GTU OS Program - 15 Process creation

15. Write a program for process creation using C. (Use of gcc compiler)

Start by creating a new file called process.c using vim

Complete code of the program

  1. #include <stddef.h>
  2. #include <stdlib.h>
  3. #include <unistd.h>
  4. #include <sys/types.h>
  5. #include <sys/wait.h>
  6.  
  7. /* Execute the command using this shell program.  */
  8. #define SHELL "/bin/sh"
  9.  
  10. int
  11. my_system (const char *command)
  12. {
  13.         int status;
  14.         pid_t pid;
  15.  
  16.         pid = fork ();
  17.         if (pid == 0)
  18.         {
  19.                 /* This is the child process.  Execute the shell command. */
  20.                 execl (SHELL, SHELL, "-c", command, NULL);
  21.                 _exit (EXIT_FAILURE):
  22.         }
  23.         else if (pid < 0 )
  24.                 //the fork failed. Report failure
  25.                 status = -1;
  26.         else
  27.                 // this is the parent process. It waits for the child process to complete
  28.                 if (waitpid (pid, &status, 0) != pid)
  29.                         status = -1;
  30.         return status;
  31. }

compiling the process.c file using gcc and executing it in terminal

  1. tkanu025@hp:~/lab_solutions$ gcc process.c
Output
unfortunately I am facing a problem in installing gcc in my ubuntu. I will upload the output image as soon as that problem is resolved.


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