2 * Copyright (C) 2006-2014 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. */
17 #include "buffer_tree.h"
20 * The pre_select function of the stdout task.
22 * \param s The scheduler this task was registered to.
23 * \param t The task structure of the stdout task.
25 * This function is always successful. If there is input data available, it
26 * adds \p STDOUT_FILENO to the write fd set of \a s.
28 static void stdout_pre_select(struct sched *s, struct task *t)
30 struct stdout_task *sot = task_context(t);
33 ret = btr_node_status(sot->btrn, 0, BTR_NT_LEAF);
35 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
41 * The post select function of the stdout task.
43 * \param s The scheduler this task was registered to.
44 * \param t The task structure of the stdout task.
46 * This function writes input data from the buffer tree to stdout if \p
47 * STDOUT_FILENO is writable.
49 static int stdout_post_select(struct sched *s, struct task *t)
51 struct stdout_task *sot = task_context(t);
52 struct btr_node *btrn = sot->btrn;
57 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
62 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
65 if (sot->must_set_nonblock_flag) {
66 ret = mark_fd_nonblocking(STDOUT_FILENO);
69 sot->must_set_nonblock_flag = false;
72 sz = btr_next_buffer(btrn, &buf);
75 ret = xwrite(STDOUT_FILENO, buf, sz);
78 btr_consume(btrn, ret);
82 btr_remove_node(&sot->btrn);
83 /* Revert to blocking mode if necessary. */
84 fcntl(STDOUT_FILENO, F_SETFL, sot->fd_flags);
90 * Register a stdout task structure.
92 * \param sot The stdout task structure to register.
93 * \param s The task will be added to this scheduler's task list.
95 * This sets up \a sot and registers a task with \a sot as context pointer.
97 void stdout_task_register(struct stdout_task *sot, struct sched *s)
100 struct task_info ti = {
101 .pre_select = stdout_pre_select,
102 .post_select = stdout_post_select,
107 /* See stdin.c for details. */
108 ret = fcntl(STDOUT_FILENO, F_GETFL);
110 PARA_EMERG_LOG("F_GETFL: %s\n", strerror(errno));
114 sot->must_set_nonblock_flag = (sot->fd_flags & O_NONBLOCK) == 0;
115 sot->task = task_register(&ti, s);