72 lines
1.8 KiB
C
72 lines
1.8 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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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 %d\n", getppid(), getpid());
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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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int pid2;
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int pid2temp;
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(void) signal(SIGUSR1, traitement);
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pid = fork();
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pid2temp = pid;
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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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pid2 = fork();
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if(pid2 == -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(pid2 == 0)// Process fils du fils
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{
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printf("fils P3 pid=%d\n", getpid());
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kill(pid2temp, 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 fils
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{
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printf("fils P2 pid=%d\n", getpid());
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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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}
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}
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else // process principal (pere)
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{
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kill(pid2temp, SIGUSR1);
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printf("pere pid=%d\n", getpid());
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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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