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 * 4. 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 50 FILE * 51 tmpfile() 52 { 53 sigset_t set, oset; 54 FILE *fp; 55 int fd, sverrno; 56 #define TRAILER "tmp.XXXXXX" 57 char *buf; 58 const char *tmpdir; 59 60 tmpdir = NULL; 61 if (issetugid() == 0) 62 tmpdir = getenv("TMPDIR"); 63 if (tmpdir == NULL) 64 tmpdir = _PATH_TMP; 65 66 (void)asprintf(&buf, "%s%s%s", tmpdir, 67 (tmpdir[strlen(tmpdir) - 1] == '/') ? "" : "/", TRAILER); 68 if (buf == NULL) 69 return (NULL); 70 71 sigfillset(&set); 72 (void)_sigprocmask(SIG_BLOCK, &set, &oset); 73 74 fd = mkstemp(buf); 75 if (fd != -1) 76 (void)unlink(buf); 77 78 free(buf); 79 80 (void)_sigprocmask(SIG_SETMASK, &oset, NULL); 81 82 if (fd == -1) 83 return (NULL); 84 85 if ((fp = fdopen(fd, "w+")) == NULL) { 86 sverrno = errno; 87 (void)_close(fd); 88 errno = sverrno; 89 return (NULL); 90 } 91 return (fp); 92 } 93