2 * Copyright (C) 2006-2013 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
);
33 ret
= btr_node_status(sot
->btrn
, 0, BTR_NT_LEAF
);
35 para_fd_set(STDOUT_FILENO
, &s
->wfds
, &s
->max_fileno
);
41 * The post select function of the stdout task.
43 * \param s The scheduler this task was registered to.
44 * \param t The task structure of the stdout task.
46 * This function writes input data from the buffer tree to stdout if \p
47 * STDOUT_FILENO is writable.
49 static int stdout_post_select(struct sched
*s
, struct task
*t
)
51 struct stdout_task
*sot
= container_of(t
, struct stdout_task
, task
);
52 struct btr_node
*btrn
= sot
->btrn
;
57 ret
= btr_node_status(btrn
, 0, BTR_NT_LEAF
);
62 if (!FD_ISSET(STDOUT_FILENO
, &s
->wfds
))
65 if (sot
->must_set_nonblock_flag
) {
66 ret
= mark_fd_nonblocking(STDOUT_FILENO
);
69 sot
->must_set_nonblock_flag
= false;
72 sz
= btr_next_buffer(btrn
, &buf
);
75 ret
= xwrite(STDOUT_FILENO
, buf
, sz
);
78 btr_consume(btrn
, ret
);
82 btr_remove_node(&sot
->btrn
);
83 /* Revert to blocking mode if necessary. */
84 fcntl(STDOUT_FILENO
, F_SETFL
, sot
->fd_flags
);
89 * Initialize a stdout task structure with default values.
91 * \param sot The stdout task structure.
93 * This fills in the pre/post select function pointers of the task structure
96 void stdout_set_defaults(struct stdout_task
*sot
)
100 sot
->task
.pre_select
= stdout_pre_select
;
101 sot
->task
.post_select
= stdout_post_select
;
102 sprintf(sot
->task
.status
, "stdout");
104 /* See stdin.c for details. */
105 ret
= fcntl(STDOUT_FILENO
, F_GETFL
);
107 PARA_EMERG_LOG("F_GETFL: %s\n", strerror(errno
));
111 sot
->must_set_nonblock_flag
= (sot
->fd_flags
& O_NONBLOCK
) == 0;