(In Unix) Make a C program that creates a zombie child process. Both parent and child processes should execute the command "ps" to show the current process list.
(1) ** Copy and paste your code in your report. ** (2) Take a screen shot that shows the defunct information generated by "ps".
Hi Student,
A child process sends a exit stutus to the parent once its task is done. Now in scenarios when the parent process doesn't acknowledges the message, the child function remains in a “zombie” state, meaning it has executed but not exited.
Note : system() call is used to run any system command.
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int main()
{
// using fork to create child
pid_t child_pid = fork();
// Parent process
if (child_pid > 0){
system("ps");
sleep(50); // parent is sleeping
}
// Child process
else {
system("ps");
exit(0); // child is done
}
return 0;
}
Output :
PID TTY TIME CMD 26183 ? 00:00:00 58cb8c854bf9221 26184 ? 00:00:00 58cb8c854bf9221 26185 ? 00:00:00 sh 26186 ? 00:00:00 sh 26187 ? 00:00:00 ps 26188 ? 00:00:00 ps PID TTY TIME CMD 26183 ? 00:00:00 58cb8c854bf9221 26184 ? 00:00:00 58cb8c854bf9221 26185 ? 00:00:00 sh 26186 ? 00:00:00 sh 26187 ? 00:00:00 ps 26188 ? 00:00:00 ps
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