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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().
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* 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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#include <sys/auxv.h>
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#include <errno.h>
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#include <ldsodefs.h>
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unsigned long int
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__getauxval (unsigned long int type)
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{
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ElfW(auxv_t) *p;
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if (type == AT_HWCAP)
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return GLRO(dl_hwcap);
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else if (type == AT_HWCAP2)
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return GLRO(dl_hwcap2);
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for (p = GLRO(dl_auxv); p->a_type != AT_NULL; p++)
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if (p->a_type == type)
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return p->a_un.a_val;
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__set_errno (ENOENT);
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return 0;
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}
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weak_alias (__getauxval, getauxval)
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