-/*
-Copyright (C) 1993, 1995 Free Software Foundation
-
-This file is part of the GNU IO Library. This library is free
-software; you can redistribute it and/or modify it under the
-terms of the GNU General Public License as published by the
-Free Software Foundation; either version 2, 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 General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this library; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
-As a special exception, if you link this library with files
-compiled with a GNU compiler to produce an executable, this does not cause
-the resulting executable to be covered by the GNU General Public License.
-This exception does not however invalidate any other reasons why
-the executable file might be covered by the GNU General Public License. */
-
-#include "libioP.h"
-#include "stdio.h"
-
-FILE*
-freopen (filename, mode, fp)
- const char* filename;
- const char* mode;
- FILE* fp;
+/* Copyright (C) 1993-2019 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C 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.
+
+ The GNU C 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 the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>.
+
+ As a special exception, if you link the code in this file with
+ files compiled with a GNU compiler to produce an executable,
+ that does not cause the resulting executable to be covered by
+ the GNU Lesser General Public License. This exception does not
+ however invalidate any other reasons why the executable file
+ might be covered by the GNU Lesser General Public License.
+ This exception applies to code released by its copyright holders
+ in files containing the exception. */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libioP.h>
+#include <fd_to_filename.h>
+#include <shlib-compat.h>
+
+FILE *
+freopen (const char *filename, const char *mode, FILE *fp)
{
+ FILE *result = NULL;
+ char fdfilename[FD_TO_FILENAME_SIZE];
+
CHECK_FILE (fp, NULL);
+
+ _IO_acquire_lock (fp);
+ /* First flush the stream (failure should be ignored). */
+ _IO_SYNC (fp);
+
if (!(fp->_flags & _IO_IS_FILEBUF))
- return NULL;
- return _IO_freopen (filename, mode, fp);
+ goto end;
+
+ int fd = _IO_fileno (fp);
+ const char *gfilename
+ = filename != NULL ? filename : fd_to_filename (fd, fdfilename);
+
+ fp->_flags2 |= _IO_FLAGS2_NOCLOSE;
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
+ if (&_IO_stdin_used == NULL)
+ {
+ /* If the shared C library is used by the application binary which
+ was linked against the older version of libio, we just use the
+ older one even for internal use to avoid trouble since a pointer
+ to the old libio may be passed into shared C library and wind
+ up here. */
+ _IO_old_file_close_it (fp);
+ _IO_JUMPS_FUNC_UPDATE (fp, &_IO_old_file_jumps);
+ result = _IO_old_file_fopen (fp, gfilename, mode);
+ }
+ else
+#endif
+ {
+ _IO_file_close_it (fp);
+ _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps;
+ if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL)
+ fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;
+ result = _IO_file_fopen (fp, gfilename, mode, 1);
+ if (result != NULL)
+ result = __fopen_maybe_mmap (result);
+ }
+ fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE;
+ if (result != NULL)
+ {
+ /* unbound stream orientation */
+ result->_mode = 0;
+
+ if (fd != -1 && _IO_fileno (result) != fd)
+ {
+ /* At this point we have both file descriptors already allocated,
+ so __dup3 will not fail with EBADF, EINVAL, or EMFILE. But
+ we still need to check for EINVAL and, due Linux internal
+ implementation, EBUSY. It is because on how it internally opens
+ the file by splitting the buffer allocation operation and VFS
+ opening (a dup operation may run when a file is still pending
+ 'install' on VFS). */
+ if (__dup3 (_IO_fileno (result), fd,
+ (result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0
+ ? O_CLOEXEC : 0) == -1)
+ {
+ _IO_file_close_it (result);
+ result = NULL;
+ goto end;
+ }
+ __close (_IO_fileno (result));
+ _IO_fileno (result) = fd;
+ }
+ }
+ else if (fd != -1)
+ __close (fd);
+
+end:
+ _IO_release_lock (fp);
+ return result;
}
projects / thirdparty / glibc.git / blobdiff