2 * Copyright (C) 2006 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 * the pre_select function of the stdout task
20 * \param s the scheduler this task was registered to
21 * \param t the task structure of the stdout task
23 * This function is always successful. If there is data available in the input
24 * buffer, it adds \p STDOUT_FILENO to the write fd set of \a s.
26 void stdout_pre_select(struct sched *s, struct task *t)
28 struct stdout_task *sot = t->private_data;
33 if (*sot->input_eof) {
34 t->ret = -E_STDOUT_EOF;
35 s->timeout.tv_sec = 0;
36 s->timeout.tv_usec = 1;
41 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
45 * the post select function of the stdout task
47 * \param s the scheduler this task was registered to
48 * \param t the task structure of the stdout task
50 * This function checks if \p STDOUT_FILENO was included by in the write fd set
51 * of \a s during the previous pre_select call. If yes, and \p STDOUT_FILENO
52 * appeears to be writable, the data loaded in the input buffer is written to
55 void stdout_post_select(struct sched *s, struct task *t)
57 struct stdout_task *sot = t->private_data;
63 t->ret = -E_STDOUT_EOF;
66 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
68 t->ret = -E_STDOUT_WRITE;
69 ret = write(STDOUT_FILENO, sot->buf, *sot->loaded);
74 memmove(sot->buf, sot->buf + ret, *sot->loaded);
78 static void stdout_default_event_handler(struct task *t)
80 PARA_NOTICE_LOG("%p: %s\n", t, PARA_STRERROR(-t->ret));
85 * initialize a stdout task structure with default values
87 * \param sot the stdout task structure
89 * This fills in the pre/post select function poinzters of the task structure
90 * given by \a sot. It also sets up a default error handler which unregisters
91 * the task on errors and clears the eof flag of \a sot.
93 void stdout_set_defaults(struct stdout_task *sot)
95 sot->task.private_data = sot;
96 sot->task.pre_select = stdout_pre_select;
97 sot->task.post_select = stdout_post_select;
98 sot->task.event_handler = stdout_default_event_handler;
100 mark_fd_nonblock(STDOUT_FILENO);
101 sprintf(sot->task.status, "stdout writer");