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- make file functions (mostly) thread-safe 

- update a couple traces
This commit is contained in:
Juan Lang 2004-12-14 11:59:43 +00:00 committed by Alexandre Julliard
parent c4de952eb5
commit 9b6c0eff37
1 changed files with 112 additions and 48 deletions
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160
dlls/msvcrt/file.c
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@ -6,6 +6,7 @@
* Copyright 1997,2000 Uwe Bonnes
* Copyright 2000 Jon Griffiths
* Copyright 2004 Eric Pouech
* Copyright 2004 Juan Lang
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -96,9 +97,16 @@ static const ULONGLONG WCBAT = TOUL('b') << 32 | TOUL('a') << 16 | TOUL('t');
static const ULONGLONG WCCMD = TOUL('c') << 32 | TOUL('m') << 16 | TOUL('d');
static const ULONGLONG WCCOM = TOUL('c') << 32 | TOUL('o') << 16 | TOUL('m');
extern CRITICAL_SECTION MSVCRT_file_cs;
#define LOCK_FILES EnterCriticalSection(&MSVCRT_file_cs)
#define UNLOCK_FILES LeaveCriticalSection(&MSVCRT_file_cs)
/* This critical section protects the tables MSVCRT_fdesc and MSVCRT_fstreams,
* and their related indexes, MSVCRT_fdstart, MSVCRT_fdend,
* and MSVCRT_stream_idx, from race conditions.
* It doesn't protect against race conditions manipulating the underlying files
* or flags; doing so would probably be better accomplished with per-file
* protection, rather than locking the whole table for every change.
*/
static CRITICAL_SECTION MSVCRT_file_cs;
#define LOCK_FILES() do { EnterCriticalSection(&MSVCRT_file_cs); } while (0)
#define UNLOCK_FILES() do { LeaveCriticalSection(&MSVCRT_file_cs); } while (0)
static void msvcrt_cp_from_stati64(const struct MSVCRT__stati64 *bufi64, struct MSVCRT__stat *buf)
{
@ -120,7 +128,12 @@ static inline BOOL msvcrt_is_valid_fd(int fd)
return fd >= 0 && fd < MSVCRT_fdend && (MSVCRT_fdesc[fd].wxflag & WX_OPEN);
}
/* INTERNAL: Get the HANDLE for a fd */
/* INTERNAL: Get the HANDLE for a fd
* This doesn't lock the table, because a failure will result in
* INVALID_HANDLE_VALUE being returned, which should be handled correctly. If
* it returns a valid handle which is about to be closed, a subsequent call
* will fail, most likely in a sane way.
*/
static HANDLE msvcrt_fdtoh(int fd)
{
if (!msvcrt_is_valid_fd(fd))
@ -128,7 +141,7 @@ static HANDLE msvcrt_fdtoh(int fd)
WARN(":fd (%d) - no handle!\n",fd);
*MSVCRT___doserrno() = 0;
*MSVCRT__errno() = MSVCRT_EBADF;
return INVALID_HANDLE_VALUE;
return INVALID_HANDLE_VALUE;
}
if (MSVCRT_fdesc[fd].handle == INVALID_HANDLE_VALUE) FIXME("wtf\n");
return MSVCRT_fdesc[fd].handle;
@ -137,6 +150,7 @@ static HANDLE msvcrt_fdtoh(int fd)
/* INTERNAL: free a file entry fd */
static void msvcrt_free_fd(int fd)
{
LOCK_FILES();
MSVCRT_fdesc[fd].handle = INVALID_HANDLE_VALUE;
MSVCRT_fdesc[fd].wxflag = 0;
TRACE(":fd (%d) freed\n",fd);
@ -156,9 +170,11 @@ static void msvcrt_free_fd(int fd)
