67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/***********************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 2001 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../../LICENSE. */
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/* */
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/***********************************************************************/
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#include <stdio.h>
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#include <signal.h>
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#include <sys/resource.h>
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static char sig_alt_stack[SIGSTKSZ];
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static char * system_stack_top;
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#if defined(TARGET_i386) && defined(SYS_linux_elf)
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static void segv_handler(int signo, struct sigcontext sc)
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{
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char * fault_addr = (char *) sc.cr2;
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#else
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static void segv_handler(int signo, siginfo_t * info, void * context)
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{
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char * fault_addr = (char *) info->si_addr;
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#endif
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struct rlimit limit;
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if (getrlimit(RLIMIT_STACK, &limit) == 0 &&
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((long) fault_addr & (sizeof(long) - 1)) == 0 &&
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fault_addr < system_stack_top &&
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fault_addr >= system_stack_top - limit.rlim_cur - 0x2000) {
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_exit(0);
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} else {
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_exit(4);
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}
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}
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int main(int argc, char ** argv)
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{
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stack_t stk;
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struct sigaction act;
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stk.ss_sp = sig_alt_stack;
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stk.ss_size = SIGSTKSZ;
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stk.ss_flags = 0;
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#if defined(TARGET_i386) && defined(SYS_linux_elf)
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act.sa_handler = (void (*)(int)) segv_handler;
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act.sa_flags = SA_ONSTACK | SA_NODEFER;
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#else
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act.sa_sigaction = segv_handler;
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act.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_NODEFER;
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#endif
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sigemptyset(&act.sa_mask);
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system_stack_top = (char *) &act;
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if (sigaltstack(&stk, NULL) != 0) { perror("sigaltstack"); return 2; }
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if (sigaction(SIGSEGV, &act, NULL) != 0) { perror("sigaction"); return 2; }
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/* We used to trigger a stack overflow at this point to test whether
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the code above works, but this causes problems with POSIX threads
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on some BSD systems. So, instead, we just test that all this
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code compiles, indicating that the required syscalls are there. */
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return 0;
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}
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