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 * 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
