2 * Copyright (C) 2006-2009 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. */
9 #include <dirent.h> /* readdir() */
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 data available in the input
26 * buffer, it 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 = container_of(t, struct stdout_task, task);
35 if (*sot->input_error < 0) {
36 t->error = *sot->input_error;
37 s->timeout.tv_sec = 0;
38 s->timeout.tv_usec = 1;
43 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
47 * The post select function of the stdout task.
49 * \param s The scheduler this task was registered to.
50 * \param t The task structure of the stdout task.
52 * This function checks if \p STDOUT_FILENO was included by in the write fd set
53 * of \a s during the previous pre_select call. If yes, and \p STDOUT_FILENO
54 * appeears to be writable, the data loaded in the input buffer is written to
57 static void stdout_post_select(struct sched *s, struct task *t)
59 struct stdout_task *sot = container_of(t, struct stdout_task, task);
64 if (!*sot->loaded && *sot->input_error < 0)
65 t->error = *sot->input_error;
68 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
70 ret = write(STDOUT_FILENO, *sot->bufp, *sot->loaded);
72 t->error = -ERRNO_TO_PARA_ERROR(errno);
77 memmove(*sot->bufp, *sot->bufp + ret, *sot->loaded);
81 * Initialize a stdout task structure with default values.
83 * \param sot The stdout task structure.
85 * This fills in the pre/post select function poinzters of the task structure
88 void stdout_set_defaults(struct stdout_task *sot)
92 sot->task.pre_select = stdout_pre_select;
93 sot->task.post_select = stdout_post_select;
94 sprintf(sot->task.status, "stdout writer");
95 ret = mark_fd_nonblocking(STDOUT_FILENO);
98 PARA_EMERG_LOG("%s\n", para_strerror(-ret));