X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=stdin.c;h=20b9250e9b7fbf3c252e20dff8891bfeeb5112dd;hp=8eb86dee69ba7322524e960bba6169916e9bef14;hb=75602d559d3dd57d704839b817377646722bfed8;hpb=7205bdd68b0ad3c50bbe7b5e01eb62be97aab5c8

diff --git a/stdin.c b/stdin.c
index 8eb86dee..20b9250e 100644
--- a/stdin.c
+++ b/stdin.c
@@ -1,13 +1,13 @@
 /*
- * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2013 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 <regex.h>
 
 #include "para.h"
 #include "list.h"
@@ -15,6 +15,8 @@
 #include "fd.h"
 #include "error.h"
 #include "stdin.h"
+#include "buffer_tree.h"
+#include "string.h"
 
 /**
  * The pre_select function of the stdin task.
@@ -29,17 +31,16 @@
 static void stdin_pre_select(struct sched *s, struct task *t)
 {
 	struct stdin_task *sit = container_of(t, struct stdin_task, task);
+	int ret;
 
-	if (sit->output_error && *sit->output_error < 0) {
-		t->error = *sit->output_error;
-		return;
-	}
-	t->error = 0;
-	sit->check_fd = 0;
-	if (sit->loaded >= sit->bufsize)
+	ret = btr_node_status(sit->btrn, 0, BTR_NT_ROOT);
+	if (ret < 0)
+		sched_min_delay(s);
+	if (ret <= 0)
 		return;
-	sit->check_fd = 1;
-	para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
+	if (btr_pool_unused(sit->btrp) > 0)
+		return para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
+	sched_request_timeout_ms(100, s);
 }
 
 /**
@@ -50,30 +51,47 @@ static void stdin_pre_select(struct sched *s, struct task *t)
  *
  * 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 into the buffer of the
- * stdin task.
+ * 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)
+static int stdin_post_select(struct sched *s, struct task *t)
 {
 	struct stdin_task *sit = container_of(t, struct stdin_task, task);
 	ssize_t ret;
+	size_t sz, n;
+	char *buf = NULL;
 
-	if (sit->output_error && *sit->output_error < 0) {
-		t->error = *sit->output_error;
-		return;
-	}
-	t->error = 0;
-	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);
+	ret = btr_node_status(sit->btrn, 0, BTR_NT_ROOT);
 	if (ret < 0)
-		t->error = ERRNO_TO_PARA_ERROR(errno);
-	else if (ret > 0)
-		sit->loaded += ret;
-	else
-		t->error = -E_STDIN_EOF;
+		goto err;
+	if (ret == 0)
+		return 0;
+	sz = btr_pool_get_buffer(sit->btrp, &buf);
+	if (sz == 0)
+		return 0;
+	if (sit->must_set_nonblock_flag) {
+		ret = mark_fd_nonblocking(STDIN_FILENO);
+		if (ret < 0)
+			goto err;
+		sit->must_set_nonblock_flag = false;
+	}
+	/*
+	 * 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 0;
+err:
+	btr_remove_node(&sit->btrn);
+	/* Revert to blocking mode if necessary. */
+	fcntl(STDIN_FILENO, F_SETFL, sit->fd_flags);
+	//btr_pool_free(sit->btrp);
+	return ret;
 }
 
 /**
@@ -82,21 +100,28 @@ static void stdin_post_select(struct sched *s, struct task *t)
  * \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 bufsize is initialized to 16 KB (but no buffer is allocated).
+ * given by \a sit and creates a buffer tree for I/O.
  */
 void stdin_set_defaults(struct stdin_task *sit)
 {
 	int ret;
 
-	sit->bufsize = 16 * 1024,
 	sit->task.pre_select = stdin_pre_select;
 	sit->task.post_select = stdin_post_select;
+	sit->btrp = btr_pool_new("stdin", 128 * 1024);
 	sprintf(sit->task.status, "stdin reader");
-	ret = mark_fd_nonblocking(STDIN_FILENO);
-	if (ret >= 0)
-		return;
-	sit->output_error = NULL;
-	PARA_EMERG_LOG("%s\n", para_strerror(-ret));
-	exit(EXIT_FAILURE);
+	/*
+	 * Both STDIN_FILENO and STDOUT_FILENO may refer to the same open file
+	 * description (the terminal), and thus share the same file status
+	 * flags. In order to not interfere with the stdout task, we only get
+	 * the file status flags for STDIN here and save a copy. The nonblock
+	 * flag is set later on the first read.
+	 */
+	ret = fcntl(STDIN_FILENO, F_GETFL);
+	if (ret < 0) {
+		PARA_EMERG_LOG("F_GETFL: %s\n", strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	sit->fd_flags = ret;
+	sit->must_set_nonblock_flag = (sit->fd_flags & O_NONBLOCK) == 0;
 }