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glibc  2.9
environ.c
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00001 /* This file just defines the `__environ' variable (and alias `environ').  */
00002 
00003 #include <unistd.h>
00004 #include <stddef.h>
00005 
00006 /* This must be initialized; we cannot have a weak alias into bss.  */
00007 char **__environ = NULL;
00008 weak_alias (__environ, environ)
00009 
00010 /* The SVR4 ABI says `_environ' will be the name to use
00011    in case the user overrides the weak alias `environ'.  */
00012 weak_alias (__environ, _environ)