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
);
36 if (sit
->loaded
>= sit
->bufsize
)
39 para_fd_set(STDIN_FILENO
, &s
->rfds
, &s
->max_fileno
);
43 * The post select function of the stdin task.
45 * \param s The scheduler this task was registered to.
46 * \param t The task structure of the stdin task.
48 * This function checks if \p STDIN_FILENO was included by in the read fd set
49 * of \a s during the previous pre_select call. If yes, and \p STDIN_FILENO
50 * appears to be readable, data is read from stdin into the buffer of the
53 static void stdin_post_select(struct sched
*s
, struct task
*t
)
55 struct stdin_task
*sit
= container_of(t
, struct stdin_task
, task
);
61 if (!FD_ISSET(STDIN_FILENO
, &s
->rfds
))
63 ret
= read(STDIN_FILENO
, sit
->buf
+ sit
->loaded
, sit
->bufsize
- sit
->loaded
);
65 t
->error
= ERRNO_TO_PARA_ERROR(errno
);
69 t
->error
= -E_STDIN_EOF
;
73 * Initialize a stdin task structure with default values.
75 * \param sit The stdin task structure.
77 * This fills in the pre/post select function pointers of the task structure
78 * given by \a sit. It also sets up a default error handler which unregisters
79 * the task. Moreover, \a loaded and \a eof are set to zero and \a bufsize is
80 * initialized to 16 KB (but no buffer is allocated).
82 void stdin_set_defaults(struct stdin_task
*sit
)
86 sit
->bufsize
= 16 * 1024,
88 sit
->task
.pre_select
= stdin_pre_select
;
89 sit
->task
.post_select
= stdin_post_select
;
90 sprintf(sit
->task
.status
, "stdin reader");
91 ret
= mark_fd_nonblocking(STDIN_FILENO
);
94 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));