connect to an existing server socket.
* We need to be in the server directory already.
*/
static int server_connect( const char *oldcwd, const char *serverdir )
{
struct sockaddr_un addr;
struct stat st;
int s, slen, retry;
/* chdir to the server directory */
if (chdir( serverdir ) == -1)
{
if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
start_server( "." );
if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
}
/* make sure we are at the right place */
if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
for (retry = 0; retry < 6; retry++)
{
/* if not the first try, wait a bit to leave the previous server time to exit */
if (retry)
{
usleep( 100000 * retry * retry );
start_server( oldcwd );
if (lstat( SOCKETNAME, &st ) == -1) continue; /* still no socket, wait a bit more */
}
else if (lstat( SOCKETNAME, &st ) == -1) /* check for an already existing socket */
{
if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
start_server( oldcwd );
if (lstat( SOCKETNAME, &st ) == -1) continue; /* still no socket, wait a bit more */
}
/* make sure the socket is sane (ISFIFO needed for Solaris) */
if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
if (st.st_uid != getuid())
fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
/* try to connect to it */
addr.sun_family = AF_UNIX;
strcpy( addr.sun_path, SOCKETNAME );
slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
#ifdef HAVE_SOCKADDR_SUN_LEN
addr.sun_len = slen;
#endif
if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
{
fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
return s;
}
close( s );
}
server_connect_error( serverdir );
}
/***********************************************************************
* CLIENT_InitServer
*
* Start the server and create the initial socket pair.
*/
void CLIENT_InitServer(void)
{
int size;
char *oldcwd;
obj_handle_t dummy_handle;
/* retrieve the current directory */
for (size = 512; ; size *= 2)
{
if (!(oldcwd = malloc( size ))) break;
if (getcwd( oldcwd, size )) break;
free( oldcwd );
if (errno == ERANGE) continue;
oldcwd = NULL;
break;
}
/* if argv[0] is a relative path, make it absolute */
full_argv0 = argv0;
if (oldcwd && argv0[0] != '/' && strchr( argv0, '/' ))
{
char *new_argv0 = malloc( strlen(oldcwd) + strlen(argv0) + 2 );
if (new_argv0)
{
strcpy( new_argv0, oldcwd );
strcat( new_argv0, "/" );
strcat( new_argv0, argv0 );
full_argv0 = new_argv0;
}
}
/* connect to the server */
fd_socket = server_connect( oldcwd, wine_get_server_dir() );
/* switch back to the starting directory */
if (oldcwd)
{
chdir( oldcwd );
free( oldcwd );
}
/* setup the signal mask */
sigemptyset( &block_set );
sigaddset( &block_set, SIGALRM );
sigaddset( &block_set, SIGIO );
sigaddset( &block_set, SIGINT );
sigaddset( &block_set, SIGHUP );
/* receive the first thread request fd on the main socket */
NtCurrentTeb()->request_fd = receive_fd( &dummy_handle );
CLIENT_InitThread();
}
/***********************************************************************
* CLIENT_InitThread
*
* Send an init thread request. Return 0 if OK.
*/
void CLIENT_InitThread(void)
{
TEB *teb = NtCurrentTeb();
int version, ret;
int reply_pipe[2];
/* ignore SIGPIPE so that we get a EPIPE error instead */
signal( SIGPIPE, SIG_IGN );
/* automatic child reaping to avoid zombies */
signal( SIGCHLD, SIG_IGN );
/* create the server->client communication pipes */
if (pipe( reply_pipe ) == -1) server_protocol_perror( "pipe" );
if (pipe( teb->wait_fd ) == -1) server_protocol_perror( "pipe" );
wine_server_send_fd( reply_pipe[1] );
wine_server_send_fd( teb->wait_fd[1] );
teb->reply_fd = reply_pipe[0];
/* set close on exec flag */
fcntl( teb->reply_fd, F_SETFD, 1 );
fcntl( teb->wait_fd[0], F_SETFD, 1 );
fcntl( teb->wait_fd[1], F_SETFD, 1 );
SERVER_START_REQ( init_thread )
{
req->unix_pid = getpid();
req->teb = teb;
req->entry = teb->entry_point;
req->reply_fd = reply_pipe[1];
req->wait_fd = teb->wait_fd[1];
ret = wine_server_call( req );
teb->pid = reply->pid;
teb->tid = reply->tid;
version = reply->version;
if (reply->boot) boot_thread_id = teb->tid;
else if (boot_thread_id == teb->tid) boot_thread_id = 0;
close( reply_pipe[1] );
}
SERVER_END_REQ;
if (ret) server_protocol_error( "init_thread failed with status %x\n", ret );
if (version != SERVER_PROTOCOL_VERSION)
server_protocol_error( "version mismatch %d/%d.\n"
"Your %s binary was not upgraded correctly,\n"
"or you have an older one somewhere in your PATH.\n"
"Or maybe the wrong wineserver is still running?\n",
version, SERVER_PROTOCOL_VERSION,
(version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
}
/***********************************************************************
* CLIENT_BootDone
*
* Signal that we have finished booting, and set debug level.
*/
void CLIENT_BootDone( int debug_level )
{
SERVER_START_REQ( boot_done )
{
req->debug_level = debug_level;
wine_server_call( req );
}
SERVER_END_REQ;
}
/***********************************************************************
* CLIENT_IsBootThread
*
* Return TRUE if current thread is the boot thread.
*/
int CLIENT_IsBootThread(void)
{
return (GetCurrentThreadId() == (DWORD)boot_thread_id);
}
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