Lab 1, problem 3 completed

Labs/Lab1/catcount.c

+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+extern char **environ;
+int main(int argc, char* argv[]) {
+  print_environment();
+  char *str = argv[1];
+  int pid1, pid2;
+  int *status;
+  pid1 = Fork();
+  if (pid1 == 0) {
+     execlp("/bin/cat", "/bin/cat", str, (char *)NULL);
+     exit(0);
+  }
+  else {
+    // parent process
+    wait(status);//
+    pid2 = Fork();
+    if (pid2 == 0){
+       execlp("/usr/bin/wc", "/usr/bin/wc", str, (char *)NULL);
+       exit(0);
+    }
+    else{
+      wait(&status); //the wait for child2
+    }
+    exit(0);
+  }
+  return 0;
+}
+void print_environment(void){
+   char **p;
+   for (p = environ; *p != NULL; p++){
+      char *element = *p;
+      printf("%s\n", element);
+   }
+   return 0;
+}
+
+pid_t Fork(void){
+  int pid = fork();
+  if (-1 == pid){
+     perror("fork() Failure\n");
+     exit(-1);
+  }
+}
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