Rename write_nonblock() to xwrite().

[paraslash.git] / stdout.c

diff --git a/stdout.c b/stdout.c
index d64586bccd9cdd12ffe743247680d8686ee1c002..abe7abc98df759af034872be4d65ed9a30133207 100644 (file)
--- a/stdout.c
+++ b/stdout.c
@@ -1,12 +1,11 @@
 /*
- * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2012 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 "para.h"
@@ -15,6 +14,7 @@
 #include "fd.h"
 #include "error.h"
 #include "stdout.h"
+#include "buffer_tree.h"
 
 /**
  * The pre_select function of the stdout task.
@@ -22,25 +22,20 @@
  * \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.
+ * 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 = container_of(t, struct stdout_task, task);
+       int ret;
 
        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);
+       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);
 }
 
 /**
@@ -49,41 +44,47 @@ static void stdout_pre_select(struct sched *s, struct task *t)
  * \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.
+ * 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 = container_of(t, struct stdout_task, task);
-       ssize_t ret;
+       struct btr_node *btrn = sot->btrn;
+       int ret;
+       char *buf;
+       size_t sz;
 
        t->error = 0;
-       if (!sot->check_fd) {
-               if (!*sot->loaded && *sot->input_error < 0)
-                       t->error = *sot->input_error;
+       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;
-       ret = write(STDOUT_FILENO, *sot->bufp, *sot->loaded);
-       if (ret < 0) {
-               t->error = -ERRNO_TO_PARA_ERROR(errno);
-               return;
+
+       for (;;) {
+               sz = btr_next_buffer(btrn, &buf);
+               if (sz == 0)
+                       break;
+               ret = xwrite(STDOUT_FILENO, buf, sz);
+               if (ret <= 0)
+                       break;
+               btr_consume(btrn, ret);
        }
-       *sot->loaded -= ret;
-       if (*sot->loaded)
-               memmove(*sot->bufp, *sot->bufp + ret, *sot->loaded);
+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 poinzters of the task structure
- * given by \a sot.
+ * 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)
 {
@@ -91,7 +92,7 @@ void stdout_set_defaults(struct stdout_task *sot)
 
        sot->task.pre_select = stdout_pre_select;
        sot->task.post_select = stdout_post_select;
-       sprintf(sot->task.status, "stdout writer");
+       sprintf(sot->task.status, "stdout");
        ret = mark_fd_nonblocking(STDOUT_FILENO);
        if (ret >= 0)
                return;