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)
34static 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
51FILE *
52tmpfile(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