ce0d22093486281f4fd489c2fcb07d0bb25ef01c
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() */
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
= container_of(t
, struct stdout_task
, task
);
36 if (*sot
->input_error
< 0) {
37 t
->error
= *sot
->input_error
;
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
= container_of(t
, struct stdout_task
, task
);
65 if (!*sot
->loaded
&& *sot
->input_error
< 0)
66 t
->error
= *sot
->input_error
;
69 if (!FD_ISSET(STDOUT_FILENO
, &s
->wfds
))
71 ret
= write(STDOUT_FILENO
, sot
->buf
, *sot
->loaded
);
73 t
->error
= -ERRNO_TO_PARA_ERROR(errno
);
78 memmove(sot
->buf
, sot
->buf
+ ret
, *sot
->loaded
);
82 * Initialize a stdout task structure with default values.
84 * \param sot The stdout task structure.
86 * This fills in the pre/post select function poinzters of the task structure
89 void stdout_set_defaults(struct stdout_task
*sot
)
93 sot
->task
.pre_select
= stdout_pre_select
;
94 sot
->task
.post_select
= stdout_post_select
;
95 sprintf(sot
->task
.status
, "stdout writer");
96 ret
= mark_fd_nonblocking(STDOUT_FILENO
);
99 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));