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#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
static const struct timespec bip = { 0, 1000000000 / 5 };
static void handler(int sig)
{
}
/* Kill our child, but use a separate kill command. This is so that
it's running independently of Valgrind, and so is async with
respect to thread scheduling. */
static void do_kill(int pid, int sig)
{
int status;
int killer;
int ret;
killer = vfork();
if (killer == -1) {
perror("killer/vfork");
exit(1);
}
if (killer == 0) {
char sigbuf[20];
char pidbuf[20];
sprintf(sigbuf, "-%d", sig);
sprintf(pidbuf, "%d", pid);
execl("/bin/kill", "kill", sigbuf, pidbuf, NULL);
perror("exec failed");
exit(1);
}
do
ret = waitpid(killer, &status, 0);
while(ret == -1 && errno == EINTR);
if (ret != killer) {
perror("kill/waitpid");
exit(1);
}
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
printf("kill %d failed status=%s %d\n", killer,
WIFEXITED(status) ? "exit" : "signal",
WIFEXITED(status) ? WEXITSTATUS(status) : WTERMSIG(status));
exit(1);
}
}
static void test(int block, int caughtsig, int fatalsig)
{
int pid;
int status;
int i;
printf("testing: blocking=%d caught=%d fatal=%d... ", block, caughtsig, fatalsig);
fflush(stdout);
pid = fork();
if (pid == -1) {
perror("fork");
exit(1);
}
if (pid == 0) {
alarm(10); /* if something breaks, don't spin forever */
signal(caughtsig, handler);
for(;;)
if (block)
pause();
}
nanosleep(&bip, 0); /* wait for child to get going */
for(i = 0; i < 5; i++) {
do_kill(pid, caughtsig); /* should be caught */
nanosleep(&bip, 0);
do_kill(pid, caughtsig);
do_kill(pid, caughtsig);
}
nanosleep(&bip, 0);
do_kill(pid, fatalsig); /* should kill it */
if (waitpid(pid, &status, 0) != pid)
printf("FAILED: waitpid failed: %s\n", strerror(errno));
else if (!WIFSIGNALED(status) || WTERMSIG(status) != fatalsig)
printf("FAILED: child exited with unexpected status %s %d\n",
WIFEXITED(status) ? "exit" : "signal",
WIFEXITED(status) ? WEXITSTATUS(status) : WTERMSIG(status));
else
printf("PASSED\n");
}
int main()
{
static const int catch[] = { SIGSEGV, SIGUSR1 };
static const int fatal[] = { SIGBUS, SIGUSR2 };
int block, catchidx, fatalidx;
setvbuf(stdout, NULL, _IOLBF, 0);
for(block = 0; block < 2; block++)
for(catchidx = 0; catchidx < sizeof(catch)/sizeof(*catch); catchidx++)
for(fatalidx = 0; fatalidx < sizeof(fatal)/sizeof(*fatal); fatalidx++)
test(block, catch[catchidx], fatal[fatalidx]);
return 0;
}
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