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Commit | Line | Data |
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27114e20 | 1 | /* Open a stdio stream on an anonymous temporary file. Generic/POSIX version. |
04277e02 | 2 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
f8b87ef0 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
f8b87ef0 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
f8b87ef0 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 18 | |
d7e23b02 | 19 | #include <fcntl.h> |
28f540f4 | 20 | #include <stdio.h> |
9fbffc46 | 21 | #include <unistd.h> |
28f540f4 | 22 | |
3ce1f295 | 23 | #include <iolibio.h> |
d18ea0c5 | 24 | #define __fdopen _IO_fdopen |
3ce1f295 UD |
25 | #ifndef tmpfile |
26 | # define tmpfile __new_tmpfile | |
7cabd57c | 27 | #endif |
28f540f4 | 28 | |
337738b7 | 29 | |
28f540f4 | 30 | /* This returns a new stream opened on a temporary file (generated |
7ce241a0 | 31 | by tmpnam). The file is opened with mode "w+b" (binary read/write). |
28f540f4 RM |
32 | If we couldn't generate a unique filename or the file couldn't |
33 | be opened, NULL is returned. */ | |
34 | FILE * | |
7ce241a0 | 35 | tmpfile (void) |
28f540f4 | 36 | { |
7cabd57c | 37 | int fd; |
28f540f4 | 38 | FILE *f; |
d7e23b02 UD |
39 | int flags = 0; |
40 | #ifdef FLAGS | |
41 | flags = FLAGS; | |
42 | #endif | |
e0d2eb5a AZ |
43 | |
44 | /* First try a system specific method. */ | |
45 | fd = __gen_tempfd (flags); | |
46 | ||
7ce241a0 | 47 | if (fd < 0) |
e0d2eb5a AZ |
48 | { |
49 | char buf[FILENAME_MAX]; | |
50 | ||
51 | if (__path_search (buf, sizeof buf, NULL, "tmpf", 0)) | |
52 | return NULL; | |
53 | ||
54 | fd = __gen_tempname (buf, 0, flags, __GT_FILE); | |
55 | if (fd < 0) | |
56 | return NULL; | |
28f540f4 | 57 | |
e0d2eb5a AZ |
58 | /* Note that this relies on the Unix semantics that |
59 | a file is not really removed until it is closed. */ | |
60 | (void) __unlink (buf); | |
61 | } | |
7cabd57c | 62 | |
7ce241a0 UD |
63 | if ((f = __fdopen (fd, "w+b")) == NULL) |
64 | __close (fd); | |
28f540f4 RM |
65 | |
66 | return f; | |
67 | } | |
7ce241a0 | 68 | |
bea9b193 RM |
69 | #if !defined O_LARGEFILE || O_LARGEFILE == 0 |
70 | weak_alias (__new_tmpfile, tmpfile64) | |
71 | #endif | |
72 | ||
3ce1f295 | 73 | #ifndef FLAGS /* Not for tmpfile64. */ |
7ce241a0 | 74 | # undef tmpfile |
9010d7f8 RM |
75 | # include <shlib-compat.h> |
76 | versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1); | |
7ce241a0 | 77 | #endif |