1 /* $NetBSD: putenv.c,v 1.17 2010/10/25 20:35:36 njoly Exp $ */ 2 3 /*- 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)putenv.c 8.2 (Berkeley) 3/27/94"; 36 #else 37 __RCSID("$NetBSD: putenv.c,v 1.17 2010/10/25 20:35:36 njoly Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 43 #include <assert.h> 44 #include <errno.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include "reentrant.h" 48 #include "local.h" 49 50 #ifdef __weak_alias 51 __weak_alias(putenv,_putenv) 52 #endif 53 54 int 55 putenv(char *str) 56 { 57 char *p; 58 int offset; 59 60 _DIAGASSERT(str != NULL); 61 62 if (str == NULL || strchr(str, '=') == NULL || *str == '=') { 63 errno = EINVAL; 64 return -1; 65 } 66 67 if (rwlock_wrlock(&__environ_lock) != 0) 68 return -1; 69 70 p = __findenv(str, &offset); 71 72 if (__allocenv(offset) == -1) 73 goto bad; 74 75 if (p != NULL && environ[offset] == __environ_malloced[offset]) { 76 free(__environ_malloced[offset]); 77 __environ_malloced[offset] = NULL; 78 } 79 80 environ[offset] = str; 81 rwlock_unlock(&__environ_lock); 82 return 0; 83 bad: 84 rwlock_unlock(&__environ_lock); 85 return -1; 86 } 87