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Lab4.c: Guarantees the child process will print its message before the parent process. #include #include /* contains prototype for wait */ #include #include int main(void) { int pid; int status; printf("Hello World! "); pid = fork( ); if (pid == -1) /* check for error in fork */ { perror("bad fork"); exit(1); } if (pid == 0) printf("I am the child process. "); else { wait(&status); /* parent waits for child to finish */ printf("I am the parent process. "); } }

Lab5.c: #include #include #include #include int main() { int forkresult; int status; printf("%d: I am the parent. Remember my number! ", getpid()); printf("%d: I am now going to fork ... ", getpid()); forkresult = fork(); if (forkresult != 0) { /* the parent will execute this code */ wait(&status); printf("%d: My child's pid is %d ", getpid(), forkresult); } else /* forkresult == 0 */ { /* the child will execute this code */ printf("%d: Hi! I am the child. ", getpid()); } printf("%d: like father like son. ", getpid());