if (fd < MSVCRT_fdstart)
MSVCRT_fdstart = fd;
}
UNLOCK_FILES();
}
/* INTERNAL: Allocate an fd slot from a Win32 HANDLE, starting from fd */
/* caller must hold the files lock */
static int msvcrt_alloc_fd_from(HANDLE hand, int flag, int fd)
{
if (fd >= MSVCRT_MAX_FILES)
@ -194,12 +210,17 @@ static int msvcrt_alloc_fd_from(HANDLE hand, int flag, int fd)
/* INTERNAL: Allocate an fd slot from a Win32 HANDLE */
static int msvcrt_alloc_fd(HANDLE hand, int flag)
{
int ret;
LOCK_FILES();
TRACE(":handle (%p) allocating fd (%d)\n",hand,MSVCRT_fdstart);
return msvcrt_alloc_fd_from(hand, flag, MSVCRT_fdstart);
ret = msvcrt_alloc_fd_from(hand, flag, MSVCRT_fdstart);
UNLOCK_FILES();
return ret;
}
/* INTERNAL: Allocate a FILE* for an fd slot
*/
/* INTERNAL: Allocate a FILE* for an fd slot */
/* caller must hold the files lock */
static MSVCRT_FILE* msvcrt_alloc_fp(void)
{
unsigned int i;
@ -288,6 +309,7 @@ void msvcrt_init_io(void)
STARTUPINFOA si;
int i;
InitializeCriticalSection(&MSVCRT_file_cs);
GetStartupInfoA(&si);
if (si.cbReserved2 != 0 && si.lpReserved2 != NULL)
{
@ -544,6 +566,7 @@ int _flushall(void)
{
int i, num_flushed = 0;
LOCK_FILES();
for (i = 3; i < MSVCRT_stream_idx; i++)
if (MSVCRT_fstreams[i] && MSVCRT_fstreams[i]->_flag)
{
@ -558,6 +581,7 @@ int _flushall(void)
num_flushed++;
}
}
UNLOCK_FILES();
TRACE(":flushed (%d) handles\n",num_flushed);
return num_flushed;
@ -582,21 +606,28 @@ int MSVCRT_fflush(MSVCRT_FILE* file)
*/
int _close(int fd)
{
HANDLE hand = msvcrt_fdtoh(fd);
HANDLE hand;
int ret;
LOCK_FILES();
hand = msvcrt_fdtoh(fd);
TRACE(":fd (%d) handle (%p)\n",fd,hand);
if (hand == INVALID_HANDLE_VALUE)
return -1;
if (!CloseHandle(hand))
ret = -1;
else if (!CloseHandle(hand))
{
WARN(":failed-last error (%ld)\n",GetLastError());
msvcrt_set_errno(GetLastError());
return -1;
ret = -1;
}
msvcrt_free_fd(fd);
else
{
msvcrt_free_fd(fd);
ret = 0;
}
UNLOCK_FILES();
TRACE(":ok\n");
return 0;
return ret;
}
/*********************************************************************
@ -640,6 +671,7 @@ int _dup2(int od, int nd)
int ret;
TRACE("(od=%d, nd=%d)\n", od, nd);
LOCK_FILES();
if (nd < MSVCRT_MAX_FILES && msvcrt_is_valid_fd(od))
{
HANDLE handle;
@ -674,6 +706,7 @@ int _dup2(int od, int nd)
*MSVCRT__errno() = MSVCRT_EBADF;
ret = -1;
}
UNLOCK_FILES();
return ret;
}
@ -682,11 +715,16 @@ int _dup2(int od, int nd)
*/
int _dup(int od)
{
int fd = MSVCRT_fdstart;
int fd, ret;
LOCK_FILES();
fd = MSVCRT_fdstart;
if (_dup2(od, fd) == 0)
return fd;
return -1;
ret = fd;
else
ret = -1;
UNLOCK_FILES();
return ret;
}
/*********************************************************************
@ -710,7 +748,10 @@ int _eof(int fd)
endpos = SetFilePointer(hand, 0, &hendpos, FILE_END);
if (curpos == endpos && hcurpos == hendpos)
{
/* FIXME: shouldn't WX_ATEOF be set here? */
return TRUE;
}
SetFilePointer(hand, curpos, &hcurpos, FILE_BEGIN);
return FALSE;
@ -723,10 +764,12 @@ int MSVCRT__fcloseall(void)
