| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1993-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | As a special exception, if you link the code in this file with |
| 19 | files compiled with a GNU compiler to produce an executable, |
| 20 | that does not cause the resulting executable to be covered by |
| 21 | the GNU Lesser General Public License. This exception does not |
| 22 | however invalidate any other reasons why the executable file |
| 23 | might be covered by the GNU Lesser General Public License. |
| 24 | This exception applies to code released by its copyright holders |
| 25 | in files containing the exception. */ |
| 26 | |
| 27 | #include "libioP.h" |
| 28 | #include "stdio.h" |
| 29 | #include <fcntl.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | #include <fd_to_filename.h> |
| 34 | |
| 35 | #include <kernel-features.h> |
| 36 | |
| 37 | FILE * |
| 38 | freopen64 (const char *filename, const char *mode, FILE *fp) |
| 39 | { |
| 40 | FILE *result; |
| 41 | CHECK_FILE (fp, NULL); |
| 42 | if (!(fp->_flags & _IO_IS_FILEBUF)) |
| 43 | return NULL; |
| 44 | _IO_acquire_lock (fp); |
| 45 | int fd = _IO_fileno (fp); |
| 46 | const char *gfilename = (filename == NULL && fd >= 0 |
| 47 | ? fd_to_filename (fd) : filename); |
| 48 | fp->_flags2 |= _IO_FLAGS2_NOCLOSE; |
| 49 | _IO_file_close_it (fp); |
| 50 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
| 51 | if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL) |
| 52 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
| 53 | result = _IO_file_fopen (fp, gfilename, mode, 0); |
| 54 | fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE; |
| 55 | if (result != NULL) |
| 56 | result = __fopen_maybe_mmap (result); |
| 57 | if (result != NULL) |
| 58 | { |
| 59 | /* unbound stream orientation */ |
| 60 | result->_mode = 0; |
| 61 | |
| 62 | if (fd != -1) |
| 63 | { |
| 64 | #ifdef O_CLOEXEC |
| 65 | # ifndef __ASSUME_DUP3 |
| 66 | int newfd; |
| 67 | if (__have_dup3 < 0) |
| 68 | newfd = -1; |
| 69 | else |
| 70 | newfd = |
| 71 | # endif |
| 72 | __dup3 (_IO_fileno (result), fd, |
| 73 | (result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0 |
| 74 | ? O_CLOEXEC : 0); |
| 75 | #else |
| 76 | # define newfd 1 |
| 77 | #endif |
| 78 | |
| 79 | #ifndef __ASSUME_DUP3 |
| 80 | if (newfd < 0) |
| 81 | { |
| 82 | if (errno == ENOSYS) |
| 83 | __have_dup3 = -1; |
| 84 | |
| 85 | __dup2 (_IO_fileno (result), fd); |
| 86 | if ((result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0) |
| 87 | __fcntl (fd, F_SETFD, FD_CLOEXEC); |
| 88 | } |
| 89 | #endif |
| 90 | __close (_IO_fileno (result)); |
| 91 | _IO_fileno (result) = fd; |
| 92 | } |
| 93 | } |
| 94 | else if (fd != -1) |
| 95 | __close (fd); |
| 96 | if (filename == NULL) |
| 97 | free ((char *) gfilename); |
| 98 | _IO_release_lock (fp); |
| 99 | return result; |
| 100 | } |