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() */
19 #include "buffer_tree.h"
22 * The pre_select function of the stdout task.
24 * \param s The scheduler this task was registered to.
25 * \param t The task structure of the stdout task.
27 * This function is always successful. If there is data available in the input
28 * buffer, it adds \p STDOUT_FILENO to the write fd set of \a s.
30 static void stdout_pre_select(struct sched *s, struct task *t)
32 struct stdout_task *sot = container_of(t, struct stdout_task, task);
37 if (*sot->input_error < 0) {
38 t->error = *sot->input_error;
39 s->timeout.tv_sec = 0;
40 s->timeout.tv_usec = 1;
45 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
48 static void stdout_pre_select_btr(struct sched *s, struct task *t)
50 struct stdout_task *sot = container_of(t, struct stdout_task, task);
55 ret = btr_node_status(sot->btrn, 0, BTR_NT_LEAF);
57 para_fd_set(STDOUT_FILENO, &s->wfds, &s->max_fileno);
59 s->timeout.tv_sec = 0;
60 s->timeout.tv_usec = 1;
65 * The post select function of the stdout task.
67 * \param s The scheduler this task was registered to.
68 * \param t The task structure of the stdout task.
70 * This function checks if \p STDOUT_FILENO was included by in the write fd set
71 * of \a s during the previous pre_select call. If yes, and \p STDOUT_FILENO
72 * appeears to be writable, the data loaded in the input buffer is written to
75 static void stdout_post_select(struct sched *s, struct task *t)
77 struct stdout_task *sot = container_of(t, struct stdout_task, task);
82 if (!*sot->loaded && *sot->input_error < 0)
83 t->error = *sot->input_error;
86 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
88 ret = write(STDOUT_FILENO, *sot->bufp, *sot->loaded);
90 t->error = -ERRNO_TO_PARA_ERROR(errno);
95 memmove(*sot->bufp, *sot->bufp + ret, *sot->loaded);
98 static void stdout_post_select_btr(struct sched *s, struct task *t)
100 struct stdout_task *sot = container_of(t, struct stdout_task, task);
101 struct btr_node *btrn = sot->btrn;
107 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
112 if (!FD_ISSET(STDOUT_FILENO, &s->wfds))
116 sz = btr_next_buffer(btrn, &buf);
119 ret = write_nonblock(STDOUT_FILENO, buf, sz, 0);
122 btr_consume(btrn, ret);
126 btr_remove_node(btrn);
130 * Initialize a stdout task structure with default values.
132 * \param sot The stdout task structure.
134 * This fills in the pre/post select function pointers of the task structure
137 void stdout_set_defaults(struct stdout_task *sot)
142 sot->task.pre_select = stdout_pre_select_btr;
143 sot->task.post_select = stdout_post_select_btr;
145 sot->task.pre_select = stdout_pre_select;
146 sot->task.post_select = stdout_post_select;
148 sprintf(sot->task.status, "stdout");
149 ret = mark_fd_nonblocking(STDOUT_FILENO);
152 PARA_EMERG_LOG("%s\n", para_strerror(-ret));