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 rcsid[] = "$OpenBSD: tmpfile.c,v 1.8 2004/09/28 18:12:44 otto Exp $"; 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <unistd.h> 40 #include <signal.h> 41 #include <errno.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <paths.h> 45 46 FILE * 47 tmpfile(void) 48 { 49 sigset_t set, oset; 50 FILE *fp; 51 int fd, sverrno; 52 #define TRAILER "tmp.XXXXXXXXXX" 53 char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)]; 54 55 (void)memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1); 56 (void)memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER)); 57 58 sigfillset(&set); 59 (void)sigprocmask(SIG_BLOCK, &set, &oset); 60 61 fd = mkstemp(buf); 62 if (fd != -1) { 63 mode_t u; 64 65 (void)unlink(buf); 66 u = umask(0); 67 (void)umask(u); 68 (void)fchmod(fd, 0666 & ~u); 69 } 70 71 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 72 73 if (fd == -1) 74 return (NULL); 75 76 if ((fp = fdopen(fd, "w+")) == NULL) { 77 sverrno = errno; 78 (void)close(fd); 79 errno = sverrno; 80 return (NULL); 81 } 82 return (fp); 83 } 84