2 * Copyright (C) 2006 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 */
18 * the pre_select function of the stdin task
20 * \param s the scheduler this task was registered to
21 * \param t the task structure of the stdin task
23 * This function is always successful. If there is space left in the
24 * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
27 void stdin_pre_select(struct sched
*s
, struct task
*t
)
29 struct stdin_task
*sit
= t
->private_data
;
32 if (sit
->loaded
>= sit
->bufsize
)
35 para_fd_set(STDIN_FILENO
, &s
->rfds
, &s
->max_fileno
);
38 static void stdin_default_event_handler(struct task
*t
)
40 PARA_NOTICE_LOG("%p: %s\n", t
, PARA_STRERROR(-t
->ret
));
45 * the post select function of the stdin task
47 * \param s the scheduler this task was registered to
48 * \param t the task structure of the stdin task
50 * This function checks if \p STDIN_FILENO was included by in the read fd set
51 * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
52 * appeears to be readable, data is read from stdin into the buffer of the
55 void stdin_post_select(struct sched
*s
, struct task
*t
)
57 struct stdin_task
*sit
= t
->private_data
;
63 if (!FD_ISSET(STDIN_FILENO
, &s
->rfds
))
65 ret
= read(STDIN_FILENO
, sit
->buf
+ sit
->loaded
, sit
->bufsize
- sit
->loaded
);
67 t
->ret
= -E_STDIN_READ
;
72 t
->ret
= -E_STDIN_EOF
;
78 * initialize a stdin task structure with default values
80 * \param sit the stdin task structure
82 * This fills in the pre/post select function poinzters of the task structure
83 * given by \a sot. It also sets up a default error handler which unregisters
84 * the task. Moreover, \a loaded and \a eof are set to zero and \a bufsize is
85 * initialized to 16 KB (but no buffer is allocated).
87 void stdin_set_defaults(struct stdin_task
*sit
)
89 sit
->bufsize
= 16 * 1024,
92 sit
->task
.pre_select
= stdin_pre_select
;
93 sit
->task
.post_select
= stdin_post_select
;
94 sit
->task
.event_handler
= stdin_default_event_handler
;
95 sit
->task
.private_data
= sit
;
96 mark_fd_nonblock(STDIN_FILENO
);
97 sprintf(sit
->task
.status
, "stdin reader");