1 | /* Open a stdio stream on an anonymous temporary file. Generic/POSIX version. |
2 | Copyright (C) 1991-2017 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 | char buf[FILENAME_MAX]; |
38 | int fd; |
39 | FILE *f; |
40 | |
41 | if (__path_search (buf, FILENAME_MAX, NULL, "tmpf" , 0)) |
42 | return NULL; |
43 | int flags = 0; |
44 | #ifdef FLAGS |
45 | flags = FLAGS; |
46 | #endif |
47 | fd = __gen_tempname (buf, 0, flags, __GT_FILE); |
48 | if (fd < 0) |
49 | return NULL; |
50 | |
51 | /* Note that this relies on the Unix semantics that |
52 | a file is not really removed until it is closed. */ |
53 | (void) __unlink (buf); |
54 | |
55 | if ((f = __fdopen (fd, "w+b" )) == NULL) |
56 | __close (fd); |
57 | |
58 | return f; |
59 | } |
60 | |
61 | #if !defined O_LARGEFILE || O_LARGEFILE == 0 |
62 | weak_alias (__new_tmpfile, tmpfile64) |
63 | #endif |
64 | |
65 | #ifndef FLAGS /* Not for tmpfile64. */ |
66 | # undef tmpfile |
67 | # include <shlib-compat.h> |
68 | versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1); |
69 | #endif |
70 | |