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b9ab448f98
[BZ 15846] As discussed in the recent thread on my $EXEC_ORIGIN patch and in BZ 15846, getauxval() presently has no unambiguous way of reporting an error condition. It currently returns zero on error, but this may also be a valid result for some auxv entries. As there is no clear invalid result for all current and future auxv entries, this patch sets errno (following a suggestion in the BZ entry). This version of the patch also adds documentation and tests for the value-not-found conditions in getauxval().
37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* Access to the auxiliary vector.
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Copyright (C) 2012-2013 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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#ifndef _SYS_AUXV_H
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#define _SYS_AUXV_H 1
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#include <elf.h>
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#include <sys/cdefs.h>
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#include <bits/hwcap.h>
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__BEGIN_DECLS
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/* Return the value associated with an Elf*_auxv_t type from the auxv list
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passed to the program on startup. If TYPE was not present in the auxv
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list, returns zero and sets errno to ENOENT. */
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extern unsigned long int getauxval (unsigned long int __type)
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__THROW;
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__END_DECLS
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#endif /* sys/auxv.h */
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