aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/generic/setenv.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/generic/setenv.c')
-rw-r--r--sysdeps/generic/setenv.c92
1 files changed, 60 insertions, 32 deletions
diff --git a/sysdeps/generic/setenv.c b/sysdeps/generic/setenv.c
index 44830e9aa7..9403ccb035 100644
--- a/sysdeps/generic/setenv.c
+++ b/sysdeps/generic/setenv.c
@@ -1,52 +1,57 @@
/* Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+ This file is part of the GNU C Library.
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#ifdef HAVE_CONFIG_H
-#include <config.h>
+#if HAVE_CONFIG_H
+# include <config.h>
#endif
#include <errno.h>
#if _LIBC || HAVE_STDLIB_H
-#include <stdlib.h>
+# include <stdlib.h>
#endif
#if _LIBC || HAVE_STRING_H
-#include <string.h>
+# include <string.h>
#endif
#if _LIBC || HAVE_UNISTD_H
-#include <unistd.h>
+# include <unistd.h>
#endif
#if _LIBC - 0 == 0
-#define __environ environ
+# define __environ environ
#endif
#if _LIBC - 0
/* This lock protects against simultaneous modifications of `environ'. */
-#include <libc-lock.h>
+# include <libc-lock.h>
__libc_lock_define_initialized (static, envlock)
-#define LOCK __libc_lock_lock (envlock)
-#define UNLOCK __libc_lock_unlock (envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
#else
-#define LOCK
-#define UNLOCK
+# define LOCK
+# define UNLOCK
#endif
+/* If this variable is not a null pointer we allocated the current
+ environment. */
+static char **last_environ;
+
+
int
setenv (name, value, replace)
const char *name;
@@ -61,17 +66,17 @@ setenv (name, value, replace)
LOCK;
size = 0;
- for (ep = __environ; *ep != NULL; ++ep)
- if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
- break;
- else
- ++size;
+ if (__environ != NULL)
+ for (ep = __environ; *ep != NULL; ++ep)
+ if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
+ break;
+ else
+ ++size;
- if (*ep == NULL)
+ if (__environ == NULL || *ep == NULL)
{
- static char **last_environ;
char **new_environ;
- if (__environ == last_environ)
+ if (__environ == last_environ && __environ != NULL)
/* We allocated this space; we can extend it. */
new_environ = (char **) realloc (last_environ,
(size + 2) * sizeof (char *));
@@ -151,3 +156,26 @@ unsetenv (name)
UNLOCK;
}
+
+/* The `clearenv' was planned to be added to POSIX.1 but probably
+ never made it. Nevertheless the POSIX.9 standard (POSIX bindings
+ for Fortran 77) requires this function. */
+int
+clearenv ()
+{
+ LOCK;
+
+ if (__environ == last_environ && __environ != NULL)
+ {
+ /* We allocated this environment so we can free it. */
+ free (__environ);
+ last_environ = NULL;
+ }
+
+ /* Clear the environment pointer removes the whole environment. */
+ __environ = NULL;
+
+ UNLOCK;
+
+ return 0;
+}