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2efca218b5
When testing nptl/tst-pthread-attr-affinity-fail fails with:
error: xsysconf.c:33: sysconf (83): Cannot allocate memory
error: 1 test failures
This happens as xsysconf checks the errno after running sysconf.
Internally the sysconf request for _SC_NPROCESSORS_CONF on linux
allocates memory. But there is a problem, even though malloc succeeds
errno is getting set to ENOMEM.
POSIX allows successful calls to clobber errno. So xsysconf just
checking errno is wrong. Fix xsysconf by only failing if we have an
error result and errno is set.
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* Error-checking wrapper for sysconf.
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Copyright (C) 2017-2021 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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long
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xsysconf (int name)
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{
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/* Detect errors by a changed errno value, in case -1 is a valid
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value. Make sure that the caller does not see the zero value for
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errno. */
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int old_errno = errno;
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errno = 0;
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long result = sysconf (name);
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if (result == -1 && errno != 0)
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FAIL_EXIT1 ("sysconf (%d): %m", name);
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errno = old_errno;
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return result;
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}
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