+/*
+ * Copyright (C) 2006-2011 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"
-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 input data available, 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);
+ int ret;
- t->ret = 1;
- sot->check_fd = 0;
- if (!*sot->loaded)
- return;
- sot->check_fd = 1;
- para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
+ t->error = 0;
+ ret = btr_node_status(sot->btrn, 0, BTR_NT_LEAF);
+ if (ret > 0)
+ para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
+ else if (ret < 0)
+ sched_min_delay(s);
}
-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 writes input data from the buffer tree to stdout if \p
+ * STDOUT_FILENO is writable.
+ */
+static void stdout_post_select(struct sched *s, struct task *t)
{
- struct stdout_task *sot = t->private_data;
- ssize_t ret;
+ struct stdout_task *sot = container_of(t, struct stdout_task, task);
+ struct btr_node *btrn = sot->btrn;
+ int ret;
+ char *buf;
+ size_t sz;
- t->ret = 1;
- if (!sot->check_fd) {
- if (*sot->eof)
- t->ret = -E_STDOUT_EOF;
+ t->error = 0;
+ ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
+ if (ret < 0)
+ goto out;
+ if (ret == 0)
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)
+
+ for (;;) {
+ sz = btr_next_buffer(btrn, &buf);
+ if (sz == 0)
+ break;
+ ret = write_nonblock(STDOUT_FILENO, buf, sz);
+ if (ret <= 0)
+ break;
+ btr_consume(btrn, ret);
+ }
+out:
+ if (ret < 0)
+ btr_remove_node(btrn);
+ t->error = ret;
+}
+/**
+ * Initialize a stdout task structure with default values.
+ *
+ * \param sot The stdout task structure.
+ *
+ * This fills in the pre/post select function pointers of the task structure
+ * given by \a sot and sets the stdout file descriptor to nonblocking mode.
+ */
+void stdout_set_defaults(struct stdout_task *sot)
+{
+ int ret;
+
+ sot->task.pre_select = stdout_pre_select;
+ sot->task.post_select = stdout_post_select;
+ sprintf(sot->task.status, "stdout");
+ ret = mark_fd_nonblocking(STDOUT_FILENO);
+ if (ret >= 0)
return;
- *sot->loaded -= ret;
- t->ret = 1;
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
}