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-rw-r--r--manual/examples/pipe.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/manual/examples/pipe.c b/manual/examples/pipe.c
index 054550f..92d339a 100644
--- a/manual/examples/pipe.c
+++ b/manual/examples/pipe.c
@@ -5,7 +5,7 @@
/* Read characters from the pipe and echo them to @code{stdout}. */
-void
+void
read_from_pipe (int file)
{
FILE *stream;
@@ -18,7 +18,7 @@ read_from_pipe (int file)
/* Write some random text to the pipe. */
-void
+void
write_to_pipe (int file)
{
FILE *stream;
@@ -35,7 +35,7 @@ main (void)
int mypipe[2];
/*@group*/
- /* Create the pipe. */
+ /* Create the pipe. */
if (pipe (mypipe))
{
fprintf (stderr, "Pipe failed.\n");
@@ -43,23 +43,27 @@ main (void)
}
/*@end group*/
- /* Create the child process. */
+ /* Create the child process. */
pid = fork ();
if (pid == (pid_t) 0)
{
- /* This is the child process. */
+ /* 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. */
+ /* The fork failed. */
fprintf (stderr, "Fork failed.\n");
return EXIT_FAILURE;
}
else
{
- /* This is the parent process. */
+ /* This is the parent process.
+ Close other end first. */
+ close (mypipe[0]);
write_to_pipe (mypipe[1]);
return EXIT_SUCCESS;
}