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b168057a | 1 | /* Copyright (C) 1993-2015 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
96aa2d94 | 3 | |
41bdb6e2 AJ |
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. | |
96aa2d94 | 8 | |
41bdb6e2 AJ |
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 | |
40a55d20 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
96aa2d94 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
96aa2d94 | 17 | |
41bdb6e2 AJ |
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. */ | |
96aa2d94 RM |
26 | |
27 | #include "libioP.h" | |
28 | #include "stdio.h" | |
94b7cc37 | 29 | #include <fcntl.h> |
1a35b7fd | 30 | #include <stdlib.h> |
94b7cc37 | 31 | #include <unistd.h> |
96aa2d94 | 32 | |
16710d58 | 33 | #include <shlib-compat.h> |
c44a663d | 34 | #include <fd_to_filename.h> |
16710d58 | 35 | |
37233df9 TS |
36 | #include <kernel-features.h> |
37 | ||
96aa2d94 | 38 | FILE* |
6973fc01 | 39 | freopen (filename, mode, fp) |
96aa2d94 RM |
40 | const char* filename; |
41 | const char* mode; | |
42 | FILE* fp; | |
43 | { | |
7c713e28 | 44 | FILE *result; |
96aa2d94 RM |
45 | CHECK_FILE (fp, NULL); |
46 | if (!(fp->_flags & _IO_IS_FILEBUF)) | |
47 | return NULL; | |
0261d33f | 48 | _IO_acquire_lock (fp); |
94b7cc37 UD |
49 | int fd = _IO_fileno (fp); |
50 | const char *gfilename = (filename == NULL && fd >= 0 | |
51 | ? fd_to_filename (fd) : filename); | |
52 | fp->_flags2 |= _IO_FLAGS2_NOCLOSE; | |
16710d58 | 53 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
6973fc01 | 54 | if (&_IO_stdin_used == NULL) |
81c64d40 UD |
55 | { |
56 | /* If the shared C library is used by the application binary which | |
57 | was linked against the older version of libio, we just use the | |
58 | older one even for internal use to avoid trouble since a pointer | |
59 | to the old libio may be passed into shared C library and wind | |
60 | up here. */ | |
61 | _IO_old_file_close_it (fp); | |
e69dcccb | 62 | _IO_JUMPS_FILE_plus (fp) = &_IO_old_file_jumps; |
94b7cc37 | 63 | result = _IO_old_file_fopen (fp, gfilename, mode); |
81c64d40 | 64 | } |
6973fc01 UD |
65 | else |
66 | #endif | |
81c64d40 | 67 | { |
d18ea0c5 | 68 | _IO_file_close_it (fp); |
e69dcccb | 69 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
bbdef797 | 70 | if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL) |
15a686af | 71 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
d18ea0c5 | 72 | result = _IO_file_fopen (fp, gfilename, mode, 1); |
81c64d40 UD |
73 | if (result != NULL) |
74 | result = __fopen_maybe_mmap (result); | |
75 | } | |
94b7cc37 | 76 | fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE; |
3b1de3ba | 77 | if (result != NULL) |
c44a663d | 78 | { |
94b7cc37 UD |
79 | /* unbound stream orientation */ |
80 | result->_mode = 0; | |
81 | ||
82 | if (fd != -1) | |
83 | { | |
84 | #ifdef O_CLOEXEC | |
85 | # ifndef __ASSUME_DUP3 | |
86 | int newfd; | |
87 | if (__have_dup3 < 0) | |
88 | newfd = -1; | |
89 | else | |
90 | newfd = | |
91 | # endif | |
dc70356c TS |
92 | __dup3 (_IO_fileno (result), fd, |
93 | (result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0 | |
94 | ? O_CLOEXEC : 0); | |
94b7cc37 UD |
95 | #else |
96 | # define newfd 1 | |
97 | #endif | |
98 | ||
99 | #ifndef __ASSUME_DUP3 | |
100 | if (newfd < 0) | |
101 | { | |
102 | if (errno == ENOSYS) | |
103 | __have_dup3 = -1; | |
104 | ||
ed690b2f | 105 | __dup2 (_IO_fileno (result), fd); |
94b7cc37 UD |
106 | if ((result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0) |
107 | __fcntl (fd, F_SETFD, FD_CLOEXEC); | |
108 | } | |
109 | #endif | |
110 | __close (_IO_fileno (result)); | |
111 | _IO_fileno (result) = fd; | |
112 | } | |
c44a663d | 113 | } |
94b7cc37 UD |
114 | else if (fd != -1) |
115 | __close (fd); | |
116 | if (filename == NULL) | |
117 | free ((char *) gfilename); | |
118 | ||
0261d33f | 119 | _IO_release_lock (fp); |
7c713e28 | 120 | return result; |
96aa2d94 | 121 | } |