here is the code. please go through it and reply with comments.

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

void cvs_process_open (void)
{
     int      my_read[2];
     int      my_write[2];
     int      cvs_process_my_read;
     int      cvs_process_my_write;
     int      cvs_process_his_read;
     int      cvs_process_his_write;
     int      data_processed;
     char     **args = NULL;
     char     buffer[11];
     pid_t    pID;

     args = (char **)malloc(sizeof(char *) * 6);
     if(NULL == args) {
         printf("unable to allocate mem\n");
         exit(1);
     }/* if(NULL == args) */

     args[0] = (char *)strdup("cvs");
     args[1] = (char *)strdup("-d");
     args[2] = (char 
*)strdup(":pserver:mehul@192.168.0.35:/home/cvs/repository");
     args[3] = (char *)strdup("-q");
     args[4] = (char *)strdup("login");
     args[5] = (char *)NULL;

     /* Open two pipes. (Bidirectional communication). */
     if ((pipe (my_read) == -1) || (pipe (my_write) == -1)) {
         fprintf(stderr, "unable to open pipe\n");
         exit(1);
     }/* if ((pipe (my_read) == -1) || (pipe (my_write) == -1)) 
*/

     cvs_process_my_read = my_read[0];
     cvs_process_my_write = my_write[1];
     cvs_process_his_read = my_write[0];
     cvs_process_his_write = my_read[1];

     /* Fork another process. We'll remember the process id
      *  so that we can later use it to kill the filter if
      *  necessary.
      */
     pID= fork ();

     if (pID == 0) {
         /* close(cvs_process_my_read);
         close(cvs_process_my_write); */
         /* Execute the filter. The "_exit" call should never
          *  be reached, unless some strange error condition
          *  exists.
          */
         data_processed = read(my_write[0], buffer, 10);
         printf("(child) data_processed = %d buffer = %s err = 
%s\n", data_processed, buffer, strerror(errno));
         execvp (args[0], args);
         _exit (1);
     }/* if (pID == 0) */
     else if (pID == -1) {
         // fork failed
         exit(1);
     }/* else for else if (pID == -1) */

     data_processed = write(my_write[1], "*mrc-mrc_*", 
strlen("*mrc-mrc_*"));
     printf("data_processed = %d err = %s\n", data_processed, 
strerror(errno));

     close(cvs_process_his_read);  cvs_process_his_read  = -1;
     close(cvs_process_his_write); cvs_process_his_write = -1;
}/* cvs_process_open() */

int main(int argc, char *argv[])
{
     cvs_process_open();

     return 0;
}/* main() */