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() */
20 * The pre_select function of the stdout task.
22 * \param s The scheduler this task was registered to.
23 * \param t The task structure of the stdout task.
25 * This function is always successful. If there is data available in the input
26 * buffer, it adds \p STDOUT_FILENO to the write fd set of \a s.
28 static void stdout_pre_select(struct sched
*s
, struct task
*t
)
30 struct stdout_task
*sot
= container_of(t
, struct stdout_task
, task
);
35 if (*sot
->input_error
< 0) {
36 t
->error
= *sot
->input_error
;
37 s
->timeout
.tv_sec
= 0;
38 s
->timeout
.tv_usec
= 1;
43 para_fd_set(STDOUT_FILENO
, &s
->wfds
, &s
->max_fileno
);
47 * The post select function of the stdout task.
49 * \param s The scheduler this task was registered to.
50 * \param t The task structure of the stdout task.
52 * This function checks if \p STDOUT_FILENO was included by in the write fd set
53 * of \a s during the previous pre_select call. If yes, and \p STDOUT_FILENO
54 * appeears to be writable, the data loaded in the input buffer is written to
57 static void stdout_post_select(struct sched
*s
, struct task
*t
)
59 struct stdout_task
*sot
= container_of(t
, struct stdout_task
, task
);
64 if (!*sot
->loaded
&& *sot
->input_error
< 0)
65 t
->error
= *sot
->input_error
;
68 if (!FD_ISSET(STDOUT_FILENO
, &s
->wfds
))
70 ret
= write(STDOUT_FILENO
, *sot
->bufp
, *sot
->loaded
);
72 t
->error
= -ERRNO_TO_PARA_ERROR(errno
);
77 memmove(*sot
->bufp
, *sot
->bufp
+ ret
, *sot
->loaded
);
81 * Initialize a stdout task structure with default values.
83 * \param sot The stdout task structure.
85 * This fills in the pre/post select function poinzters of the task structure
88 void stdout_set_defaults(struct stdout_task
*sot
)
92 sot
->task
.pre_select
= stdout_pre_select
;
93 sot
->task
.post_select
= stdout_post_select
;
94 sprintf(sot
->task
.status
, "stdout writer");
95 ret
= mark_fd_nonblocking(STDOUT_FILENO
);
98 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));