2 * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file stdout.c Functions that deal with writing to stdout. */
18 #include "buffer_tree.h"
21 * The pre_select function of the stdout task.
23 * \param s The scheduler this task was registered to.
24 * \param t The task structure of the stdout task.
26 * This function is always successful. If there is input data available, it
27 * adds \p STDOUT_FILENO to the write fd set of \a s.
29 static void stdout_pre_select(struct sched *s, struct task *t)
31 struct stdout_task *sot = container_of(t, struct stdout_task, task);
35 ret = btr_node_status(sot->btrn, 0, BTR_NT_LEAF);
37 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
43 * The post select function of the stdout task.
45 * \param s The scheduler this task was registered to.
46 * \param t The task structure of the stdout task.
48 * This function writes input data from the buffer tree to stdout if \p
49 * STDOUT_FILENO is writable.
51 static void stdout_post_select(struct sched *s, struct task *t)
53 struct stdout_task *sot = container_of(t, struct stdout_task, task);
54 struct btr_node *btrn = sot->btrn;
60 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
65 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
69 sz = btr_next_buffer(btrn, &buf);
72 ret = write_nonblock(STDOUT_FILENO, buf, sz);
75 btr_consume(btrn, ret);
79 btr_remove_node(btrn);
83 * Initialize a stdout task structure with default values.
85 * \param sot The stdout task structure.
87 * This fills in the pre/post select function pointers of the task structure
88 * given by \a sot and sets the stdout file descriptor to nonblocking mode.
90 void stdout_set_defaults(struct stdout_task *sot)
94 sot->task.pre_select = stdout_pre_select;
95 sot->task.post_select = stdout_post_select;
96 sprintf(sot->task.status, "stdout");
97 ret = mark_fd_nonblocking(STDOUT_FILENO);
100 PARA_EMERG_LOG("%s\n", para_strerror(-ret));