{
int num_closed = 0, i;
LOCK_FILES();
for (i = 3; i < MSVCRT_stream_idx; i++)
if (MSVCRT_fstreams[i] && MSVCRT_fstreams[i]->_flag &&
MSVCRT_fclose(MSVCRT_fstreams[i]))
num_closed++;
UNLOCK_FILES();
TRACE(":closed (%d) handles\n",num_closed);
return num_closed;
@ -739,6 +782,7 @@ void msvcrt_free_io(void)
_close(0);
_close(1);
_close(2);
DeleteCriticalSection(&MSVCRT_file_cs);
}
/*********************************************************************
@ -932,13 +976,16 @@ MSVCRT_FILE* MSVCRT__fdopen(int fd, const char *mode)
if (msvcrt_get_flags(mode, &open_flags, &stream_flags) == -1) return NULL;
if (!(file = msvcrt_alloc_fp())) return NULL;
if (msvcrt_init_fp(file, fd, stream_flags) == -1)
LOCK_FILES();
if (!(file = msvcrt_alloc_fp()))
file = NULL;
else if (msvcrt_init_fp(file, fd, stream_flags) == -1)
{
file->_flag = 0;
file = NULL;
}
else TRACE(":fd (%d) mode (%s) FILE* (%p)\n",fd,mode,file);
UNLOCK_FILES();
return file;
}
@ -957,8 +1004,10 @@ MSVCRT_FILE* MSVCRT__wfdopen(int fd, const MSVCRT_wchar_t *mode)
WideCharToMultiByte(CP_ACP,0,mode,mlen,modea,mlen,NULL,NULL))
{
if (msvcrt_get_flags(modea, &open_flags, &stream_flags) == -1) return NULL;
if (!(file = msvcrt_alloc_fp())) return NULL;
if (msvcrt_init_fp(file, fd, stream_flags) == -1)
LOCK_FILES();
if (!(file = msvcrt_alloc_fp()))
file = NULL;
else if (msvcrt_init_fp(file, fd, stream_flags) == -1)
{
file->_flag = 0;
file = NULL;
@ -969,6 +1018,7 @@ MSVCRT_FILE* MSVCRT__wfdopen(int fd, const MSVCRT_wchar_t *mode)
MSVCRT_rewind(file); /* FIXME: is this needed ??? */
TRACE(":fd (%d) mode (%s) FILE* (%p)\n",fd,debugstr_w(mode),file);
}
UNLOCK_FILES();
}
return file;
}
@ -1265,6 +1315,7 @@ int _pipe(int *pfds, unsigned int psize, int textmode)
unsigned int wxflags = split_oflags(textmode);
int fd;
LOCK_FILES();
fd = msvcrt_alloc_fd(readHandle, wxflags);
if (fd != -1)
{
@ -1288,6 +1339,7 @@ int _pipe(int *pfds, unsigned int psize, int textmode)
CloseHandle(writeHandle);
*MSVCRT__errno() = MSVCRT_EMFILE;
}
UNLOCK_FILES();
}
else
msvcrt_set_errno(GetLastError());
@ -1515,12 +1567,14 @@ int _rmtmp(void)
{
int num_removed = 0, i;
LOCK_FILES();
for (i = 3; i < MSVCRT_stream_idx; i++)
if (MSVCRT_fstreams[i] && MSVCRT_fstreams[i]->_tmpfname)
{
MSVCRT_fclose(MSVCRT_fstreams[i]);
num_removed++;
}
UNLOCK_FILES();
if (num_removed)
TRACE(":removed (%d) temp files\n",num_removed);
@ -1618,9 +1672,9 @@ int _setmode(int fd,int mode)
if (mode & (~(MSVCRT__O_TEXT|MSVCRT__O_BINARY)))
FIXME("fd (%d) mode (0x%08x) unknown\n",fd,mode);
if ((mode & MSVCRT__O_TEXT) == MSVCRT__O_TEXT)
MSVCRT_fdesc[fd].wxflag |= WX_TEXT;
MSVCRT_fdesc[fd].wxflag |= WX_TEXT;
else
MSVCRT_fdesc[fd].wxflag &= ~WX_TEXT;
MSVCRT_fdesc[fd].wxflag &= ~WX_TEXT;
return ret;
}
@ -1901,7 +1955,8 @@ int _write(int fd, const void* buf, unsigned int count)
if (WriteFile(hand, buf, count, &num_written, NULL)
&& (num_written == count))
