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Test that errno is set to 0 at program startup

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Add new testcase elf/tst-startup-errno.c which tests that errno is set
to 0 at first ELF constructor execution and at the start of the
program's main function.

Tested for x86_64

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Aaron Merey 2024-09-19 11:11:39 -04:00
parent 35dc62de3d
commit 83fd4149ff
2 changed files with 59 additions and 0 deletions
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1
elf/Makefile
View File

@ -457,6 +457,7 @@ tests += \
tst-single_threaded-pthread \ tst-single_threaded-pthread \
tst-sonamemove-dlopen \ tst-sonamemove-dlopen \
tst-sonamemove-link \ tst-sonamemove-link \
tst-startup-errno \
tst-thrlock \ tst-thrlock \
tst-tls-dlinfo \ tst-tls-dlinfo \
tst-tls-ie \ tst-tls-ie \

58
elf/tst-startup-errno.c Normal file
View File

@ -0,0 +1,58 @@
/* 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;
}