Unix system calls 2

Unix System Calls

(exec, exit, wait)

---

// Unix system calls

// exec, exit, wait

#include<stdio.h>

#include<string.h>

#include<sys/types.h>

#include<unistd.h>

int main(int argc, char *argv[])

{

pid_t pid;

int cstatus;

pid_t c;

pid=fork();

if(pid == -1)

printf(“\n Error in creating process “);

else if(pid == 0)

{

printf(“\nExecuting in child process”);

execvp(argv[1], &argv[1]);

perror(“exec failure”);

exit(1);

}

else

{

printf(“\nExecuting in parent process”);

c = wait(&cstatus); /* Wait for child to complete. */

printf(“\nParent: Child %ld exited with status = %d\n”, (long) c, cstatus);

}

}