2 * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file file_write.c simple output plugin for testing purposes */
10 #include <sys/types.h>
19 #include "buffer_tree.h"
21 #include "write_common.h"
24 #include "file_write.cmdline.h"
27 /** Data specific to the file writer. */
28 struct private_file_write_data {
29 /** The file descriptor of the output file. */
34 * Get a random filename.
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.
40 __must_check __malloc static char *random_filename(void)
42 char *result, *home = para_homedir();
45 gettimeofday(&tv, NULL);
47 result = make_message("%s/.paraslash/%08lu", home,
48 para_random(99999999));
53 static void file_write_open(struct writer_node *wn)
55 struct private_file_write_data *pfwd = para_calloc(sizeof(*pfwd));
57 wn->private_data = pfwd;
61 static int prepare_output_file(struct writer_node *wn)
63 struct file_write_args_info *conf = wn->conf;
64 struct private_file_write_data *pfwd = wn->private_data;
68 if (conf->filename_given)
69 filename = conf->filename_arg;
71 filename = random_filename();
72 ret = para_open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
73 if (!conf->filename_given)
78 ret = mark_fd_blocking(pfwd->fd);
87 static void file_write_pre_select(struct sched *s, struct task *t)
89 struct writer_node *wn = container_of(t, struct writer_node, task);
90 struct private_file_write_data *pfwd = wn->private_data;
94 ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
95 if (ret > 0 && pfwd->fd >= 0)
96 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
97 else if (ret != 0) /* error or bos and fd not yet open */
101 static void file_write_close(struct writer_node *wn)
103 struct private_file_write_data *pfwd = wn->private_data;
110 static void file_write_post_select(__a_unused struct sched *s,
113 struct writer_node *wn = container_of(t, struct writer_node, task);
114 struct private_file_write_data *pfwd = wn->private_data;
115 struct btr_node *btrn = wn->btrn;
121 ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
125 ret = prepare_output_file(wn);
129 if (!FD_ISSET(pfwd->fd, &s->wfds))
131 bytes = btr_next_buffer(btrn, &buf);
133 //PARA_INFO_LOG("writing %zu\n", bytes);
134 ret = write(pfwd->fd, buf, bytes);
137 btr_consume(btrn, ret);
140 btr_remove_node(btrn);
144 __malloc static void *file_write_parse_config_or_die(const char *options)
146 struct file_write_args_info *conf = para_calloc(sizeof(*conf));
148 /* exits on errors */
149 file_cmdline_parser_string(options, conf, "file_write");
153 static void file_write_free_config(void *conf)
155 file_cmdline_parser_free(conf);
158 /** the init function of the file writer */
159 void file_write_init(struct writer *w)
161 struct file_write_args_info dummy;
163 file_cmdline_parser_init(&dummy);
164 w->open = file_write_open;
165 w->pre_select = file_write_pre_select;
166 w->post_select = file_write_post_select;
167 w->parse_config_or_die = file_write_parse_config_or_die;
168 w->free_config = file_write_free_config;
169 w->close = file_write_close;
170 w->shutdown = NULL; /* nothing to do */
171 w->help = (struct ggo_help) {
172 .short_help = file_write_args_info_help,
173 .detailed_help = file_write_args_info_detailed_help
175 file_cmdline_parser_free(&dummy);