Revamp lib/roken/getauxval.c
This commit is contained in:
Nicolas Williams
committed by
Viktor Dukhovni
Viktor Dukhovni
parent
c7f54ae85a
commit
650ffdc964
157
lib/roken/getauxval.h
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157
lib/roken/getauxval.h
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/*
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* Copyright (c) 2016 - 2017 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef RK_GETAUXVAL_H
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#define RK_GETAUXVAL_H
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#include <config.h>
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#ifdef HAVE_SYS_AUXV_H
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#include <sys/auxv.h>
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#endif
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#ifndef HAVE_AUXV_T
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/*
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* Illumos defines auxv_t per the ABI standards, but all other OSes seem
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* to use { long; long; } instead, depends on sizeof(long) ==
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* sizeof(void *), and they do not define an auxv_t.
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*
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* sizeof(long) != sizeof(void *) on WIN64, but Windows doesn't have
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* /proc/self/auxv anyways. Just in case we use uintptr_t.
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*/
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typedef struct rk_auxv {
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uintptr_t a_type;
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union {
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uintptr_t a_val;
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uintptr_t a_ptr; /* This would be void * */
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uintptr_t a_fnc; /* This would be void (*)(void) */
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} a_un;
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} auxv_t;
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#endif
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#ifdef __linux__
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/*
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* Older glibcs have no <sys/auxv.h>, but do nonetheless have an ELF
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* auxiliary vector, and with the values for these types that appear in
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* <sys/auxv.h> in later versions.
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*
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* Note that Travis-CI still uses Ubuntu 14 for its Linux build
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* environment, which has such an older glibc version.
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*/
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#ifndef AT_UID
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#define AT_UID 11
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#endif
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#ifndef AT_EUID
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#define AT_EUID 12
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#endif
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#ifndef AT_GID
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#define AT_GID 13
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#endif
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#ifndef AT_EGID
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#define AT_EGID 14
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#endif
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#ifndef AT_SECURE
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#define AT_SECURE 23
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#endif
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#endif
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/* NetBSD calls AT_UID AT_RUID. Everyone else calls it AT_UID. */
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#if defined(AT_EUID) && defined(AT_RUID) && !defined(AT_UID)
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#define AT_UID AT_RUID
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#endif
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#if defined(AT_EGID) && defined(AT_RGID) && !defined(AT_GID)
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#define AT_GID AT_RGID
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#endif
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#if defined(AT_EUID) && defined(AT_UID) && !defined(AT_RUID)
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#define AT_RUID AT_UID
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#endif
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#if defined(AT_EGID) && defined(AT_GID) && !defined(AT_RGID)
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#define AT_RGID AT_GID
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#endif
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/*
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* There are three different names for the type whose value is the path
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* to the executable being run by the process.
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*/
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#if defined(AT_EXECFN) && !defined(AT_EXECPATH)
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#define AT_EXECPATH AT_EXECFN
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#endif
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#if defined(AT_EXECFN) && !defined(AT_SUN_EXECNAME)
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#define AT_SUN_EXECNAME AT_EXECFN
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#endif
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#if defined(AT_EXECPATH) && !defined(AT_EXECFN)
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#define AT_EXECFN AT_EXECPATH
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#endif
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#if defined(AT_EXECPATH) && !defined(AT_SUN_EXECNAME)
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#define AT_SUN_EXECNAME AT_EXECPATH
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#endif
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#if defined(AT_SUN_EXECNAME) && !defined(AT_EXECFN)
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#define AT_EXECFN AT_SUN_EXECNAME
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#endif
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#if defined(AT_SUN_EXECNAME) && !defined(AT_EXECPATH)
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#define AT_EXECPATH AT_SUN_EXECNAME
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#endif
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/* We need this for part of the getauxval() brokenness detection below */
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#ifdef __GLIBC__
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#ifdef __GLIBC_PREREQ
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#define HAVE_GLIBC_API_VERSION_SUPPORT(maj, min) __GLIBC_PREREQ(maj, min)
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#else
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#define HAVE_GLIBC_API_VERSION_SUPPORT(maj, min) \
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((__GLIBC << 16) + GLIBC_MINOR >= ((maj) << 16) + (min))
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#endif
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/*
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* Detect whether getauxval() is broken.
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*
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* Do change this check in order to manually test rk_getauxval() for
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* older glibcs.
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*/
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#if HAVE_GLIBC_API_VERSION_SUPPORT(2, 19)
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#define GETAUXVAL_SETS_ERRNO
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/* #else it's broken */
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#endif
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#endif
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ROKEN_LIB_FUNCTION const auxv_t * ROKEN_LIB_CALL
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rk_getauxv(unsigned long type);
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ROKEN_LIB_FUNCTION unsigned long ROKEN_LIB_CALL
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rk_getauxval(unsigned long);
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ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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rk_injectauxv(auxv_t *e);
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#endif /* RK_GETAUXVAL_H */
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