+/*
+ * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file stdin.c functions that deal with reading from stdin */
+
+#include <dirent.h> /* readdir() */
+#include <assert.h>
+
+
#include "para.h"
#include "string.h"
#include "list.h"
#include "error.h"
#include "stdin.h"
-void stdin_pre_select(struct sched *s, struct task *t)
+/**
+ * the pre_select function of the stdin task
+ *
+ * \param s the scheduler this task was registered to
+ * \param t the task structure of the stdin task
+ *
+ * This function is always successful. If there is space left in the
+ * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
+ * of \a s.
+ */
+static void stdin_pre_select(struct sched *s, struct task *t)
{
struct stdin_task *sit = t->private_data;
- if (sit->loaded < sit->bufsize)
- para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
- t->ret = 1; /* success */
+ t->ret = 1;
+ sit->check_fd = 0;
+ if (sit->loaded >= sit->bufsize)
+ return;
+ sit->check_fd = 1;
+ para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
}
-void stdin_post_select(struct sched *s, struct task *t)
+static void stdin_default_event_handler(struct task *t)
+{
+ PARA_NOTICE_LOG("%p: %s\n", t, para_strerror(-t->ret));
+ unregister_task(t);
+}
+
+/**
+ * the post select function of the stdin task
+ *
+ * \param s the scheduler this task was registered to
+ * \param t the task structure of the stdin task
+ *
+ * This function checks if \p STDIN_FILENO was included by in the read fd set
+ * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
+ * appeears to be readable, data is read from stdin into the buffer of the
+ * stdin task.
+ */
+static void stdin_post_select(struct sched *s, struct task *t)
{
struct stdin_task *sit = t->private_data;
ssize_t ret;
t->ret = 1;
- if (sit->loaded >= sit->bufsize)
+ if (!sit->check_fd)
return;
if (!FD_ISSET(STDIN_FILENO, &s->rfds))
return;
ret = read(STDIN_FILENO, sit->buf + sit->loaded, sit->bufsize - sit->loaded);
if (ret < 0)
t->ret = -E_STDIN_READ;
- else {
+ else if (ret > 0) {
sit->loaded += ret;
t->ret = ret;
- }
- sprintf(t->status,
- "%p stdin reader: loaded = %d, ret = %d",
- sit, sit->loaded, t->ret);
+ } else
+ t->ret = -E_STDIN_EOF;
+ if (t->ret < 0)
+ sit->error = t->ret;
}
-#if 0
-void stdin_init(struct stdin_task *sit)
+/**
+ * Initialize a stdin task structure with default values.
+ *
+ * \param sit The stdin task structure.
+ *
+ * This fills in the pre/post select function poinzters of the task structure
+ * given by \a sit. It also sets up a default error handler which unregisters
+ * the task. Moreover, \a loaded and \a eof are set to zero and \a bufsize is
+ * initialized to 16 KB (but no buffer is allocated).
+ */
+void stdin_set_defaults(struct stdin_task *sit)
{
- sit->task.private_data = sit;
+ int ret;
+
+ sit->bufsize = 16 * 1024,
+ sit->loaded = 0,
+ sit->error = 0,
sit->task.pre_select = stdin_pre_select;
sit->task.post_select = stdin_post_select;
- sit->task.flags = POST_EOF_IS_ERROR;
- sprintf(sit->task.status, "%p stdin reader: initialized", &sit->task);
+ sit->task.event_handler = stdin_default_event_handler;
+ sit->task.private_data = sit;
+ sprintf(sit->task.status, "stdin reader");
+ ret = mark_fd_nonblocking(STDIN_FILENO);
+ if (ret >= 0)
+ return;
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
}
-#endif