1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)tmpfile.c 8.1 (Berkeley) 6/4/93";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include "namespace.h"
40 #include <sys/types.h>
41 #include <signal.h>
42 #include <unistd.h>
43 #include <errno.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <paths.h>
48 #include "un-namespace.h"
49 #include "libc_private.h"
50
51 FILE *
tmpfile(void)52 tmpfile(void)
53 {
54 sigset_t set, oset;
55 FILE *fp;
56 int fd, sverrno;
57 #define TRAILER "tmp.XXXXXX"
58 char *buf;
59 const char *tmpdir;
60
61 tmpdir = NULL;
62 if (issetugid() == 0)
63 tmpdir = getenv("TMPDIR");
64 if (tmpdir == NULL)
65 tmpdir = _PATH_TMP;
66
67 (void)asprintf(&buf, "%s%s%s", tmpdir,
68 (tmpdir[strlen(tmpdir) - 1] == '/') ? "" : "/", TRAILER);
69 if (buf == NULL)
70 return (NULL);
71
72 sigfillset(&set);
73 (void)__libc_sigprocmask(SIG_BLOCK, &set, &oset);
74
75 fd = mkstemp(buf);
76 if (fd != -1)
77 (void)unlink(buf);
78
79 free(buf);
80
81 (void)__libc_sigprocmask(SIG_SETMASK, &oset, NULL);
82
83 if (fd == -1)
84 return (NULL);
85
86 if ((fp = fdopen(fd, "w+")) == NULL) {
87 sverrno = errno;
88 (void)_close(fd);
89 errno = sverrno;
90 return (NULL);
91 }
92 return (fp);
93 }
94