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c6c801d993
Avoids inheritance of file handles on Windows systems similar to the
O_CLOEXEC/FD_CLOEXEC flag on Linux.
Fixes file lock issues in Windows applications when a child process
is started with handle inheritance enabled (standard input/output
redirection) while a FFmpeg transcoding is running in the parent
process.
Links relevant to the subject:
https://msdn.microsoft.com/en-us/library/w7sa2b22.aspx
Describes the _wsopen() function and the O_NOINHERIT flag. File handles
opened by _wsopen() are inheritable by default.
https://msdn.microsoft.com/en-us/library/windows/desktop/ms682425%28v=vs.85%29.aspx
Describes handle inheritance when creating new processes. Handle
inheritance must be enabled (bInheritHandles = TRUE) e.g. when you want
to pass handles for stdin/stdout via lpStartupInfo.
Signed-off-by: Tobias Rapp <t.rapp@noa-audio.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4746653466)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "internal.h"
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#include "mem.h"
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#include <stdarg.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_IO_H
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#include <io.h>
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#endif
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#if defined(_WIN32) && !defined(__MINGW32CE__)
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#undef open
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#undef lseek
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#undef stat
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#undef fstat
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#include <windows.h>
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#include <share.h>
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#include <errno.h>
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#include "wchar_filename.h"
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static int win32_open(const char *filename_utf8, int oflag, int pmode)
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{
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int fd;
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wchar_t *filename_w;
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/* convert UTF-8 to wide chars */
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if (utf8towchar(filename_utf8, &filename_w))
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return -1;
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if (!filename_w)
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goto fallback;
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fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
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av_freep(&filename_w);
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if (fd != -1 || (oflag & O_CREAT))
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return fd;
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fallback:
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/* filename may be in CP_ACP */
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return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
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}
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#define open win32_open
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#endif
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int avpriv_open(const char *filename, int flags, ...)
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{
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int fd;
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unsigned int mode = 0;
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va_list ap;
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va_start(ap, flags);
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if (flags & O_CREAT)
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mode = va_arg(ap, unsigned int);
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va_end(ap);
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#ifdef O_CLOEXEC
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flags |= O_CLOEXEC;
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#endif
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#ifdef O_NOINHERIT
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flags |= O_NOINHERIT;
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#endif
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fd = open(filename, flags, mode);
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#if HAVE_FCNTL
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if (fd != -1) {
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
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av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
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}
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#endif
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return fd;
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}
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FILE *av_fopen_utf8(const char *path, const char *mode)
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{
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int fd;
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int access;
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const char *m = mode;
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switch (*m++) {
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case 'r': access = O_RDONLY; break;
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case 'w': access = O_CREAT|O_WRONLY|O_TRUNC; break;
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case 'a': access = O_CREAT|O_WRONLY|O_APPEND; break;
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default :
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errno = EINVAL;
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return NULL;
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}
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while (*m) {
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if (*m == '+') {
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access &= ~(O_RDONLY | O_WRONLY);
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access |= O_RDWR;
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} else if (*m == 'b') {
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#ifdef O_BINARY
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access |= O_BINARY;
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#endif
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} else if (*m) {
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errno = EINVAL;
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return NULL;
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}
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m++;
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}
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fd = avpriv_open(path, access, 0666);
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if (fd == -1)
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return NULL;
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return fdopen(fd, mode);
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}
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