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libexec/rtld-elf/rtld-libc/rtld_libc.c
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/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause | |||||
* | |||||
* Copyright 2019 Alex Richadson <arichardson@FreeBSD.org> | |||||
* | |||||
* This software was developed by SRI International and the University of | |||||
* Cambridge Computer Laboratory (Department of Computer Science and | |||||
* Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the | |||||
* DARPA SSITH research programme. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
#include <sys/param.h> | |||||
#include <sys/types.h> | |||||
#include <sys/sysctl.h> | |||||
#include <assert.h> | |||||
#include <signal.h> | |||||
#include <stdarg.h> | |||||
#include <stdlib.h> | |||||
#include <string.h> | |||||
#include <stdio.h> | |||||
#include "rtld.h" | |||||
#include "rtld_printf.h" | |||||
#include "rtld_libc.h" | |||||
/* | |||||
* Avoid dependencies from various libc calls on abort(). Since this is only | |||||
* used for assertions in RTLD, we can just raise SIGABRT directly. | |||||
*/ | |||||
void | |||||
abort(void) | |||||
{ | |||||
raise(SIGABRT); | |||||
__builtin_trap(); | |||||
} | |||||
static int rtld_errno; | |||||
int *__error(void); | |||||
int * | |||||
__error(void) | |||||
{ | |||||
return (&rtld_errno); | |||||
} | |||||
/* Avoid dependency on __libc_interposing, use the system call directly. */ | |||||
#undef sigprocmask | |||||
int | |||||
sigprocmask(int how, const sigset_t *set, sigset_t *oset) | |||||
{ | |||||
return (__sys_sigprocmask(how, set, oset)); | |||||
} | |||||
__strong_reference(sigprocmask, __libc_sigprocmask); | |||||
#if defined DEBUG || !defined(NDEBUG) | |||||
/* Provide an implementation of __assert that does not pull in fprintf() */ | |||||
void | |||||
__assert(const char *func, const char *file, int line, const char *failedexpr) | |||||
{ | |||||
if (func == NULL) | |||||
(void)rtld_fdprintf(STDERR_FILENO, | |||||
"Assertion failed: (%s), file %s, line %d.\n", failedexpr, | |||||
file, line); | |||||
else | |||||
(void)rtld_fdprintf(STDERR_FILENO, | |||||
"Assertion failed: (%s), function %s, file %s, line %d.\n", | |||||
failedexpr, func, file, line); | |||||
abort(); | |||||
/* NOTREACHED */ | |||||
} | |||||
#endif | |||||
/* | |||||
* Avoid pulling in all of pthreads from getpagesize(). | |||||
* It normally uses libc/gen/auxv.c which pulls in pthread_once(). | |||||
*/ | |||||
int | |||||
getpagesize(void) | |||||
{ | |||||
int mib[2]; | |||||
int value; | |||||
size_t size; | |||||
kib: mib and value can be defined on the same line. | |||||
static int pagesize; | |||||
Done Inline ActionsNo need for this blank line. kib: No need for this blank line. | |||||
if (pagesize != 0) | |||||
return (pagesize); | |||||
if (npagesizes > 0) | |||||
pagesize = pagesizes[0]; | |||||
if (pagesize == 0) { | |||||
mib[0] = CTL_HW; | |||||
mib[1] = HW_PAGESIZE; | |||||
size = sizeof(value); | |||||
if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) == -1) | |||||
pagesize = PAGE_SIZE; | |||||
else | |||||
pagesize = value; | |||||
} | |||||
return (pagesize); | |||||
} |
mib and value can be defined on the same line.