X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=stdout.c;h=6539b68f3ff8f91befc8d99cf6b5c3002b2b9e98;hp=af59807047a4d1e0d1d792632b1b5e1e80b6fd25;hb=5587494468627e20fe622b6055689717262d09ab;hpb=40cbbb95e256e63e1e6958e9034311d4904604af

diff --git a/stdout.c b/stdout.c
index af598070..6539b68f 100644
--- a/stdout.c
+++ b/stdout.c
@@ -1,57 +1,158 @@
+/*
+ * Copyright (C) 2006-2009 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 <stdbool.h>
+
 #include "para.h"
-#include "string.h"
 #include "list.h"
 #include "sched.h"
 #include "fd.h"
 #include "error.h"
 #include "stdout.h"
+#include "buffer_tree.h"
+
+/**
+ * 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 = container_of(t, struct stdout_task, task);
+
+	t->error = 0;
+	sot->check_fd = 0;
+	if (!*sot->loaded) {
+		if (*sot->input_error < 0) {
+			t->error = *sot->input_error;
+			s->timeout.tv_sec = 0;
+			s->timeout.tv_usec = 1;
+		}
+		return;
+	}
+	sot->check_fd = 1;
+	para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
+}
 
-void stdout_pre_select(struct sched *s, struct task *t)
+static void stdout_pre_select_btr(struct sched *s, struct task *t)
 {
-	struct stdout_task *sot = t->private_data;
+	struct stdout_task *sot = container_of(t, struct stdout_task, task);
+	size_t sz = btr_get_input_queue_size(sot->btrn);
 
-	t->ret = 1;
+	t->error = 0;
 	sot->check_fd = 0;
-	if (!*sot->loaded)
+	if (sz == 0) {
+		if (btr_no_parent(sot->btrn)) {
+			t->error = -E_ORPHAN;
+			btr_del_node(sot->btrn);
+			s->timeout.tv_sec = 0;
+			s->timeout.tv_usec = 1;
+		}
 		return;
+	}
 	sot->check_fd = 1;
 	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->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)
+	ret = write(STDOUT_FILENO, *sot->bufp, *sot->loaded);
+	if (ret < 0) {
+		t->error = -ERRNO_TO_PARA_ERROR(errno);
 		return;
+	}
 	*sot->loaded -= ret;
-	t->ret = 1;
+	if (*sot->loaded)
+		memmove(*sot->bufp, *sot->bufp + ret, *sot->loaded);
 }
 
-void stdout_default_event_handler(struct task *t)
+static void stdout_post_select_btr(struct sched *s, struct task *t)
 {
-	PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
-	unregister_task(t);
-}
-
+	struct stdout_task *sot = container_of(t, struct stdout_task, task);
+	ssize_t ret;
+	size_t sz = btr_get_input_queue_size(sot->btrn);
+	bool orphan = btr_no_parent(sot->btrn);
+	char *buf;
 
+	t->error = 0;
+	if (!sot->check_fd) {
+		if (sz == 0 && orphan) {
+			t->error = -E_ORPHAN;
+			goto err;
+		}
+		return;
+	}
+	if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
+		return;
+	sz = btr_next_buffer(sot->btrn, &buf);
+	if (sz == 0)
+		return;
+	ret = write(STDOUT_FILENO, buf, sz);
+	if (ret < 0) {
+		t->error = -ERRNO_TO_PARA_ERROR(errno);
+		goto err;
+	}
+	btr_consume(sot->btrn, ret);
+	return;
+err:
+	btr_del_node(sot->btrn);
+}
+/**
+ * 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;
-	sot->task.pre_select = stdout_pre_select;
-	sot->task.post_select = stdout_post_select;
-	sot->task.event_handler = stdout_default_event_handler;
-	sot->task.flags = 0;
+	int ret;
+
+	if (sot->btrn) {
+		sot->task.pre_select = stdout_pre_select_btr;
+		sot->task.post_select = stdout_post_select_btr;
+	} else {
+		sot->task.pre_select = stdout_pre_select;
+		sot->task.post_select = stdout_post_select;
+	}
 	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);
 }