2 * Copyright (C) 2006-2008 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() */
22 * The pre_select function of the stdin task.
24 * \param s The scheduler this task was registered to.
25 * \param t The task structure of the stdin task.
27 * This function is always successful. If there is space left in the
28 * buffer of the stdin task, it adds \p STDIN_FILENO to the read fd set
31 static void stdin_pre_select(struct sched
*s
, struct task
*t
)
33 struct stdin_task
*sit
= container_of(t
, struct stdin_task
, task
);
35 if (sit
->output_error
&& *sit
->output_error
< 0) {
36 t
->error
= *sit
->output_error
;
41 if (sit
->loaded
>= sit
->bufsize
)
44 para_fd_set(STDIN_FILENO
, &s
->rfds
, &s
->max_fileno
);
48 * The post select function of the stdin task.
50 * \param s The scheduler this task was registered to.
51 * \param t The task structure of the stdin task.
53 * This function checks if \p STDIN_FILENO was included by in the read fd set
54 * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
55 * appears to be readable, data is read from stdin into the buffer of the
58 static void stdin_post_select(struct sched
*s
, struct task
*t
)
60 struct stdin_task
*sit
= container_of(t
, struct stdin_task
, task
);
63 if (sit
->output_error
&& *sit
->output_error
< 0) {
64 t
->error
= *sit
->output_error
;
70 if (!FD_ISSET(STDIN_FILENO
, &s
->rfds
))
72 ret
= read(STDIN_FILENO
, sit
->buf
+ sit
->loaded
, sit
->bufsize
- sit
->loaded
);
74 t
->error
= ERRNO_TO_PARA_ERROR(errno
);
78 t
->error
= -E_STDIN_EOF
;
82 * Initialize a stdin task structure with default values.
84 * \param sit The stdin task structure.
86 * This fills in the pre/post select function pointers of the task structure
87 * given by \a sit. Moreover, the stdin file desctiptor is set to nonblocking
88 * mode and \a bufsize is initialized to 16 KB (but no buffer is allocated).
90 void stdin_set_defaults(struct stdin_task
*sit
)
94 sit
->bufsize
= 16 * 1024,
95 sit
->task
.pre_select
= stdin_pre_select
;
96 sit
->task
.post_select
= stdin_post_select
;
97 sprintf(sit
->task
.status
, "stdin reader");
98 ret
= mark_fd_nonblocking(STDIN_FILENO
);
101 sit
->output_error
= NULL
;
102 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));