diff options
Diffstat (limited to 'REORG.TODO/libio/freopen.c')
| -rw-r--r-- | REORG.TODO/libio/freopen.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/REORG.TODO/libio/freopen.c b/REORG.TODO/libio/freopen.c new file mode 100644 index 0000000000..980523af48 --- /dev/null +++ b/REORG.TODO/libio/freopen.c @@ -0,0 +1,109 @@ +/* Copyright (C) 1993-2017 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 + <http://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 "libioP.h" +#include "stdio.h" +#include <fcntl.h> +#include <stdlib.h> +#include <unistd.h> + +#include <shlib-compat.h> +#include <fd_to_filename.h> + +#include <kernel-features.h> + +FILE * +freopen (const char *filename, const char *mode, FILE *fp) +{ + FILE *result; + CHECK_FILE (fp, NULL); + if (!(fp->_flags & _IO_IS_FILEBUF)) + return NULL; + _IO_acquire_lock (fp); + int fd = _IO_fileno (fp); + const char *gfilename = (filename == NULL && fd >= 0 + ? fd_to_filename (fd) : filename); + 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_FILE_plus (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: + if (filename == NULL) + free ((char *) gfilename); + + _IO_release_lock (fp); + return result; +} |