jehanne/qa/lib/newlib/200-signals.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
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int child, cstatus;
void sighup() {
signal(SIGHUP,sighup); /* reset signal */
printf("CHILD: I have received a SIGHUP\n");
}
void sigint() {
signal(SIGINT,sigint); /* reset signal */
printf("CHILD: I have received a SIGINT\n");
}
void sigquit() {
printf("My DADDY has Killed me!!!\n");
exit(0);
}
void sigchld() {
printf("PARENT: got SIGCHLD\n");
#ifdef WITH_SIGCHLD
child = wait(&cstatus);
if(cstatus == 0)
exit(0);
else
{
printf("PARENT: child exited with status %d\n", cstatus);
exit(1);
}
#endif
}
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int
main() {
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int pid, p[2];
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char dummy[1];
/* get child process */
if(pipe(p)){
perror("pipe");
exit(1);
}
if ((pid = fork()) < 0) {
perror("fork");
exit(2);
}
if (pid == 0) {
printf("\nI am the new child!\n\n");
signal(SIGHUP,sighup); /* set function calls */
signal(SIGINT,sigint);
signal(SIGQUIT, sigquit);
printf("\nChild going to loop...\n\n");
write(p[1], "", 1);
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close(p[1]);
close(p[0]);
for(;;); /* loop for ever */
}
else /* parent */
{
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signal(SIGCHLD,sigchld);
if(read(p[0], &dummy, 1) != 1){
printf("sync read");
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exit(EXIT_FAILURE);
}
close(p[1]);
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close(p[0]);
printf("\nPARENT: sending SIGHUP\n\n");
kill(pid,SIGHUP);
sleep(3); /* pause for 3 secs */
printf("\nPARENT: sending SIGINT\n\n");
kill(pid,SIGINT);
sleep(3); /* pause for 3 secs */
printf("\nPARENT: sending SIGQUIT\n\n");
kill(pid,SIGQUIT);
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#ifdef WITH_SIGCHLD
sleep(10000);
exit(1);
#else
child = wait(&cstatus);
if(child == pid && cstatus == 0)
exit(0);
else
{
printf("PARENT: child exited with status %d\n", cstatus);
exit(1);
}
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#endif
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}
}