1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 /* 34 * tmpfile - return a pointer to an update file that can be 35 * used for scratch. The file will automatically 36 * go away if the program using it terminates. 37 */ 38 39 #include "synonyms.h" 40 #include "mtlib.h" 41 #include <sys/types.h> 42 #include <unistd.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <stdlib.h> 46 #include <thread.h> 47 #include <synch.h> 48 #include <sys/stat.h> 49 50 static char seed[] = { 'a', 'a', 'a', '\0' }; 51 static mutex_t seed_lk = DEFAULTMUTEX; 52 53 #define XS "\bXXXXXX" /* a '\b' character is prepended to this */ 54 /* string to avoid conflicts with names */ 55 /* generated by tmpnam() */ 56 /*ARGSUSED*/ 57 static FILE * 58 _common(boolean_t large_file) 59 { 60 char tfname[L_tmpnam]; 61 FILE *p; 62 char *q; 63 int mkret; 64 mode_t current_umask; 65 66 (void) strcpy(tfname, P_tmpdir); 67 lmutex_lock(&seed_lk); 68 (void) strcat(tfname, seed); 69 (void) strcat(tfname, XS); 70 71 q = seed; 72 while (*q == 'z') 73 *q++ = 'a'; 74 if (*q != '\0') 75 ++*q; 76 lmutex_unlock(&seed_lk); 77 78 #if !defined(_LP64) 79 if (large_file == B_TRUE) { 80 if ((mkret = mkstemp64(tfname)) == -1) 81 return (NULL); 82 } else 83 #endif 84 if ((mkret = mkstemp(tfname)) == -1) 85 return (NULL); 86 87 (void) unlink(tfname); 88 current_umask = umask(0777); 89 (void) umask(current_umask); 90 (void) fchmod(mkret, 0666 & ~current_umask); 91 if ((p = fdopen(mkret, "w+")) == NULL) { 92 (void) close(mkret); 93 return (NULL); 94 } 95 96 return (p); 97 } 98 99 #if !defined(_LP64) 100 FILE * 101 tmpfile64(void) 102 { 103 return (_common(B_TRUE)); 104 } 105 #endif /* _LP64 */ 106 107 /* 108 * This is a bit confusing -- some explanation is in order. 109 * 110 * When we're compiled 64-bit, there's no point in distinguishing 111 * a "large" file from a "small" file -- they're all "large". 112 * The argument we pass to '_common' is ignored -- we always call 113 * mkstemp which will just do the right thing for us. 114 */ 115 FILE * 116 tmpfile(void) 117 { 118 return (_common(B_FALSE)); 119 } 120