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() */
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 data available in the input
27 * buffer, it 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);
36 if (*sot->input_error < 0) {
37 t->error = *sot->input_error;
38 s->timeout.tv_sec = 0;
39 s->timeout.tv_usec = 1;
44 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
48 * The post select function of the stdout task.
50 * \param s The scheduler this task was registered to.
51 * \param t The task structure of the stdout task.
53 * This function checks if \p STDOUT_FILENO was included by in the write fd set
54 * of \a s during the previous pre_select call. If yes, and \p STDOUT_FILENO
55 * appeears to be writable, the data loaded in the input buffer is written to
58 static void stdout_post_select(struct sched *s, struct task *t)
60 struct stdout_task *sot = container_of(t, struct stdout_task, task);
65 if (!*sot->loaded && *sot->input_error < 0)
66 t->error = *sot->input_error;
69 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
71 ret = write(STDOUT_FILENO, *sot->bufp, *sot->loaded);
73 t->error = -ERRNO_TO_PARA_ERROR(errno);
78 memmove(*sot->bufp, *sot->bufp + ret, *sot->loaded);
82 * Initialize a stdout task structure with default values.
84 * \param sot The stdout task structure.
86 * This fills in the pre/post select function poinzters of the task structure
89 void stdout_set_defaults(struct stdout_task *sot)
93 sot->task.pre_select = stdout_pre_select;
94 sot->task.post_select = stdout_post_select;
95 sprintf(sot->task.status, "stdout writer");
96 ret = mark_fd_nonblocking(STDOUT_FILENO);
99 PARA_EMERG_LOG("%s\n", para_strerror(-ret));