Enrico Fraccaroli
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/// @file t_kill.c
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/// @brief
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/// @copyright (c) 2014-2023 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <sys/unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strerror.h>
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#include <sys/wait.h>
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#define cpu_relax() __asm__ __volatile__("pause\n" \
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: \
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: \
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: "memory")
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static inline void fake_sleep(int times)
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{
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for (int j = 0; j < times; ++j)
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for (long i = 1; i < 1024000; ++i)
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cpu_relax();
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}
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void child_sigusr1_handler(int sig)
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{
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printf("handler(sig: %d) : Starting handler (pid: %d).\n", sig, getpid());
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printf("handler(sig: %d) : Ending handler (pid: %d).\n", sig, getpid());
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}
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void child_process(void)
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{
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while (1) {
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printf("I'm the child (%d): I'm playing around!\n", getpid());
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fake_sleep(1);
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}
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}
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int main(int argc, char *argv[])
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{
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printf("main : Creating child!\n");
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pid_t ppid;
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if ((ppid = fork()) == 0) {
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printf("I'm the child (%d)!\n", ppid);
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sigaction_t action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = child_sigusr1_handler;
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if (sigaction(SIGUSR1, &action, NULL) == -1) {
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printf("Failed to set signal handler (%s).\n", SIGUSR1, strerror(errno));
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return EXIT_FAILURE;
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}
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child_process();
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} else {
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printf("I'm the parent (%d)!\n", ppid);
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}
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fake_sleep(9);
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kill(ppid, SIGUSR1);
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fake_sleep(9);
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kill(ppid, SIGTERM);
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int status;
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wait(&status);
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printf("main : end (%d)\n", status);
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return EXIT_SUCCESS;
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}
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