X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=stdin.c;h=ca5eb0e19e56e604a59e9840231547edddf1d730;hp=ebfa6ccff23700ec6d7f235644aa8d0e2324d92b;hb=60ef885705932a682097ad2b9f2379282d814e79;hpb=40cbbb95e256e63e1e6958e9034311d4904604af

diff --git a/stdin.c b/stdin.c
index ebfa6ccf..ca5eb0e1 100644
--- a/stdin.c
+++ b/stdin.c
@@ -1,55 +1,115 @@
+/*
+ * Copyright (C) 2006-2010 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 <stdbool.h>
+#include <regex.h>
+
 #include "para.h"
-#include "string.h"
 #include "list.h"
 #include "sched.h"
 #include "fd.h"
 #include "error.h"
 #include "stdin.h"
+#include "buffer_tree.h"
+#include "string.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 */
-}
+	struct stdin_task *sit = container_of(t, struct stdin_task, task);
+	int ret;
 
-static void stdin_default_event_handler(struct task *t)
-{
-	PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
-	unregister_task(t);
+	t->error = 0;
+	ret = btr_node_status(sit->btrn, 0, BTR_NT_ROOT);
+	if (ret < 0)
+		sched_min_delay(s);
+	if (ret <= 0)
+		return;
+	if (btr_pool_unused(sit->btrp) > 0)
+		return para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
+	sched_request_timeout_ms(100, s);
 }
 
-void stdin_post_select(struct sched *s, struct 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
+ * appears to be readable, data is read from stdin and fed into the buffer
+ * tree.
+ */
+static void stdin_post_select(struct sched *s, struct task *t)
 {
-	struct stdin_task *sit = t->private_data;
+	struct stdin_task *sit = container_of(t, struct stdin_task, task);
 	ssize_t ret;
+	size_t sz, n;
+	char *buf = NULL;
 
-	t->ret = 1;
-	if (sit->loaded >= sit->bufsize)
+	t->error = 0;
+	ret = btr_node_status(sit->btrn, 0, BTR_NT_ROOT);
+	if (ret < 0)
+		goto err;
+	if (ret == 0)
 		return;
-	if (!FD_ISSET(STDIN_FILENO, &s->rfds))
+	sz = btr_pool_get_buffer(sit->btrp, &buf);
+	if (sz == 0)
 		return;
-	ret = read(STDIN_FILENO, sit->buf + sit->loaded, sit->bufsize - sit->loaded);
-	if (ret < 0)
-		t->ret = -E_STDIN_READ;
-	else if (ret > 0) {
-		sit->loaded += ret;
-		t->ret = ret;
-	} else
-		t->ret = -E_STDIN_EOF;
-	if (t->ret < 0)
-		sit->eof = 1;
+	/*
+	 * Do not use the maximal size to avoid having only a single buffer
+	 * reference for the whole pool. This is bad because if that single
+	 * reference can not be freed, we're stuck.
+	 */
+	sz = PARA_MIN(sz, btr_pool_size(sit->btrp) / 2);
+	ret = read_nonblock(STDIN_FILENO, buf, sz, &s->rfds, &n);
+	if (n > 0)
+		btr_add_output_pool(sit->btrp, n, sit->btrn);
+	if (ret >= 0)
+		return;
+err:
+	btr_remove_node(sit->btrn);
+	//btr_pool_free(sit->btrp);
+	t->error = ret;
 }
 
+/**
+ * Initialize a stdin task structure with default values.
+ *
+ * \param sit The stdin task structure.
+ *
+ * This fills in the pre/post select function pointers of the task structure
+ * given by \a sit. Moreover, the stdin file desctiptor is set to nonblocking
+ * mode, and a buffer tree is created.
+ */
 void stdin_set_defaults(struct stdin_task *sit)
 {
-	sit->bufsize = 16 * 1024,
-	sit->loaded = 0,
-	sit->task.flags = 0,
+	int ret;
+
 	sit->task.pre_select = stdin_pre_select;
 	sit->task.post_select = stdin_post_select;
-	sit->task.event_handler = stdin_default_event_handler;
-	sit->task.private_data = sit;
+	sit->btrp = btr_pool_new("stdin", 64 * 1024);
 	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);
 }