Skip btr suffix from {pre,post}_select_btr().
[paraslash.git] / file_write.c
1 /*
2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file file_write.c simple output plugin for testing purposes */
8
9 #include <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12 #include <sys/time.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "write.h"
21 #include "write_common.h"
22 #include "string.h"
23 #include "fd.h"
24 #include "file_write.cmdline.h"
25 #include "error.h"
26
27 /** Data specific to the file writer. */
28 struct private_file_write_data {
29 /** The file descriptor of the output file. */
30 int fd;
31 };
32
33 /*
34 * Get a random filename.
35 *
36 * This is by no means a secure way to create temporary files in a hostile
37 * directory like \p /tmp. However, we use it only for creating temp files in
38 * ~/.paraslash, for which it is OK. Result must be freed by the caller.
39 */
40 __must_check __malloc static char *random_filename(void)
41 {
42 char *result, *home = para_homedir();
43 struct timeval tv;
44
45 gettimeofday(&tv, NULL);
46 srandom(tv.tv_usec);
47 result = make_message("%s/.paraslash/%08lu", home,
48 para_random(99999999));
49 free(home);
50 return result;
51 }
52
53 static int file_write_open(struct writer_node *wn)
54 {
55 struct private_file_write_data *pfwd = para_calloc(
56 sizeof(struct private_file_write_data));
57 struct file_write_args_info *conf = wn->conf;
58 char *filename;
59
60 if (conf->filename_given)
61 filename = conf->filename_arg;
62 else
63 filename = random_filename();
64 wn->private_data = pfwd;
65 pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
66 if (!conf->filename_given)
67 free(filename);
68 if (pfwd->fd >= 0)
69 return 1;
70 free(pfwd);
71 return -E_FW_OPEN;
72 }
73
74 static void file_write_pre_select(struct sched *s, struct task *t)
75 {
76 struct writer_node *wn = container_of(t, struct writer_node, task);
77 struct private_file_write_data *pfwd = wn->private_data;
78 int ret;
79
80 t->error = 0;
81 ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
82 if (ret > 0)
83 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
84 else if (ret < 0)
85 sched_min_delay(s);
86 }
87
88 static void file_write_close(struct writer_node *wn)
89 {
90 struct private_file_write_data *pfwd = wn->private_data;
91
92 close(pfwd->fd);
93 free(pfwd);
94 }
95
96 static void file_write_post_select(__a_unused struct sched *s,
97 struct task *t)
98 {
99 struct writer_node *wn = container_of(t, struct writer_node, task);
100 struct private_file_write_data *pfwd = wn->private_data;
101 struct btr_node *btrn = wn->btrn;
102 int ret;
103 char *buf;
104 size_t bytes;
105
106 t->error = 0;
107 ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
108 if (ret <= 0)
109 goto out;
110 if (!FD_ISSET(pfwd->fd, &s->wfds))
111 return;
112 bytes = btr_next_buffer(btrn, &buf);
113 assert(bytes > 0);
114 //PARA_INFO_LOG("writing %zu\n", bytes);
115 ret = write(pfwd->fd, buf, bytes);
116 if (ret < 0)
117 goto out;
118 btr_consume(btrn, ret);
119 out:
120 if (ret < 0)
121 btr_remove_node(btrn);
122 t->error = ret;
123 }
124
125 __malloc static void *file_write_parse_config(const char *options)
126 {
127 struct file_write_args_info *conf
128 = para_calloc(sizeof(struct file_write_args_info));
129 int ret = file_cmdline_parser_string(options, conf, "file_write");
130
131 PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
132 if (!ret)
133 return conf;
134 free(conf);
135 return NULL;
136 }
137
138 static void file_write_free_config(void *conf)
139 {
140 file_cmdline_parser_free(conf);
141 }
142
143 /** the init function of the file writer */
144 void file_write_init(struct writer *w)
145 {
146 struct file_write_args_info dummy;
147
148 file_cmdline_parser_init(&dummy);
149 w->open = file_write_open;
150 w->pre_select = file_write_pre_select;
151 w->post_select = file_write_post_select;
152 w->parse_config = file_write_parse_config;
153 w->free_config = file_write_free_config;
154 w->close = file_write_close;
155 w->shutdown = NULL; /* nothing to do */
156 w->help = (struct ggo_help) {
157 .short_help = file_write_args_info_help,
158 .detailed_help = file_write_args_info_detailed_help
159 };
160 file_cmdline_parser_free(&dummy);
161 }