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 */
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
= t
->private_data
;
36 if (*sot
->input_eof
) {
37 t
->ret
= -E_STDOUT_EOF
;
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
= t
->private_data
;
66 t
->ret
= -E_STDOUT_EOF
;
69 if (!FD_ISSET(STDOUT_FILENO
, &s
->wfds
))
71 t
->ret
= -E_STDOUT_WRITE
;
72 ret
= write(STDOUT_FILENO
, sot
->buf
, *sot
->loaded
);
77 memmove(sot
->buf
, sot
->buf
+ ret
, *sot
->loaded
);
81 static void stdout_default_event_handler(struct task
*t
)
83 PARA_NOTICE_LOG("%p: %s\n", t
, PARA_STRERROR(-t
->ret
));
88 * initialize a stdout task structure with default values
90 * \param sot the stdout task structure
92 * This fills in the pre/post select function poinzters of the task structure
93 * given by \a sot. It also sets up a default error handler which unregisters
94 * the task on errors and clears the eof flag of \a sot.
96 void stdout_set_defaults(struct stdout_task
*sot
)
98 sot
->task
.private_data
= sot
;
99 sot
->task
.pre_select
= stdout_pre_select
;
100 sot
->task
.post_select
= stdout_post_select
;
101 sot
->task
.event_handler
= stdout_default_event_handler
;
103 mark_fd_nonblocking(STDOUT_FILENO
);
104 sprintf(sot
->task
.status
, "stdout writer");