Program To Allow Users To Fork 2 Processes And Then Exit When They Complete In C Language Assignment Solution

Instructions

Objective

Write a program that allows users to fork 2 processes and then exit when they complete in C language.

Requirements and Specifications

Process Activity – Programming Language: C

• Create a program (forkchildren.c) that will fork off two children.
• One child will run the “ls -l” command
• The other will run “cat forkchildren.c”
• The main program will wait for the children to finish and then print a note saying it is finished and then it will end.
• No pipe is needed for this assignment, each child is separate.

Screenshots of output

Source Code

#include #include #include #include int main() { pid_t pid1, pid2; int status; pid1 = fork(); /* fork parent */ if (pid1 == -1) /* if error */ { printf("Error forking first child\n"); return (EXIT_FAILURE); } else if (pid1 == 0) /* if in the first child */ { /* execute "ls -l" */ if (execlp("ls", "ls", "-l", (char *) NULL) < 0) { printf("Error in first child\n"); exit(EXIT_FAILURE); } } pid2 = fork(); /* fork parent again */ if (pid2 == -1) /* if error */ { printf("Error forking second child\n"); return (EXIT_FAILURE); } else if (pid2 == 0) /* if in the second child */ { /* execute "cat forkchildren.c" */ if (execlp("cat", "cat", "forkchildren.c", (char *) NULL) < 0) { printf("Error in second child\n"); exit(EXIT_FAILURE); } } /* wait for all children to end */ while (wait(&status) > 0); printf("Main program completed...\n"); return (EXIT_SUCCESS); }