audiod: Kill noisy debug message.
[paraslash.git] / stdout.c
index af59807..16e1646 100644 (file)
--- a/stdout.c
+++ b/stdout.c
+/*
+ * Copyright (C) 2006-2009 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 data available in the input
+ * buffer, 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);
 
-       t->ret = 1;
+       t->error = 0;
        sot->check_fd = 0;
-       if (!*sot->loaded)
+       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);
 }
 
-void stdout_post_select(struct sched *s, struct task *t)
+static void stdout_pre_select_btr(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;
+       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) {
+               s->timeout.tv_sec = 0;
+               s->timeout.tv_usec = 1;
+       }
+}
+
+/**
+ * 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 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.
+ */
+static void stdout_post_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);
        ssize_t ret;
 
-       t->ret = 1;
+       t->error = 0;
        if (!sot->check_fd) {
-               if (*sot->eof)
-                       t->ret = -E_STDOUT_EOF;
+               if (!*sot->loaded && *sot->input_error < 0)
+                       t->error = *sot->input_error;
                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)
+       ret = write(STDOUT_FILENO, *sot->bufp, *sot->loaded);
+       if (ret < 0) {
+               t->error = -ERRNO_TO_PARA_ERROR(errno);
                return;
+       }
        *sot->loaded -= ret;
-       t->ret = 1;
+       if (*sot->loaded)
+               memmove(*sot->bufp, *sot->bufp + ret, *sot->loaded);
 }
 
-void stdout_default_event_handler(struct task *t)
+static void stdout_post_select_btr(struct sched *s, struct task *t)
 {
-       PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
-       unregister_task(t);
-}
-
+       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->error = 0;
+       ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
+       if (ret < 0)
+               goto err;
+       if (ret == 0)
+               return;
+       if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
+               return;
+       sz = btr_next_buffer(btrn, &buf);
+       assert(sz > 0);
+       ret = write_nonblock(STDOUT_FILENO, buf, sz, 0);
+       if (ret < 0)
+               goto err;
+       btr_consume(btrn, ret);
+       return;
+err:
+       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.
+ */
 void stdout_set_defaults(struct stdout_task *sot)
 {
-       sot->task.private_data = sot;
-       sot->task.pre_select = stdout_pre_select;
-       sot->task.post_select = stdout_post_select;
-       sot->task.event_handler = stdout_default_event_handler;
-       sot->task.flags = 0;
+       int ret;
+
+       if (sot->btrn) {
+               sot->task.pre_select = stdout_pre_select_btr;
+               sot->task.post_select = stdout_post_select_btr;
+       } else {
+               sot->task.pre_select = stdout_pre_select;
+               sot->task.post_select = stdout_post_select;
+       }
        sprintf(sot->task.status, "stdout writer");
+       ret = mark_fd_nonblocking(STDOUT_FILENO);
+       if (ret >= 0)
+               return;
+       PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+       exit(EXIT_FAILURE);
 }