2 * Copyright (C) 2006-2012 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. */
17 #include "buffer_tree.h"
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 input data available, it
26 * 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
);
34 ret
= btr_node_status(sot
->btrn
, 0, BTR_NT_LEAF
);
36 para_fd_set(STDOUT_FILENO
, &s
->wfds
, &s
->max_fileno
);
42 * The post select function of the stdout task.
44 * \param s The scheduler this task was registered to.
45 * \param t The task structure of the stdout task.
47 * This function writes input data from the buffer tree to stdout if \p
48 * STDOUT_FILENO is writable.
50 static void stdout_post_select(struct sched
*s
, struct task
*t
)
52 struct stdout_task
*sot
= container_of(t
, struct stdout_task
, task
);
53 struct btr_node
*btrn
= sot
->btrn
;
59 ret
= btr_node_status(btrn
, 0, BTR_NT_LEAF
);
64 if (!FD_ISSET(STDOUT_FILENO
, &s
->wfds
))
68 sz
= btr_next_buffer(btrn
, &buf
);
71 ret
= write_nonblock(STDOUT_FILENO
, buf
, sz
);
74 btr_consume(btrn
, ret
);
78 btr_remove_node(btrn
);
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 pointers of the task structure
87 * given by \a sot and sets the stdout file descriptor to nonblocking mode.
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");
96 ret
= mark_fd_nonblocking(STDOUT_FILENO
);
99 PARA_EMERG_LOG("%s\n", para_strerror(-ret
));