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Added a critical section around the fd cache until the race conditions 

can be fixed properly.
This commit is contained in:
Alexandre Julliard 2005-10-06 12:31:36 +00:00
parent a54da42ef3
commit b87bce1b99
1 changed files with 23 additions and 6 deletions
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29
dlls/ntdll/server.c
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@ -91,6 +91,16 @@ extern struct wine_pthread_functions pthread_functions;
static sigset_t block_set; /* signals to block during server calls */
static int fd_socket = -1; /* socket to exchange file descriptors with the server */
static RTL_CRITICAL_SECTION fd_cache_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &fd_cache_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": fd_cache_section") }
};
static RTL_CRITICAL_SECTION fd_cache_section = { &critsect_debug, -1, 0, 0, 0, 0 };
#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)));
@ -473,6 +483,8 @@ int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *uni
obj_handle_t fd_handle;
int ret, removable = -1, fd = -1;
RtlEnterCriticalSection( &fd_cache_section );
*unix_fd = -1;
for (;;)
{
@ -488,17 +500,21 @@ int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *uni
}
}
SERVER_END_REQ;
if (ret) return ret;
if (ret) break;
if (fd != -1)
{
if ((fd = dup(fd)) == -1) return FILE_GetNtStatus();
if ((fd = dup(fd)) == -1) ret = FILE_GetNtStatus();
break;
}
/* it wasn't in the cache, get it from the server */
fd = receive_fd( &fd_handle );
if (fd == -1) return STATUS_TOO_MANY_OPENED_FILES;
if (fd == -1)
{
ret = STATUS_TOO_MANY_OPENED_FILES;
break;
}
if (fd_handle != handle) removable = -1;
if (removable == -1)
@ -530,7 +546,7 @@ int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *uni
}
}
SERVER_END_REQ;
if (ret) return ret;
if (ret) break;
if (fd_handle == handle) break;
/* if we received a different handle this means there was
@ -540,8 +556,9 @@ int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *uni
close( fd );
}
*unix_fd = fd;
return STATUS_SUCCESS;
RtlLeaveCriticalSection( &fd_cache_section );
if (!ret) *unix_fd = fd;
return ret;
}