1*26ba8048Schristos /* $NetBSD: putenv.c,v 1.21 2015/01/20 18:31:25 christos Exp $ */
26dda330eSthorpej
361f28255Scgd /*-
45f8a6c06Sperry * Copyright (c) 1988, 1993
55f8a6c06Sperry * The Regents of the University of California. All rights reserved.
661f28255Scgd *
761f28255Scgd * Redistribution and use in source and binary forms, with or without
861f28255Scgd * modification, are permitted provided that the following conditions
961f28255Scgd * are met:
1061f28255Scgd * 1. Redistributions of source code must retain the above copyright
1161f28255Scgd * notice, this list of conditions and the following disclaimer.
1261f28255Scgd * 2. Redistributions in binary form must reproduce the above copyright
1361f28255Scgd * notice, this list of conditions and the following disclaimer in the
1461f28255Scgd * documentation and/or other materials provided with the distribution.
15eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors
1661f28255Scgd * may be used to endorse or promote products derived from this software
1761f28255Scgd * without specific prior written permission.
1861f28255Scgd *
1961f28255Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2061f28255Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2161f28255Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2261f28255Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2361f28255Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2461f28255Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2561f28255Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2661f28255Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2761f28255Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2861f28255Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2961f28255Scgd * SUCH DAMAGE.
3061f28255Scgd */
3161f28255Scgd
32bd906777Schristos #include <sys/cdefs.h>
3361f28255Scgd #if defined(LIBC_SCCS) && !defined(lint)
346dda330eSthorpej #if 0
355f8a6c06Sperry static char sccsid[] = "@(#)putenv.c 8.2 (Berkeley) 3/27/94";
366dda330eSthorpej #else
37*26ba8048Schristos __RCSID("$NetBSD: putenv.c,v 1.21 2015/01/20 18:31:25 christos Exp $");
386dda330eSthorpej #endif
3961f28255Scgd #endif /* LIBC_SCCS and not lint */
4061f28255Scgd
4143fa6fe3Sjtc #include "namespace.h"
42b48252f3Slukem
43b48252f3Slukem #include <assert.h>
44b48252f3Slukem #include <errno.h>
4561f28255Scgd #include <stdlib.h>
4661f28255Scgd #include <string.h>
47fbf4aa16Stron
48fbf4aa16Stron #include "env.h"
497acc3301Schristos #include "local.h"
5061f28255Scgd
5161f28255Scgd int
putenv(char * str)527acc3301Schristos putenv(char *str)
5361f28255Scgd {
54fbf4aa16Stron size_t l_name;
55fbf4aa16Stron int rv;
5661f28255Scgd
57b48252f3Slukem _DIAGASSERT(str != NULL);
58b48252f3Slukem
59fbf4aa16Stron l_name = __envvarnamelen(str, true);
60fbf4aa16Stron if (l_name == 0) {
615d635760Snjoly errno = EINVAL;
627acc3301Schristos return -1;
635d635760Snjoly }
647acc3301Schristos
65fbf4aa16Stron rv = -1;
66fbf4aa16Stron if (__writelockenv()) {
67fbf4aa16Stron ssize_t offset;
687acc3301Schristos
69fbf4aa16Stron offset = __getenvslot(str, l_name, true);
70fbf4aa16Stron if (offset != -1) {
71fbf4aa16Stron if (environ[offset] != NULL)
72fbf4aa16Stron __freeenvvar(environ[offset]);
73fbf4aa16Stron environ[offset] = str;
747acc3301Schristos
75fbf4aa16Stron rv = 0;
7612c10b36Stron }
777acc3301Schristos
78fbf4aa16Stron (void)__unlockenv();
79fbf4aa16Stron }
80fbf4aa16Stron
81fbf4aa16Stron return rv;
8261f28255Scgd }
83