jehanne/qa/lib/newlib/050-setsid.c

54 lines
1.2 KiB
C
Raw Normal View History

2017-09-08 00:15:12 +02:00
#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
int
main(int argc, char **argv)
{
pid_t pid;
int p[2], ppgrp, opgrp, npgrp;
char c = '?';
if (pipe(p) != 0)
perror("pipe() error");
else {
ppgrp = getpgrp();
printf("parent's pid %d; process group id %d\n", getpid(), ppgrp);
if ((pid = fork()) == 0) {
opgrp = getpgrp();
printf("child's pid %d; process group id %d\n", getpid(), opgrp);
write(p[1], &c, 1);
setsid();
npgrp = getpgrp();
if(opgrp == npgrp){
printf("FAIL: setsid did not changed child's process group id\n");
exit(EXIT_FAILURE);
}
printf("child's process group id is now %d\n", npgrp);
sleep(5);
exit(EXIT_SUCCESS);
} else {
read(p[0], &c, 1);
sleep(3);
if(ppgrp != getpgrp()){
printf("FAIL: parent's process group id changed from %d to %d\n", ppgrp, getpgrp());
exit(EXIT_FAILURE);
}
#ifndef WITH_SIGCHLD
npgrp = getsid(pid);
if(npgrp < 0){
printf("FAIL: parent's getsid(%d) failed with errno %d\n", pid, errno);
exit(EXIT_FAILURE);
}
if(npgrp == ppgrp){
printf("FAIL: parent's getsid(%d) returned old process group id that should be changed\n", pid);
exit(EXIT_FAILURE);
}
#endif
}
}
}