file_write.c

   1 /*
   2  * Copyright (C) 2006-2007 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 "para.h"
  10 #include "list.h"
  11 #include "sched.h"
  12 #include "write.h"
  13 #include "string.h"
  14 #include "fd.h"
  15 #include "file_write.cmdline.h"
  16 #include "error.h"
  17
  18 /** data specific to the file writer */
  19 struct private_file_write_data {
  20         /** the file descriptor of the output file */
  21         int fd;
  22         /** non-zero if \a fd was added to the write fd set */
  23         int check_fd;
  24 };
  25
  26 static int file_write_open(struct writer_node *wn)
  27 {
  28         struct private_file_write_data *pfwd = para_calloc(
  29                 sizeof(struct private_file_write_data));
  30         struct file_write_args_info *conf = wn->conf;
  31         char *filename;
  32         if (conf->filename_given)
  33                 filename = conf->filename_arg;
  34         else {
  35                 char *tmp = para_tmpname(), *home = para_homedir();
  36                 filename = make_message("%s/.paraslash/%s", home, tmp);
  37                 free(home);
  38                 free(tmp);
  39         }
  40         wn->private_data = pfwd;
  41         pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
  42         if (!conf->filename_given)
  43                 free(filename);
  44         if (pfwd->fd >= 0)
  45                 return 8192;
  46         free(pfwd);
  47         return -E_FW_OPEN;
  48 }
  49
  50 static int file_write_pre_select(struct sched *s, struct writer_node *wn)
  51 {
  52         struct private_file_write_data *pfwd = wn->private_data;
  53         struct writer_node_group *wng = wn->wng;
  54
  55         pfwd->check_fd = 0;
  56         if (pfwd->fd <= 0)
  57                 return -E_FW_NO_FILE;
  58         if (!*wng->loaded)
  59                 return 1;
  60         para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
  61         pfwd->check_fd = 1;
  62         return 1;
  63 }
  64
  65 static int file_write_post_select(struct sched *s, struct writer_node *wn)
  66 {
  67         struct private_file_write_data *pfwd = wn->private_data;
  68         struct writer_node_group *wng = wn->wng;
  69         int ret;
  70
  71         if (!pfwd->check_fd)
  72                 return 1;
  73         if (*wng->loaded <= wn->written)
  74                 return 1;
  75         if (!FD_ISSET(pfwd->fd, &s->wfds))
  76                 return 1;
  77 //      PARA_INFO_LOG("writing %zd\n", *wng->loaded);
  78         ret = write(pfwd->fd, wng->buf + wn->written,
  79                 *wng->loaded - wn->written);
  80         if (ret < 0)
  81                 return -E_FW_WRITE;
  82         wn->written += ret;
  83         return 1;
  84 }
  85
  86 static void file_write_close(struct writer_node *wn)
  87 {
  88         struct private_file_write_data *pfwd = wn->private_data;
  89         close(pfwd->fd);
  90         free(pfwd);
  91 }
  92
  93 __malloc static void *file_write_parse_config(const char *options)
  94 {
  95         PARA_INFO_LOG("options: %s\n", options);
  96         struct file_write_args_info *conf
  97                 = para_calloc(sizeof(struct file_write_args_info));
  98         int ret = file_cmdline_parser_string(options, conf, "file_write");
  99         PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
 100         if (!ret)
 101                 return conf;
 102         free(conf);
 103         return NULL;
 104 }
 105
 106 /** the init function of the file writer */
 107 void file_write_init(struct writer *w)
 108 {
 109         w->open = file_write_open;
 110         w->pre_select = file_write_pre_select;
 111         w->post_select = file_write_post_select;
 112         w->parse_config = file_write_parse_config;
 113         w->close = file_write_close;
 114         w->shutdown = NULL; /* nothing to do */
 115 }