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glibc/posix/environ.c

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/* This file just defines the `__environ' variable (and alias `environ'). */
#include <unistd.h>
#include <stddef.h>
/* This must be initialized; we cannot have a weak alias into bss. */
char **__environ = NULL;
weak_alias (__environ, environ)
/* The SVR4 ABI says `_environ' will be the name to use
in case the user overrides the weak alias `environ'. */
weak_alias (__environ, _environ)