2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file stdin.c Functions that deal with reading from stdin. */
9 #include <dirent.h> /* readdir() */
20 * The pre_select function of the stdin task.
22 * \param s The scheduler this task was registered to.
23 * \param t The task structure of the stdin task.
25 * This function is always successful. If there is space left in the
26 * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
29 static void stdin_pre_select(struct sched *s, struct task *t)
31 struct stdin_task *sit = container_of(t, struct stdin_task, task);
33 if (sit->output_error && *sit->output_error < 0) {
34 t->error = *sit->output_error;
39 if (sit->loaded >= sit->bufsize)
42 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
46 * The post select function of the stdin task.
48 * \param s The scheduler this task was registered to.
49 * \param t The task structure of the stdin task.
51 * This function checks if \p STDIN_FILENO was included by in the read fd set
52 * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
53 * appears to be readable, data is read from stdin into the buffer of the
56 static void stdin_post_select(struct sched *s, struct task *t)
58 struct stdin_task *sit = container_of(t, struct stdin_task, task);
61 if (sit->output_error && *sit->output_error < 0) {
62 t->error = *sit->output_error;
68 if (!FD_ISSET(STDIN_FILENO, &s->rfds))
70 ret = read(STDIN_FILENO, sit->buf + sit->loaded, sit->bufsize - sit->loaded);
72 t->error = ERRNO_TO_PARA_ERROR(errno);
76 t->error = -E_STDIN_EOF;
80 * Initialize a stdin task structure with default values.
82 * \param sit The stdin task structure.
84 * This fills in the pre/post select function pointers of the task structure
85 * given by \a sit. Moreover, the stdin file desctiptor is set to nonblocking
86 * mode and \a bufsize is initialized to 16 KB (but no buffer is allocated).
88 void stdin_set_defaults(struct stdin_task *sit)
92 sit->bufsize = 32 * 1024,
93 sit->task.pre_select = stdin_pre_select;
94 sit->task.post_select = stdin_post_select;
95 sprintf(sit->task.status, "stdin reader");
96 ret = mark_fd_nonblocking(STDIN_FILENO);
99 sit->output_error = NULL;
100 PARA_EMERG_LOG("%s\n", para_strerror(-ret));