Import glibc-mainline for 2006-08-16

git-svn-id: svn://svn.eglibc.org/fsf/trunk@4 7b3dc134-2b1b-0410-93df-9e9f96275f8d

1 files changed, 70 insertions, 0 deletions

diff --git a/libc/manual/examples/pipe.c b/libc/manual/examples/pipe.c
new file mode 100644
index 000000000..92d339a7b
--- /dev/null
+++ b/libc/manual/examples/pipe.c
@@ -0,0 +1,70 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Read characters from the pipe and echo them to @code{stdout}.  */
+
+void
+read_from_pipe (int file)
+{
+  FILE *stream;
+  int c;
+  stream = fdopen (file, "r");
+  while ((c = fgetc (stream)) != EOF)
+    putchar (c);
+  fclose (stream);
+}
+
+/* Write some random text to the pipe. */
+
+void
+write_to_pipe (int file)
+{
+  FILE *stream;
+  stream = fdopen (file, "w");
+  fprintf (stream, "hello, world!\n");
+  fprintf (stream, "goodbye, world!\n");
+  fclose (stream);
+}
+
+int
+main (void)
+{
+  pid_t pid;
+  int mypipe[2];
+
+/*@group*/
+  /* Create the pipe.  */
+  if (pipe (mypipe))
+    {
+      fprintf (stderr, "Pipe failed.\n");
+      return EXIT_FAILURE;
+    }
+/*@end group*/
+
+  /* Create the child process.  */
+  pid = fork ();
+  if (pid == (pid_t) 0)
+    {
+      /* This is the child process.
+	 Close other end first.  */
+      close (mypipe[1]);
+      read_from_pipe (mypipe[0]);
+      return EXIT_SUCCESS;
+    }
+  else if (pid < (pid_t) 0)
+    {
+      /* The fork failed.  */
+      fprintf (stderr, "Fork failed.\n");
+      return EXIT_FAILURE;
+    }
+  else
+    {
+      /* This is the parent process.
+	 Close other end first.  */
+      close (mypipe[0]);
+      write_to_pipe (mypipe[1]);
+      return EXIT_SUCCESS;
+    }
+}