1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)tmpfile.c 8.1 (Berkeley) 6/4/93"; 37 #endif /* LIBC_SCCS and not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include "namespace.h" 42 #include <sys/types.h> 43 #include <signal.h> 44 #include <unistd.h> 45 #include <errno.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <paths.h> 50 #include "un-namespace.h" 51 #include "libc_private.h" 52 53 FILE * 54 tmpfile(void) 55 { 56 sigset_t set, oset; 57 FILE *fp; 58 int fd, sverrno; 59 #define TRAILER "tmp.XXXXXX" 60 char *buf; 61 const char *tmpdir; 62 63 tmpdir = NULL; 64 if (issetugid() == 0) 65 tmpdir = getenv("TMPDIR"); 66 if (tmpdir == NULL) 67 tmpdir = _PATH_TMP; 68 69 (void)asprintf(&buf, "%s%s%s", tmpdir, 70 (tmpdir[strlen(tmpdir) - 1] == '/') ? "" : "/", TRAILER); 71 if (buf == NULL) 72 return (NULL); 73 74 sigfillset(&set); 75 (void)__libc_sigprocmask(SIG_BLOCK, &set, &oset); 76 77 fd = mkstemp(buf); 78 if (fd != -1) 79 (void)unlink(buf); 80 81 free(buf); 82 83 (void)__libc_sigprocmask(SIG_SETMASK, &oset, NULL); 84 85 if (fd == -1) 86 return (NULL); 87 88 if ((fp = fdopen(fd, "w+")) == NULL) { 89 sverrno = errno; 90 (void)_close(fd); 91 errno = sverrno; 92 return (NULL); 93 } 94 return (fp); 95 } 96