X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=stdout.c;h=87bf711f0d7a3794b7a6539c698a44457e984c28;hp=f857814a93ef8310669ca4138156a31394767a8c;hb=8ec331c7d880185b4931ac46e2c5c34dd36a8f84;hpb=b844e3fbfb8a4fc03c83df84626b57fc8dc30ad2

diff --git a/stdout.c b/stdout.c
index f857814a..87bf711f 100644
--- a/stdout.c
+++ b/stdout.c
@@ -1,3 +1,14 @@
+/*
+ * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file stdout.c Functions that deal with writing to stdout. */
+
+#include <dirent.h> /* readdir() */
+#include <assert.h>
+
 #include "para.h"
 #include "string.h"
 #include "list.h"
@@ -6,15 +17,24 @@
 #include "error.h"
 #include "stdout.h"
 
-void stdout_pre_select(struct sched *s, struct task *t)
+/**
+ * The pre_select function of the stdout task.
+ *
+ * \param s The scheduler this task was registered to.
+ * \param t The task structure of the stdout task.
+ *
+ * This function is always successful. If there is data available in the input
+ * buffer, it adds \p STDOUT_FILENO to the write fd set of \a s.
+ */
+static void stdout_pre_select(struct sched *s, struct task *t)
 {
-	struct stdout_task *sot = t->private_data;
+	struct stdout_task *sot = container_of(t, struct stdout_task, task);
 
-	t->ret = 1;
+	t->error = 0;
 	sot->check_fd = 0;
 	if (!*sot->loaded) {
-		if (*sot->input_eof) {
-			t->ret = -E_STDOUT_EOF;
+		if (*sot->input_error < 0) {
+			t->error = *sot->input_error;
 			s->timeout.tv_sec = 0;
 			s->timeout.tv_usec = 1;
 		}
@@ -24,40 +44,58 @@ void stdout_pre_select(struct sched *s, struct task *t)
 	para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
 }
 
-void stdout_post_select(struct sched *s, struct task *t)
+/**
+ * The post select function of the stdout task.
+ *
+ * \param s The scheduler this task was registered to.
+ * \param t The task structure of the stdout task.
+ *
+ * This function checks if \p STDOUT_FILENO was included by in the write fd set
+ * of \a s during the previous pre_select call.  If yes, and \p STDOUT_FILENO
+ * appeears to be writable, the data loaded in the input buffer is written to
+ * stdout.
+ */
+static void stdout_post_select(struct sched *s, struct task *t)
 {
-	struct stdout_task *sot = t->private_data;
+	struct stdout_task *sot = container_of(t, struct stdout_task, task);
 	ssize_t ret;
 
-	t->ret = 1;
+	t->error = 0;
 	if (!sot->check_fd) {
-		if (*sot->input_eof)
-			t->ret = -E_STDOUT_EOF;
+		if (!*sot->loaded && *sot->input_error < 0)
+			t->error = *sot->input_error;
 		return;
 	}
 	if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
 		return;
-	t->ret = -E_STDOUT_WRITE;
 	ret = write(STDOUT_FILENO, sot->buf, *sot->loaded);
-	if (ret <= 0)
+	if (ret < 0) {
+		t->error = -ERRNO_TO_PARA_ERROR(errno);
 		return;
+	}
 	*sot->loaded -= ret;
-	t->ret = 1;
-}
-
-void stdout_default_event_handler(struct task *t)
-{
-	PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
-	unregister_task(t);
+	if (*sot->loaded)
+		memmove(sot->buf, sot->buf + ret, *sot->loaded);
 }
 
-
+/**
+ * Initialize a stdout task structure with default values.
+ *
+ * \param sot The stdout task structure.
+ *
+ * This fills in the pre/post select function poinzters of the task structure
+ * given by \a sot.
+ */
 void stdout_set_defaults(struct stdout_task *sot)
 {
-	sot->task.private_data = sot;
+	int ret;
+
 	sot->task.pre_select = stdout_pre_select;
 	sot->task.post_select = stdout_post_select;
-	sot->task.event_handler = stdout_default_event_handler;
-	sot->eof = 0;
 	sprintf(sot->task.status, "stdout writer");
+	ret = mark_fd_nonblocking(STDOUT_FILENO);
+	if (ret >= 0)
+		return;
+	PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+	exit(EXIT_FAILURE);
 }