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1 | /* Open a stdio stream on an anonymous temporary file. Generic/POSIX version. | |
2 | Copyright (C) 1991-2018 Free Software Foundation, Inc. | |
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 | |
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. | |
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fcntl.h> | |
20 | #include <stdio.h> | |
21 | #include <unistd.h> | |
22 | ||
23 | #include <iolibio.h> | |
24 | #define __fdopen _IO_fdopen | |
25 | #ifndef tmpfile | |
26 | # define tmpfile __new_tmpfile | |
27 | #endif | |
28 | ||
29 | ||
30 | /* This returns a new stream opened on a temporary file (generated | |
31 | by tmpnam). The file is opened with mode "w+b" (binary read/write). | |
32 | If we couldn't generate a unique filename or the file couldn't | |
33 | be opened, NULL is returned. */ | |
34 | FILE * | |
35 | tmpfile (void) | |
36 | { | |
37 | int fd; | |
38 | FILE *f; | |
39 | int flags = 0; | |
40 | #ifdef FLAGS | |
41 | flags = FLAGS; | |
42 | #endif | |
43 | ||
44 | /* First try a system specific method. */ | |
45 | fd = __gen_tempfd (flags); | |
46 | ||
47 | if (fd < 0) | |
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; | |
57 | ||
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 | } | |
62 | ||
63 | if ((f = __fdopen (fd, "w+b")) == NULL) | |
64 | __close (fd); | |
65 | ||
66 | return f; | |
67 | } | |
68 | ||
69 | #if !defined O_LARGEFILE || O_LARGEFILE == 0 | |
70 | weak_alias (__new_tmpfile, tmpfile64) | |
71 | #endif | |
72 | ||
73 | #ifndef FLAGS /* Not for tmpfile64. */ | |
74 | # undef tmpfile | |
75 | # include <shlib-compat.h> | |
76 | versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1); | |
77 | #endif |