sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 1 | |
| 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <malloc.h> |
| 5 | #include <signal.h> |
fitzhardinge | f0f911c | 2003-11-09 09:51:33 +0000 | [diff] [blame] | 6 | #include <sys/mman.h> |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 7 | |
| 8 | void sig_handler(int sig){ |
| 9 | int var; |
| 10 | fprintf(stderr, "caught signal, local var is on %p\n", &var); |
| 11 | } |
| 12 | |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 13 | int main(int argv, char** argc) { |
| 14 | int res, i; |
| 15 | stack_t sigstk; |
| 16 | struct sigaction act; |
fitzhardinge | 8e53678 | 2003-11-21 09:22:06 +0000 | [diff] [blame] | 17 | static const int size = SIGSTKSZ*2; |
fitzhardinge | f0f911c | 2003-11-09 09:51:33 +0000 | [diff] [blame] | 18 | char *stk = (char *)mmap(0, size, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); |
| 19 | sigstk.ss_sp = stk; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 20 | |
fitzhardinge | f0f911c | 2003-11-09 09:51:33 +0000 | [diff] [blame] | 21 | sigstk.ss_size = size; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 22 | sigstk.ss_flags = 0; |
| 23 | fprintf(stderr, "calling sigaltstack, stack base is %p\n", sigstk.ss_sp); |
| 24 | if (sigaltstack(&sigstk,0)<0) perror("sigaltstack"); |
| 25 | |
| 26 | fprintf(stderr,"setting sigaction\n"); |
| 27 | act.sa_flags=SA_ONSTACK; |
| 28 | act.sa_handler=&sig_handler; |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame^] | 29 | sigemptyset(&act.sa_mask); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 30 | res = sigaction(SIGUSR1,&act,0); |
| 31 | fprintf(stderr, "res = %d\n", res); |
| 32 | fprintf(stderr, "raising the signal\n"); |
| 33 | raise(SIGUSR1); |
| 34 | |
| 35 | /* Loop long enough so valgrind has a forced context switch and |
| 36 | actually delivers the signal before the thread exits. */ |
| 37 | for (i = 0; i < 1000000; i++) ; |
| 38 | |
| 39 | fprintf(stderr, "done\n"); |
| 40 | return 0; |
| 41 | } |