2 * Copyright (C) 2006-2009 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. */
9 #include <dirent.h> /* readdir() */
20 * The pre_select function of the stdin task.
22 * \param s The scheduler this task was registered to.
23 * \param t The task structure of the stdin task.
25 * This function is always successful. If there is space left in the
26 * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
29 static void stdin_pre_select(struct sched
*s
, struct task
*t
)
31 struct stdin_task
*sit
= container_of(t
, struct stdin_task
, task
);
33 if (sit
->output_error
&& *sit
->output_error
< 0) {
34 t
->error
= *sit
->output_error
;
39 if (sit
->loaded
>= sit
->bufsize
)
42 para_fd_set(STDIN_FILENO
, &s
->rfds
, &s
->max_fileno
);
46 * The post select function of the stdin task.
48 * \param s The scheduler this task was registered to.
49 * \param t The task structure of the stdin task.
51 * This function checks if \p STDIN_FILENO was included by in the read fd set
52 * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
53 * appears to be readable, data is read from stdin into the buffer of the
56 static void stdin_post_select(struct sched
*s
, struct task
*t
)
58 struct stdin_task
*sit
= container_of(t
, struct stdin_task
, task
);
61 if (sit
->output_error
&& *sit
->output_error
< 0) {
62 t
->error
= *sit
->output_error
;
68 if (!FD_ISSET(STDIN_FILENO
, &s
->rfds
))
70 ret
= read(STDIN_FILENO
, sit
->buf
+ sit
->loaded
, sit
->bufsize
- sit
->loaded
);
72 t
->error
= ERRNO_TO_PARA_ERROR(errno
);
76 t
->error
= -E_STDIN_EOF
;
80 * Initialize a stdin task structure with default values.
82 * \param sit The stdin task structure.
84 * This fills in the pre/post select function pointers of the task structure
85 * given by \a sit. Moreover, the stdin file desctiptor is set to nonblocking
86 * mode and \a bufsize is initialized to 16 KB (but no buffer is allocated).
88 void stdin_set_defaults(struct stdin_task
*sit
)
92 sit
->bufsize
= 32 * 1024,
93 sit
->task
.pre_select
= stdin_pre_select
;
94 sit
->task
.post_select
= stdin_post_select
;
95 sprintf(sit
->task
.status
, "stdin reader");
96 ret
= mark_fd_nonblocking(STDIN_FILENO
);
99 sit
->output_error
= NULL
;
100 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));