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 * @(#)tmpfile.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/tmpfile.c,v 1.10 2007/01/09 00:28:07 imp Exp $ 34 * $DragonFly: src/lib/libc/stdio/tmpfile.c,v 1.4 2005/11/20 11:07:30 swildner Exp $ 35 */ 36 37 #include "namespace.h" 38 #include <sys/types.h> 39 #include <signal.h> 40 #include <unistd.h> 41 #include <errno.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <paths.h> 46 #include "un-namespace.h" 47 48 FILE * 49 tmpfile(void) 50 { 51 sigset_t set, oset; 52 FILE *fp; 53 int fd, sverrno; 54 #define TRAILER "tmp.XXXXXX" 55 char *buf; 56 const char *tmpdir; 57 58 tmpdir = NULL; 59 if (issetugid() == 0) 60 tmpdir = getenv("TMPDIR"); 61 if (tmpdir == NULL) 62 tmpdir = _PATH_TMP; 63 64 asprintf(&buf, "%s%s%s", tmpdir, 65 (tmpdir[strlen(tmpdir) - 1] == '/') ? "" : "/", TRAILER); 66 if (buf == NULL) 67 return (NULL); 68 69 sigfillset(&set); 70 _sigprocmask(SIG_BLOCK, &set, &oset); 71 72 fd = mkstemp(buf); 73 if (fd != -1) 74 unlink(buf); 75 76 free(buf); 77 78 _sigprocmask(SIG_SETMASK, &oset, NULL); 79 80 if (fd == -1) 81 return (NULL); 82 83 if ((fp = fdopen(fd, "w+")) == NULL) { 84 sverrno = errno; 85 _close(fd); 86 errno = sverrno; 87 return (NULL); 88 } 89 return (fp); 90 } 91