1 /* Copyright (C) 1991, 1993, 1996, 1997, 1998 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
8
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
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 see <http://www.gnu.org/licenses/>. */
17
18 #include <features.h>
19 #include <stdio.h>
20 #include <sys/stat.h>
21 #include <unistd.h>
22 #include "../misc/internals/tempname.h"
23 #include <not-cancel.h>
24
25
26 /* This returns a new stream opened on a temporary file (generated
27 by tmpnam). The file is opened with mode "w+b" (binary read/write).
28 If we couldn't generate a unique filename or the file couldn't
29 be opened, NULL is returned. */
tmpfile(void)30 FILE * tmpfile (void)
31 {
32 char buf[FILENAME_MAX];
33 int fd;
34 FILE *f;
35
36 if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
37 return NULL;
38 fd = __gen_tempname (buf, __GT_FILE, S_IRUSR | S_IWUSR);
39 if (fd < 0)
40 return NULL;
41
42 /* Note that this relies on the Unix semantics that
43 a file is not really removed until it is closed. */
44 (void) remove (buf);
45
46 if ((f = fdopen (fd, "w+b")) == NULL)
47 close_not_cancel (fd);
48
49 return f;
50 }
51 #ifdef __UCLIBC_HAS_LFS__
52 strong_alias(tmpfile,tmpfile64)
53 #endif
54