mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
|
/* Environment handling for dynamic loader.
|
||
|
|
Copyright (C) 1995-1998, 2000, 2001, 2002 Free Software Foundation, Inc.
|
||
|
|
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 Lesser General Public
|
||
|
|
License as published by the Free Software Foundation; either
|
||
|
|
version 2.1 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
|
||
|
|
Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public
|
||
|
|
License along with the GNU C Library; if not, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <ldsodefs.h>
|
||
|
|
|
||
|
|
/* Walk through the environment of the process and return all entries
|
||
|
|
starting with `LD_'. */
|
||
|
|
char *
|
||
|
|
internal_function
|
||
|
|
_dl_next_ld_env_entry (char ***position)
|
||
|
|
{
|
||
|
|
char **current = *position;
|
||
|
|
char *result = NULL;
|
||
|
|
|
||
|
|
while (*current != NULL)
|
||
|
|
{
|
||
|
|
if (__builtin_expect ((*current)[0] == 'L', 0)
|
||
|
|
&& (*current)[1] == 'D' && (*current)[2] == '_')
|
||
|
|
{
|
||
|
|
result = &(*current)[3];
|
||
|
|
|
||
|
|
/* Save current position for next visit. */
|
||
|
|
*position = ++current;
|
||
|
|
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
++current;
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* In ld.so __environ is not exported. */
|
||
|
|
extern char **__environ attribute_hidden;
|
||
|
|
|
||
|
|
int
|
||
|
|
unsetenv (const char *name)
|
||
|
|
{
|
||
|
|
char **ep;
|
||
|
|
|
||
|
|
ep = __environ;
|
||
|
|
while (*ep != NULL)
|
||
|
|
{
|
||
|
|
size_t cnt = 0;
|
||
|
|
|
||
|
|
while ((*ep)[cnt] == name[cnt] && name[cnt] != '\0')
|
||
|
|
++cnt;
|
||
|
|
|
||
|
|
if (name[cnt] == '\0' && (*ep)[cnt] == '=')
|
||
|
|
{
|
||
|
|
/* Found it. Remove this pointer by moving later ones to
|
||
|
|
the front. */
|
||
|
|
char **dp = ep;
|
||
|
|
|
||
|
|
do
|
||
|
|
dp[0] = dp[1];
|
||
|
|
while (*dp++);
|
||
|
|
/* Continue the loop in case NAME appears again. */
|
||
|
|
}
|
||
|
|
else
|
||
|
|
++ep;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|