I'm playing with waitpid() and signal() and I'm looking for reliable test cases for returning WIFSIGNALED(status) = WIFSTOPPED(status) = WIFCONTINUED (status) = true but can't find any...
Care to tell me how can I make sure those return true so I can debug my code?
Also, a few hints about what signals should I catch with signal() to test those macros would be helpful...
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
#define NELEMS(x) (sizeof (x) / sizeof (x)[0])
static void testsignaled(void) {
kill(getpid(), SIGINT);
}
static void teststopped(void) {
kill(getpid(), SIGSTOP);
}
static void testcontinued(void) {
kill(getpid(), SIGSTOP);
/* Busy-work to keep us from exiting before the parent waits.
* This is a race.
*/
alarm(1);
while(1) {}
}
int main(void) {
void (*test[])(void) = {testsignaled, teststopped, testcontinued};
pid_t pid[NELEMS(test)];
int i, status;
for(i = 0; i < sizeof test / sizeof test[0]; ++i) {
pid[i] = fork();
if(0 == pid[i]) {
test[i]();
return 0;
}
}
/* Pause to let the child processes to do their thing.
* This is a race.
*/
sleep(1);
/* Observe the stoppage of the third process and continue it. */
wait4(pid[2], &status, WUNTRACED, 0);
kill(pid[2], SIGCONT);
/* Wait for the child processes. */
for(i = 0; i < NELEMS(test); ++i) {
wait4(pid[i], &status, WCONTINUED | WUNTRACED, 0);
printf("%d%s%s%s\n", i, WIFCONTINUED(status) ? " CONTINUED" : "", WIFSIGNALED(status) ? " SIGNALED" : "", WIFSTOPPED(status) ? " STOPPED" : "");
}
return 0;
}