glibc/stdlib/tst-putenvmod.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
void
__attribute ((constructor))
init (void)
{
puts ("init DSO");
static char str[] = "SOMETHING_NOBODY_USES=something_else";
if (putenv (str) != 0)
{
puts ("putenv failed");
_exit (1);
}
}