temp

gistfile1.c

/*
 * Test fork(), pipe(), etc.
 * Author: xcv58
 * Date: 2/2/2014
 */

#ifndef _STDIO_H_
#define _STDIO_H_
#include <stdio.h>
#endif

#ifndef PIPE
#define PIPE 1
#endif

/* #include <stdio.h> */
/* void read() */
/* { */
/*   printf("This is read.\n"); */
/*   close(filedes[0]); */
/*   return; */
/* } */
/* void write() */
/* { */
/*   printf("This is write.\n"); */
/*   close(filedes[1]); */
/*   return; */
/* } */
int getLine(char* str)
{
  int i = 0;
  while ((str[i++] = getchar()) != '\n');
  str[i] = '\0';
  return 0;
}

int main()
{
  printf("\n");

#ifdef PIPE
  printf("%s\n",__FILE__);
  char str[24];
  int filedes[2];
  int returnCodePipe = pipe(filedes);
  if (!returnCodePipe) {
    printf("Successfully create pipe.\n");
  }
  char readbuffer[80];
  int nbytes;
#endif

  int myPid = getpid();
  int returnCodeFork = fork();
  printf("My pid is %d\n", getpid());
  if (returnCodeFork == 0) {
    printf("I am child.\nMy parent pid is: %d\n", myPid);

#ifdef PIPE
    if (!returnCodePipe) {
      /* read(); */
      /* close(filedes[1]); */
      nbytes = read(filedes[0], readbuffer, sizeof(readbuffer));
      printf("Received str: %s", readbuffer);
    }
#endif

    printf("\n");
  } else {
    printf("I am parent.\nMy child's pid is: %d\n", returnCodeFork);

#ifdef PIPE
    if (!returnCodePipe) {
    /* write(); */
    /* cloese(filedes[0]); */
    /* str[0] = getchar(); */
    /* str[1] = '\0'; */
    getLine(str);
    printf("str length: %d\n", strlen(str));
    write(filedes[1], str, (strlen(str)+1));
  }
#endif

    printf("\n");
  }
    return 0;
  }