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Resources » Articles/Knowledge Sharing » General »
Usage of fork, sleep, exec, wait system calls program in c
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#include
int execl(char *path , char *arg0,...);
main()
{
int a;
system("clear");
a = fork();
printf("\n \n Execution after fork()");
if(a==0)
{
printf("\nIm child process with PID %d" , getpid());
printf("\nHere ,value of a =%d",a);
printf("\nGoing to execute sample calling 'sh'");
system("sh sample");
printf("\n The image of process is retained \n\n\n");
wait();
}
else
{
sleep(4);
printf("\n Im parent process with PID %d",getppid());
printf("\n Here , value of a = %d(childs PID)",a);
printf("\nGoing to execute sample using exec ie by replacing the image of process with the sample programs image \n");
execl("/bin/sh","sh","sample",(char *)0);
printf("\n The Statement will not be executed image replaced");
wait();
}
}
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