Enrico Fraccaroli (Galfurian)
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/// @file t_kill.c
|
|
/// @brief
|
|
/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
|
|
/// See LICENSE.md for details.
|
|
|
|
#include <sys/unistd.h>
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <strerror.h>
|
|
#include <sys/wait.h>
|
|
|
|
#define cpu_relax() asm volatile("pause\n" \
|
|
: \
|
|
: \
|
|
: "memory")
|
|
|
|
static inline void fake_sleep(int times)
|
|
{
|
|
for (int j = 0; j < times; ++j)
|
|
for (long i = 1; i < 1024000; ++i)
|
|
cpu_relax();
|
|
}
|
|
|
|
void child_sigusr1_handler(int sig)
|
|
{
|
|
printf("handler(sig: %d) : Starting handler (pid: %d).\n", sig, getpid());
|
|
printf("handler(sig: %d) : Ending handler (pid: %d).\n", sig, getpid());
|
|
}
|
|
|
|
void child_process()
|
|
{
|
|
while (1) {
|
|
printf("I'm the child (%d): I'm playing around!\n", getpid());
|
|
fake_sleep(1);
|
|
}
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
printf("main : Creating child!\n");
|
|
pid_t ppid;
|
|
if ((ppid = fork()) == 0) {
|
|
printf("I'm the child (%d)!\n", ppid);
|
|
sigaction_t action;
|
|
memset(&action, 0, sizeof(action));
|
|
action.sa_handler = child_sigusr1_handler;
|
|
if (sigaction(SIGUSR1, &action, NULL) == -1) {
|
|
printf("Failed to set signal handler (%s).\n", SIGUSR1, strerror(errno));
|
|
return 1;
|
|
}
|
|
child_process();
|
|
} else {
|
|
printf("I'm the parent (%d)!\n", ppid);
|
|
}
|
|
fake_sleep(9);
|
|
kill(ppid, SIGUSR1);
|
|
fake_sleep(9);
|
|
kill(ppid, SIGTERM);
|
|
int status;
|
|
wait(&status);
|
|
printf("main : end (%d)\n", status);
|
|
return 0;
|
|
} |