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/* Test the value of errno at program startup.
Copyright (C) 2024 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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
/* Verify that errno is 0 at first ELF constructor execution and at
the start of main. */
static void set_ctor_errno (void) __attribute__((constructor));
static int ctor_errno = -1;
static void
set_ctor_errno (void)
{
ctor_errno = errno;
}
static int
get_ctor_errno (void)
{
return ctor_errno;
}
int
main (void)
{
if (errno != 0)
{
printf ("At start of main errno set to %d != 0\n", errno);
exit (1);
}
if (get_ctor_errno () != 0)
{
printf ("At ctor exec errno set to %d != 0\n", get_ctor_errno ());
exit (1);
}
return 0;
}
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