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62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
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/* BZ #24024 strerror and errno test.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <errno.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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/* malloc is allowed to change errno to a value different than 0, even when
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there is no actual error. This happens for example when the memory
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allocation through sbrk fails. Simulate this by interposing our own
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malloc implementation which sets errno to ENOMEM and calls the original
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malloc. */
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void
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*malloc (size_t size)
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{
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static void *(*real_malloc) (size_t size);
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if (!real_malloc)
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real_malloc = dlsym (RTLD_NEXT, "malloc");
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errno = ENOMEM;
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return (*real_malloc) (size);
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}
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/* strerror must not change the value of errno. Unfortunately due to GCC bug
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#88576, this happens when -fmath-errno is used. This simple test checks
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that it doesn't happen. */
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static int
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do_test (void)
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{
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char *msg;
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errno = 0;
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msg = strerror (-3);
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(void) msg;
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TEST_COMPARE (errno, 0);
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return 0;
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}
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#include <support/test-driver.c>
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