mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-03 10:05:29 +00:00
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/mman.h>
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void sig_handler(int sig){
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int var;
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fprintf(stderr, "caught signal, local var is on %p\n", &var);
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}
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int main(int argv, char** argc) {
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int res, i;
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stack_t sigstk;
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struct sigaction act;
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static const int size = SIGSTKSZ*2;
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char *stk = (char *)mmap(0, size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0);
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sigstk.ss_sp = stk;
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sigstk.ss_size = size;
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sigstk.ss_flags = 0;
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fprintf(stderr, "calling sigaltstack, stack base is %p\n", sigstk.ss_sp);
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if (sigaltstack(&sigstk,0)<0) perror("sigaltstack");
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fprintf(stderr,"setting sigaction\n");
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act.sa_flags=SA_ONSTACK;
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act.sa_handler=&sig_handler;
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sigemptyset(&act.sa_mask);
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res = sigaction(SIGUSR1,&act,0);
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fprintf(stderr, "res = %d\n", res);
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fprintf(stderr, "raising the signal\n");
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raise(SIGUSR1);
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/* Loop long enough so valgrind has a forced context switch and
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actually delivers the signal before the thread exits. */
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for (i = 0; i < 1000000; i++) ;
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fprintf(stderr, "done\n");
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return 0;
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}
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