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 "file_write.cmdline.h"
  28 #include "error.h"
  29
  30 /** data specific to the file writer */
  31 struct private_file_writer_data {
  32         /** the file descriptor of the output file */
  33         int fd;
  34         /** non-zero if \a fd was added to the write fd set */
  35         int check_fd;
  36 };
  37
  38 static int file_writer_open(struct writer_node *wn)
  39 {
  40         struct private_file_writer_data *pfwd = para_calloc(
  41                 sizeof(struct private_file_writer_data));
  42         struct file_write_args_info *conf = wn->conf;
  43         char *filename;
  44         if (conf->filename_given)
  45                 filename = conf->filename_arg;
  46         else {
  47                 char *tmp = para_tmpname(), *home = para_homedir();
  48                 filename = make_message("%s/.paraslash/%s", home, tmp);
  49                 free(home);
  50                 free(tmp);
  51         }
  52         wn->private_data = pfwd;
  53         pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
  54         if (!conf->filename_given)
  55                 free(filename);
  56         if (pfwd->fd >= 0)
  57                 return 8192;
  58         free(pfwd);
  59         return -E_FW_OPEN;
  60 }
  61
  62 static int file_writer_write(char *data, size_t nbytes, struct writer_node *wn)
  63 {
  64         struct private_file_writer_data *pfwd = wn->private_data;
  65         int ret = write(pfwd->fd, data, nbytes);
  66         if (ret < 0)
  67                 ret = -E_FW_WRITE;
  68         return ret;
  69 }
  70
  71 static void file_writer_pre_select(struct sched *s, struct task *t)
  72 {
  73         struct writer_node *wn = t->private_data;
  74         struct private_file_writer_data *pfwd = wn->private_data;
  75         struct writer_node_group *wng = wn->wng;
  76
  77 //      PARA_INFO_LOG("task %p check_fd: %d\n", t, pfwd->check_fd);
  78         pfwd->check_fd = 0;
  79         t->ret = -E_FW_NO_FILE;
  80         if (pfwd->fd <= 0)
  81                 return;
  82         t->ret = 0;
  83         if (!*wng->loaded)
  84                 return;
  85         t->ret = 1;
  86         para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
  87         pfwd->check_fd = 1;
  88 }
  89
  90 static void file_writer_post_select(struct sched *s, struct task *t)
  91 {
  92         struct writer_node *wn = t->private_data;
  93         struct private_file_writer_data *pfwd = wn->private_data;
  94         struct writer_node_group *wng = wn->wng;
  95
  96         t->ret = 0;
  97         if (!pfwd->check_fd)
  98                 return;
  99         if (!*wng->loaded)
 100                 return;
 101         if (!FD_ISSET(pfwd->fd, &s->wfds))
 102                 return;
 103 //      PARA_INFO_LOG("writing %zd\n", *wng->loaded);
 104         t->ret = write(pfwd->fd, wng->buf, *wng->loaded);
 105         if (t->ret < 0)
 106                 t->ret = -E_FW_WRITE;
 107 }
 108
 109 static void file_writer_close(struct writer_node *wn)
 110 {
 111         struct private_file_writer_data *pfwd = wn->private_data;
 112         close(pfwd->fd);
 113         free(pfwd);
 114 }
 115
 116 __malloc void *file_writer_parse_config(char *options)
 117 {
 118         PARA_INFO_LOG("options: %s\n", options);
 119         struct file_write_args_info *conf
 120                 = para_calloc(sizeof(struct file_write_args_info));
 121         int ret = file_cmdline_parser_string(options, conf, "file_write");
 122         PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
 123         if (!ret)
 124                 return conf;
 125         free(conf);
 126         return NULL;
 127 }
 128
 129 /** the init function of the file writer */
 130 void file_writer_init(struct writer *w)
 131 {
 132         w->open = file_writer_open;
 133         w->write = file_writer_write;
 134         w->pre_select = file_writer_pre_select;
 135         w->post_select = file_writer_post_select;
 136         w->parse_config = file_writer_parse_config;
 137         w->close = file_writer_close;
 138         w->shutdown = NULL; /* nothing to do */
 139 }