51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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// fonction de traitement du signal SIGUSR1
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void traitement(int sig)
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{
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(void) signal(SIGUSR1, traitement);
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printf("un signal SIGUSR1 ppid :%d\n", getppid());
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}
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int main(int argc, char *argv[])
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{
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int pid;
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(void) signal(SIGUSR1, traitement); // rederoutage des signaux SIGUSR1
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// vers la fonction traitement
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pid = fork();
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if (pid == -1)
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{
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printf("pb creation fork : %s\n", strerror(errno));
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exit(1);
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}
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else
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{
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if (pid == 0) // process fils
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{
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printf("fils pid=%d\n", getpid());
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kill(getppid(), SIGUSR1);
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sleep(2); // tempo pour être certain que le fils sera
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//encore vivant quand le pere lui
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//enverra son signal
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}
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else // process principal (pere)
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{
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printf("pere pid=%d\n", getpid());
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kill(pid, SIGUSR1);
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sleep(2); // tempo pour être certain que le pere sera
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//encore vivant quand le fils lui
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//enverra son signal
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}
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}
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return EXIT_SUCCESS;
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}
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