2 * Copyright (C) 2006 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 */
18 * the pre_select function of the stdout task
20 * \param s the scheduler this task was registered to
21 * \param t the task structure of the stdout task
23 * This function is always successful. If there is data available in the input
24 * buffer, it adds \p STDOUT_FILENO to the write fd set of \a s.
26 void stdout_pre_select(struct sched
*s
, struct task
*t
)
28 struct stdout_task
*sot
= t
->private_data
;
33 if (*sot
->input_eof
) {
34 t
->ret
= -E_STDOUT_EOF
;
35 s
->timeout
.tv_sec
= 0;
36 s
->timeout
.tv_usec
= 1;
41 para_fd_set(STDOUT_FILENO
, &s
->wfds
, &s
->max_fileno
);
45 * the post select function of the stdout task
47 * \param s the scheduler this task was registered to
48 * \param t the task structure of the stdout task
50 * This function checks if \p STDOUT_FILENO was included by in the write fd set
51 * of \a s during the previous pre_select call. If yes, and \p STDOUT_FILENO
52 * appeears to be writable, the data loaded in the input buffer is written to
55 void stdout_post_select(struct sched
*s
, struct task
*t
)
57 struct stdout_task
*sot
= t
->private_data
;
63 t
->ret
= -E_STDOUT_EOF
;
66 if (!FD_ISSET(STDOUT_FILENO
, &s
->wfds
))
68 t
->ret
= -E_STDOUT_WRITE
;
69 ret
= write(STDOUT_FILENO
, sot
->buf
, *sot
->loaded
);
74 memmove(sot
->buf
, sot
->buf
+ ret
, *sot
->loaded
);
78 static void stdout_default_event_handler(struct task
*t
)
80 PARA_NOTICE_LOG("%p: %s\n", t
, PARA_STRERROR(-t
->ret
));
85 * initialize a stdout task structure with default values
87 * \param sot the stdout task structure
89 * This fills in the pre/post select function poinzters of the task structure
90 * given by \a sot. It also sets up a default error handler which unregisters
91 * the task on errors and clears the eof flag of \a sot.
93 void stdout_set_defaults(struct stdout_task
*sot
)
95 sot
->task
.private_data
= sot
;
96 sot
->task
.pre_select
= stdout_pre_select
;
97 sot
->task
.post_select
= stdout_post_select
;
98 sot
->task
.event_handler
= stdout_default_event_handler
;
100 mark_fd_nonblock(STDOUT_FILENO
);
101 sprintf(sot
->task
.status
, "stdout writer");