1// commit: 6871fd773dcedbf056317d5d5e87b4859e97c4a4 2011-03-10
2// commit: 9505bfbc40fec217820abad7142663eda60cd6be 2014-03-18
3// catching stackoverflow SIGSEGV using sigaltstack
4// mips stack_t is inconsistent with other archs
5#define _XOPEN_SOURCE 700
6#include <signal.h>
7#include <stdint.h>
8#include <stdlib.h>
9#include <string.h>
10#include <errno.h>
11#include "test.h"
12
13#define T(f) ((f)==0 || (t_error(#f " failed: %s\n", strerror(errno)),0))
14
15static char stack[SIGSTKSZ];
16
17static void handler(int sig)
18{
19	uintptr_t i;
20	stack_t ss;
21
22	i = (uintptr_t)&i;
23	if (i < (uintptr_t)stack || i >= (uintptr_t)stack+SIGSTKSZ)
24		t_error("signal handler was not invoked on the altstack\n");
25
26	T(sigaltstack(0, &ss));
27	if (ss.ss_flags != SS_ONSTACK)
28		t_error("ss_flags is not SS_ONSTACK in the signal handler\n");
29}
30
31int main(void)
32{
33	stack_t ss;
34	struct sigaction sa;
35
36	ss.ss_sp = stack;
37	ss.ss_size = sizeof stack;
38	ss.ss_flags = 0;
39	sa.sa_handler = handler;
40	sa.sa_flags = SA_ONSTACK;
41
42	T(sigaltstack(&ss, 0));
43	T(sigfillset(&sa.sa_mask));
44	T(sigaction(SIGUSR1, &sa, 0));
45	T(raise(SIGUSR1));
46
47	errno = 0;
48	ss.ss_size = MINSIGSTKSZ-1;
49	if (sigaltstack(&ss, 0) != -1 || errno != ENOMEM)
50		t_error("sigaltstack with stack size < MINSIGSTKSZ should have failed with ENOMEM, "
51			"got %s\n", strerror(errno));
52	errno = 0;
53	ss.ss_flags = -1;
54	ss.ss_size = MINSIGSTKSZ;
55	if (sigaltstack(&ss, 0) != -1 || errno != EINVAL)
56		t_error("sigaltstack with bad ss_flags should have failed with EINVAL, "
57			"got %s\n", strerror(errno));
58	errno = 0;
59	T(sigaltstack(0, 0));
60
61	return t_status;
62}
63