return num_written;
TRACE(":failed-last error (%ld)\n",GetLastError());
TRACE("WriteFile (fd %d, hand %p) failed-last error (%ld)\n", fd,
hand, GetLastError());
*MSVCRT__errno() = MSVCRT_ENOSPC;
}
else
@ -1943,7 +1998,8 @@ int _write(int fd, const void* buf, unsigned int count)
if ((WriteFile(hand, p, count+nr_lf, &num_written, NULL) == 0 ) || (num_written != count+nr_lf))
{
TRACE(":failed-last error (%ld) num_written %ld\n",GetLastError(),num_written);
TRACE("WriteFile (fd %d, hand %p) failed-last error (%ld), num_written %ld\n",
fd, hand, GetLastError(), num_written);
*MSVCRT__errno() = MSVCRT_ENOSPC;
if(nr_lf)
MSVCRT_free(p);
@ -2255,12 +2311,12 @@ MSVCRT_FILE* MSVCRT_fopen(const char *path, const char *mode)
if (msvcrt_get_flags(mode, &open_flags, &stream_flags) == -1)
return NULL;
LOCK_FILES();
fd = _open(path, open_flags, MSVCRT__S_IREAD | MSVCRT__S_IWRITE);
if (fd < 0)
return NULL;
if ((file = msvcrt_alloc_fp()) && msvcrt_init_fp(file, fd, stream_flags) != -1)
file = NULL;
else if ((file = msvcrt_alloc_fp()) && msvcrt_init_fp(file, fd, stream_flags)
!= -1)
TRACE(":fd (%d) mode (%s) FILE* (%p)\n",fd,mode,file);
else if (file)
{
@ -2271,6 +2327,7 @@ MSVCRT_FILE* MSVCRT_fopen(const char *path, const char *mode)
TRACE(":got (%p)\n",file);
if (!file)
_close(fd);
UNLOCK_FILES();
return file;
}
@ -2428,26 +2485,31 @@ MSVCRT_FILE* MSVCRT_freopen(const char *path, const char *mode,MSVCRT_FILE* file
int open_flags, stream_flags, fd;
TRACE(":path (%p) mode (%s) file (%p) fd (%d)\n",path,mode,file,file->_file);
LOCK_FILES();
if (!file || ((fd = file->_file) < 0) || fd > MSVCRT_fdend)
return NULL;
MSVCRT_fclose(file);
/* map mode string to open() flags. "man fopen" for possibilities. */
if (msvcrt_get_flags(mode, &open_flags, &stream_flags) == -1)
return NULL;
fd = _open(path, open_flags, MSVCRT__S_IREAD | MSVCRT__S_IWRITE);
if (fd < 0)
return NULL;
if (msvcrt_init_fp(file, fd, stream_flags) == -1)
file = NULL;
else
{
file->_flag = 0;
WARN(":failed-last error (%ld)\n",GetLastError());
msvcrt_set_errno(GetLastError());
return NULL;
MSVCRT_fclose(file);
/* map mode string to open() flags. "man fopen" for possibilities. */
if (msvcrt_get_flags(mode, &open_flags, &stream_flags) == -1)
file = NULL;
else
{
fd = _open(path, open_flags, MSVCRT__S_IREAD | MSVCRT__S_IWRITE);
if (fd < 0)
file = NULL;
else if (msvcrt_init_fp(file, fd, stream_flags) == -1)
{
file->_flag = 0;
WARN(":failed-last error (%ld)\n",GetLastError());
msvcrt_set_errno(GetLastError());
file = NULL;
}
}
}
UNLOCK_FILES();
return file;
}
@ -2726,6 +2788,7 @@ MSVCRT_FILE* MSVCRT_tmpfile(void)
int fd;
MSVCRT_FILE* file = NULL;
LOCK_FILES();
fd = _open(filename, MSVCRT__O_CREAT | MSVCRT__O_BINARY | MSVCRT__O_RDWR | MSVCRT__O_TEMPORARY);
if (fd != -1 && (file = msvcrt_alloc_fp()))
{
@ -2736,6 +2799,7 @@ MSVCRT_FILE* MSVCRT_tmpfile(void)
}
else file->_tmpfname = _strdup(filename);
}
UNLOCK_FILES();
return file;
}