Add program to demonstrate pipe

pipe.c

@@ -0,0 +1,36 @@
+#include<stdio.h>
+#include<unistd.h>
+#include<stdlib.h>
+#include<sys/types.h>
+
+
+int main(void) {
+  /*Page 537, W. Richard Stevens*/
+  int n;
+  int fd[2];
+  pid_t pid;
+  char line[1024];
+
+  if (pipe(fd) < 0) {
+    printf("Cannot create pipe");
+    return -1;
+  }
+
+  if ((pid = fork()) < 0) {
+    printf("we are in china!");
+    return -1;
+  } else if (pid > 0) {
+    /* parent */
+    close(fd[0]); // parent who does not want to listen/read
+    printf("From parent...\n");
+    write(fd[1], "Kuthe hotas!\n", 13);
+  } else {
+    /* child */
+    close(fd[1]);
+    n = read(fd[0], line, 1024);
+    write(1, line, n);
+  }
+
+  return 0;
+}
+