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04277e02 | 1 | /* Copyright (C) 1993-2019 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 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://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 | 26 | |
0b727ed4 | 27 | #include <stdio.h> |
94b7cc37 | 28 | #include <fcntl.h> |
1a35b7fd | 29 | #include <stdlib.h> |
94b7cc37 | 30 | #include <unistd.h> |
96aa2d94 | 31 | |
0b727ed4 | 32 | #include <libioP.h> |
c44a663d | 33 | #include <fd_to_filename.h> |
0b727ed4 | 34 | #include <shlib-compat.h> |
37233df9 | 35 | |
9d46370c JM |
36 | FILE * |
37 | freopen (const char *filename, const char *mode, FILE *fp) | |
96aa2d94 | 38 | { |
0b727ed4 AZ |
39 | FILE *result = NULL; |
40 | char fdfilename[FD_TO_FILENAME_SIZE]; | |
41 | ||
96aa2d94 | 42 | CHECK_FILE (fp, NULL); |
0b727ed4 | 43 | |
0261d33f | 44 | _IO_acquire_lock (fp); |
0b727ed4 AZ |
45 | /* First flush the stream (failure should be ignored). */ |
46 | _IO_SYNC (fp); | |
47 | ||
48 | if (!(fp->_flags & _IO_IS_FILEBUF)) | |
49 | goto end; | |
50 | ||
94b7cc37 | 51 | int fd = _IO_fileno (fp); |
0b727ed4 AZ |
52 | const char *gfilename |
53 | = filename != NULL ? filename : fd_to_filename (fd, fdfilename); | |
54 | ||
94b7cc37 | 55 | fp->_flags2 |= _IO_FLAGS2_NOCLOSE; |
16710d58 | 56 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
6973fc01 | 57 | if (&_IO_stdin_used == NULL) |
81c64d40 UD |
58 | { |
59 | /* If the shared C library is used by the application binary which | |
60 | was linked against the older version of libio, we just use the | |
61 | older one even for internal use to avoid trouble since a pointer | |
62 | to the old libio may be passed into shared C library and wind | |
63 | up here. */ | |
64 | _IO_old_file_close_it (fp); | |
cfa61144 | 65 | _IO_JUMPS_FUNC_UPDATE (fp, &_IO_old_file_jumps); |
94b7cc37 | 66 | result = _IO_old_file_fopen (fp, gfilename, mode); |
81c64d40 | 67 | } |
6973fc01 UD |
68 | else |
69 | #endif | |
81c64d40 | 70 | { |
d18ea0c5 | 71 | _IO_file_close_it (fp); |
e69dcccb | 72 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
bbdef797 | 73 | if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL) |
15a686af | 74 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
d18ea0c5 | 75 | result = _IO_file_fopen (fp, gfilename, mode, 1); |
81c64d40 UD |
76 | if (result != NULL) |
77 | result = __fopen_maybe_mmap (result); | |
78 | } | |
94b7cc37 | 79 | fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE; |
3b1de3ba | 80 | if (result != NULL) |
c44a663d | 81 | { |
94b7cc37 UD |
82 | /* unbound stream orientation */ |
83 | result->_mode = 0; | |
84 | ||
f1a67a2c | 85 | if (fd != -1 && _IO_fileno (result) != fd) |
94b7cc37 | 86 | { |
f1a67a2c AZ |
87 | /* At this point we have both file descriptors already allocated, |
88 | so __dup3 will not fail with EBADF, EINVAL, or EMFILE. But | |
89 | we still need to check for EINVAL and, due Linux internal | |
90 | implementation, EBUSY. It is because on how it internally opens | |
91 | the file by splitting the buffer allocation operation and VFS | |
92 | opening (a dup operation may run when a file is still pending | |
93 | 'install' on VFS). */ | |
94 | if (__dup3 (_IO_fileno (result), fd, | |
95 | (result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0 | |
96 | ? O_CLOEXEC : 0) == -1) | |
97 | { | |
98 | _IO_file_close_it (result); | |
99 | result = NULL; | |
100 | goto end; | |
101 | } | |
94b7cc37 UD |
102 | __close (_IO_fileno (result)); |
103 | _IO_fileno (result) = fd; | |
104 | } | |
c44a663d | 105 | } |
94b7cc37 UD |
106 | else if (fd != -1) |
107 | __close (fd); | |
f1a67a2c AZ |
108 | |
109 | end: | |
0261d33f | 110 | _IO_release_lock (fp); |
7c713e28 | 111 | return result; |
96aa2d94 | 112 | } |