2 * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file stdout.c Functions that deal with writing to stdout. */
15 #include "buffer_tree.h"
17 /* Add STDOUT_FILENO to the write fd set if there is input data available. */
18 static void stdout_pre_select(struct sched *s, void *context)
20 struct stdout_task *sot = context;
23 ret = btr_node_status(sot->btrn, 0, BTR_NT_LEAF);
25 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
31 * This function writes input data from the buffer tree to stdout if
32 * STDOUT_FILENO is writable.
34 static int stdout_post_select(struct sched *s, void *context)
36 struct stdout_task *sot = context;
37 struct btr_node *btrn = sot->btrn;
42 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
47 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
50 if (sot->must_set_nonblock_flag) {
51 ret = mark_fd_nonblocking(STDOUT_FILENO);
54 sot->must_set_nonblock_flag = false;
57 sz = btr_next_buffer(btrn, &buf);
60 ret = xwrite(STDOUT_FILENO, buf, sz);
63 btr_consume(btrn, ret);
67 btr_remove_node(&sot->btrn);
68 /* Revert to blocking mode if necessary. */
69 fcntl(STDOUT_FILENO, F_SETFL, sot->fd_flags);
75 * Register a stdout task structure.
77 * \param sot The stdout task structure to register.
78 * \param s The task will be added to this scheduler's task list.
80 * This sets up \a sot and registers a task with \a sot as context pointer.
82 void stdout_task_register(struct stdout_task *sot, struct sched *s)
85 struct task_info ti = {
86 .pre_select = stdout_pre_select,
87 .post_select = stdout_post_select,
92 /* See stdin.c for details. */
93 ret = fcntl(STDOUT_FILENO, F_GETFL);
95 PARA_EMERG_LOG("F_GETFL: %s\n", strerror(errno));
99 sot->must_set_nonblock_flag = (sot->fd_flags & O_NONBLOCK) == 0;
100 sot->task = task_register(&ti, s);