convert para_audiod to the new scheduler.
[paraslash.git] / file_writer.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file file_writer.c simple output plugin for testing purposes */
20
21 #include "para.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "write.h"
25 #include "string.h"
26 #include "fd.h"
27 #include "error.h"
28
29 /** data specific to the file writer */
30 struct private_file_writer_data {
31 /** the file descriptor of the output file */
32 int fd;
33 int check_fd;
34 };
35
36 static int file_writer_open(struct writer_node *wn)
37 {
38 struct private_file_writer_data *pfwd = para_calloc(
39 sizeof(struct private_file_writer_data));
40 char *tmp = para_tmpname(), *home = para_homedir(),
41 *filename = make_message("%s/.paraslash/%s", home, tmp);
42
43 free(home);
44 free(tmp);
45 wn->private_data = pfwd;
46 pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
47 free(filename);
48 if (pfwd->fd >= 0)
49 return 8192;
50 free(pfwd);
51 return -E_FW_OPEN;
52 }
53
54 static int file_writer_write(char *data, size_t nbytes, struct writer_node *wn)
55 {
56 struct private_file_writer_data *pfwd = wn->private_data;
57 int ret = write(pfwd->fd, data, nbytes);
58 if (ret < 0)
59 ret = -E_FW_WRITE;
60 return ret;
61 }
62
63 static void file_writer_pre_select(struct sched *s, struct task *t)
64 {
65 struct writer_node *wn = t->private_data;
66 struct private_file_writer_data *pfwd = wn->private_data;
67 struct writer_node_group *wng = wn->wng;
68
69 // PARA_INFO_LOG("task %p check_fd: %d\n", t, pfwd->check_fd);
70 pfwd->check_fd = 0;
71 t->ret = -E_FW_NO_FILE;
72 if (pfwd->fd <= 0)
73 return;
74 t->ret = 0;
75 if (!*wng->loaded)
76 return;
77 t->ret = 1;
78 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
79 pfwd->check_fd = 1;
80 }
81
82 static void file_writer_post_select(struct sched *s, struct task *t)
83 {
84 struct writer_node *wn = t->private_data;
85 struct private_file_writer_data *pfwd = wn->private_data;
86 struct writer_node_group *wng = wn->wng;
87
88 t->ret = 0;
89 if (!pfwd->check_fd)
90 return;
91 if (!*wng->loaded)
92 return;
93 if (!FD_ISSET(pfwd->fd, &s->wfds))
94 return;
95 // PARA_INFO_LOG("writing %zd\n", *wng->loaded);
96 t->ret = write(pfwd->fd, wng->buf, *wng->loaded);
97 if (t->ret < 0)
98 t->ret = -E_FW_WRITE;
99 }
100
101 static void file_writer_close(struct writer_node *wn)
102 {
103 struct private_file_writer_data *pfwd = wn->private_data;
104 close(pfwd->fd);
105 free(pfwd);
106 }
107
108 /** the init function of the file writer */
109 void file_writer_init(struct writer *w)
110 {
111 w->open = file_writer_open;
112 w->write = file_writer_write;
113 w->pre_select = file_writer_pre_select;
114 w->post_select = file_writer_post_select;
115 w->close = file_writer_close;
116 w->shutdown = NULL; /* nothing to do */
117 }