1 /* $OpenBSD: tmpfile.c,v 1.10 2005/10/10 12:00:52 espie Exp $ */
2 /*-
3 * Copyright (c) 1990, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <unistd.h>
37 #include <signal.h>
38 #include <errno.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <paths.h>
43
44 FILE *
tmpfile(void)45 tmpfile(void)
46 {
47 sigset_t set, oset;
48 FILE *fp;
49 int fd, sverrno;
50 #define TRAILER "tmp.XXXXXXXXXX"
51 char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
52
53 (void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
54 (void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));
55
56 sigfillset(&set);
57 (void)sigprocmask(SIG_BLOCK, &set, &oset);
58
59 fd = mkstemp(buf);
60 if (fd != -1) {
61 mode_t u;
62
63 (void)unlink(buf);
64 u = umask(0);
65 (void)umask(u);
66 (void)fchmod(fd, 0666 & ~u);
67 }
68
69 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
70
71 if (fd == -1)
72 return (NULL);
73
74 if ((fp = fdopen(fd, "w+")) == NULL) {
75 sverrno = errno;
76 (void)close(fd);
77 errno = sverrno;
78 return (NULL);
79 }
80 return (fp);
81 }
82