Ian Cameron Processes

[codypeak]

No description provided.

[codejoncode]

You have some good looking stuff here. I would only recommend the following if statement,

if (rc < 0) {
        fprintf(stderr, "fork failed\n");
        exit(1);
    }

/*stderr is the standard error stream the default destination for error messages and other diagnostic warnings. Like stdout 
      it is usually also directed by default to the text console(generally, on the screen). 
      */
exit   so its prototype looks like this 
      void exit(int status);
      Returns nothing   but indicates whehter the program terminated normally.  
      exit_success   successful termination 
      0    successful termination 
      exit_failure   unsuccessful termination 

      exit will terminate the program and everything that comes after it will not show up. 

[codejoncode]

Great job here Ian really clean and gets the job done.

[codejoncode]

For ex4 we want to set up the main to accept argc and argv[] this would be entered in on the command line and read into the program and then worked with accordingly

int main(int argc, char* argv[])
{
    printf("Parent process here\n");
    int rc = fork();

    if (rc < 0) {
        fprintf(stderr, "fork failed\n");
        exit(1);
    } else if (rc == 0) {
        printf("Child process here\n");

        // execl("/bin/ls", "ls", "-l" (char *) NULL);
        
        // char *args[] = {"ls", "-l", NULL};
        // execv("/bin/ls", args);

        //execlp("ls", "ls", "-l", (char *) NULL);

        char *args[] = {"ls", "-l", NULL};
        execvp("ls", args);
    } else {
        int wc = waitpid(rc, NULL, 0);
    }

    return 0;
}

This way we would then pass "/bin/ls"

[codejoncode]

The biggest difference is we could replace char *args[] = {"ls", "-l", NULL}; with your char * argv[] main argument

[codejoncode]

Ian for pipe(p) I would check if it is less than 0 else I would proceed. If it is less than zero then you want to fprintf(stdeer, "pipe failed\n); exit(1); else you can now move forward with your forking remember to error check the fork call as well.