#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
int main(void)
{
if(fork()==0) // P2
{
printf("2 PID: %d, PPID: %d\n", getpid
(), getppid
());
if(fork()==0) // P3
{
printf("3 PID: %d, PPID: %d\n", getpid
(), getppid
());
if(fork()==0) // P4
{
printf("4 PID: %d, PPID: %d\n", getpid
(), getppid
());
sleep(120);
return 0;
}
sleep(120);
return 0;
}
sleep(120);
return 0;
}
if(fork()==0) // P2
{
printf("2 PID: %d, PPID: %d\n", getpid
(), getppid
());
if(fork()==0) // P3
{
printf("3 PID: %d, PPID: %d\n", getpid
(), getppid
());
sleep(120);
return 0;
}
if(fork()==0) // P3
{
printf("3 PID: %d, PPID: %d\n", getpid
(), getppid
());
sleep(120);
return 0;
}
sleep(120);
return 0;
}
if(fork()==0) // P1
{
printf("3 PID: %d, PPID: %d\n", getpid
(), getppid
());
if(fork()==0) // P4
{
printf("4 PID: %d, PPID: %d\n", getpid
(), getppid
());
sleep(120);
return 0;
}
if(fork()==0) // P4
{
printf("4 PID: %d, PPID: %d\n", getpid
(), getppid
());
if(fork()==0)
{
printf("4 PID: %d, PPID: %d\n", getpid
(), getppid
());
execlp("pstree", "pstree","-c",(char *)NULL);
sleep(120);
return 0;
}
sleep(120);
return 0;
}
if(fork()==0) // P4
{
printf("4 PID: %d, PPID: %d\n", getpid
(), getppid
());
sleep(120);
return 0;
}
sleep(120);
return 0;
}
sleep(120);
return 0;
}
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