Merge branch 't/allow_zero_btr_add'
[paraslash.git] / file_write.c
1 /*
2 * Copyright (C) 2006-2013 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 <sys/time.h>
12
13 #include "para.h"
14 #include "list.h"
15 #include "sched.h"
16 #include "ggo.h"
17 #include "buffer_tree.h"
18 #include "write.h"
19 #include "write_common.h"
20 #include "string.h"
21 #include "fd.h"
22 #include "file_write.cmdline.h"
23 #include "error.h"
24
25 /** Data specific to the file writer. */
26 struct private_file_write_data {
27 /** The file descriptor of the output file. */
28 int fd;
29 };
30
31 /*
32 * Get a random filename.
33 *
34 * This is by no means a secure way to create temporary files in a hostile
35 * directory like \p /tmp. However, we use it only for creating temp files in
36 * ~/.paraslash, for which it is OK. Result must be freed by the caller.
37 */
38 __must_check __malloc static char *random_filename(void)
39 {
40 char *result, *home = para_homedir();
41 struct timeval tv;
42
43 gettimeofday(&tv, NULL);
44 srandom(tv.tv_usec);
45 result = make_message("%s/.paraslash/%08lu", home,
46 para_random(99999999));
47 free(home);
48 return result;
49 }
50
51 static int prepare_output_file(struct writer_node *wn)
52 {
53 struct file_write_args_info *conf = wn->conf;
54 char *filename;
55 int ret;
56 struct private_file_write_data *pfwd = para_calloc(sizeof(*pfwd));
57
58 if (conf->filename_given)
59 filename = conf->filename_arg;
60 else
61 filename = random_filename();
62 ret = para_open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
63 if (!conf->filename_given)
64 free(filename);
65 if (ret < 0)
66 goto out;
67 pfwd->fd = ret;
68 ret = mark_fd_blocking(pfwd->fd);
69 if (ret < 0)
70 goto out_close;
71 wn->private_data = pfwd;
72 return 1;
73 out_close:
74 close(pfwd->fd);
75 out:
76 free(pfwd);
77 return ret;
78 }
79
80 static void file_write_pre_select(struct sched *s, struct task *t)
81 {
82 struct writer_node *wn = container_of(t, struct writer_node, task);
83 struct private_file_write_data *pfwd = wn->private_data;
84 int ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
85
86 if (ret == 0)
87 return;
88 if (ret < 0 || !pfwd)
89 return sched_min_delay(s);
90 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
91 }
92
93 static void file_write_close(struct writer_node *wn)
94 {
95 struct private_file_write_data *pfwd = wn->private_data;
96
97 if (!pfwd)
98 return;
99 close(pfwd->fd);
100 free(pfwd);
101 }
102
103 static void file_write_post_select(__a_unused struct sched *s,
104 struct task *t)
105 {
106 struct writer_node *wn = container_of(t, struct writer_node, task);
107 struct private_file_write_data *pfwd = wn->private_data;
108 struct btr_node *btrn = wn->btrn;
109 int ret;
110 char *buf;
111 size_t bytes;
112
113 ret = task_get_notification(t);
114 if (ret < 0)
115 goto out;
116 ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
117 if (ret <= 0)
118 goto out;
119 if (!pfwd) {
120 ret = prepare_output_file(wn);
121 goto out;
122 }
123 if (!FD_ISSET(pfwd->fd, &s->wfds))
124 return;
125 bytes = btr_next_buffer(btrn, &buf);
126 assert(bytes > 0);
127 //PARA_INFO_LOG("writing %zu\n", bytes);
128 ret = write(pfwd->fd, buf, bytes);
129 if (ret < 0)
130 goto out;
131 btr_consume(btrn, ret);
132 out:
133 if (ret < 0)
134 btr_remove_node(&wn->btrn);
135 t->error = ret;
136 }
137
138 __malloc static void *file_write_parse_config_or_die(int argc, char **argv)
139 {
140 struct file_write_args_info *conf = para_calloc(sizeof(*conf));
141
142 /* exits on errors */
143 file_write_cmdline_parser(argc, argv, conf);
144 return conf;
145 }
146
147 static void file_write_free_config(void *conf)
148 {
149 file_write_cmdline_parser_free(conf);
150 }
151
152 /** the init function of the file writer */
153 void file_write_init(struct writer *w)
154 {
155 struct file_write_args_info dummy;
156
157 file_write_cmdline_parser_init(&dummy);
158 w->pre_select = file_write_pre_select;
159 w->post_select = file_write_post_select;
160 w->parse_config_or_die = file_write_parse_config_or_die;
161 w->free_config = file_write_free_config;
162 w->close = file_write_close;
163 w->help = (struct ggo_help) {
164 .short_help = file_write_args_info_help,
165 .detailed_help = file_write_args_info_detailed_help
166 };
167 file_write_cmdline_parser_free(&dummy);
168 }