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 <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "list.h"
  14 #include "sched.h"
  15 #include "ggo.h"
  16 #include "write.h"
  17 #include "string.h"
  18 #include "fd.h"
  19 #include "file_write.cmdline.h"
  20 #include "error.h"
  21
  22 /** data specific to the file writer */
  23 struct private_file_write_data {
  24         /** the file descriptor of the output file */
  25         int fd;
  26         /** non-zero if \a fd was added to the write fd set */
  27         int check_fd;
  28 };
  29
  30 static int file_write_open(struct writer_node *wn)
  31 {
  32         struct private_file_write_data *pfwd = para_calloc(
  33                 sizeof(struct private_file_write_data));
  34         struct file_write_args_info *conf = wn->conf;
  35         char *filename;
  36         if (conf->filename_given)
  37                 filename = conf->filename_arg;
  38         else {
  39                 char *tmp = para_tmpname(), *home = para_homedir();
  40                 filename = make_message("%s/.paraslash/%s", home, tmp);
  41                 free(home);
  42                 free(tmp);
  43         }
  44         wn->private_data = pfwd;
  45         pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
  46         if (!conf->filename_given)
  47                 free(filename);
  48         if (pfwd->fd >= 0)
  49                 return 1;
  50         free(pfwd);
  51         return -E_FW_OPEN;
  52 }
  53
  54 static int file_write_pre_select(struct sched *s, struct writer_node *wn)
  55 {
  56         struct private_file_write_data *pfwd = wn->private_data;
  57         struct writer_node_group *wng = wn->wng;
  58
  59         pfwd->check_fd = 0;
  60         if (pfwd->fd <= 0)
  61                 return -E_FW_NO_FILE;
  62         if (!*wng->loaded)
  63                 return 1;
  64         para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
  65         pfwd->check_fd = 1;
  66         return 1;
  67 }
  68
  69 static int file_write_post_select(struct sched *s, struct writer_node *wn)
  70 {
  71         struct private_file_write_data *pfwd = wn->private_data;
  72         struct writer_node_group *wng = wn->wng;
  73         int ret;
  74
  75         if (!pfwd->check_fd)
  76                 return 1;
  77         if (*wng->loaded <= wn->written)
  78                 return 1;
  79         if (!FD_ISSET(pfwd->fd, &s->wfds))
  80                 return 1;
  81 //      PARA_INFO_LOG("writing %zd\n", *wng->loaded);
  82         ret = write(pfwd->fd, *wng->bufp + wn->written,
  83                 *wng->loaded - wn->written);
  84         if (ret < 0)
  85                 return -E_FW_WRITE;
  86         wn->written += ret;
  87         return 1;
  88 }
  89
  90 static void file_write_close(struct writer_node *wn)
  91 {
  92         struct private_file_write_data *pfwd = wn->private_data;
  93         close(pfwd->fd);
  94         free(pfwd);
  95 }
  96
  97 __malloc static void *file_write_parse_config(const char *options)
  98 {
  99         struct file_write_args_info *conf
 100                 = para_calloc(sizeof(struct file_write_args_info));
 101         int ret = file_cmdline_parser_string(options, conf, "file_write");
 102
 103         PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
 104         if (!ret)
 105                 return conf;
 106         free(conf);
 107         return NULL;
 108 }
 109
 110 /** the init function of the file writer */
 111 void file_write_init(struct writer *w)
 112 {
 113         struct file_write_args_info dummy;
 114
 115         file_cmdline_parser_init(&dummy);
 116         w->open = file_write_open;
 117         w->pre_select = file_write_pre_select;
 118         w->post_select = file_write_post_select;
 119         w->parse_config = file_write_parse_config;
 120         w->close = file_write_close;
 121         w->shutdown = NULL; /* nothing to do */
 122         w->help = (struct ggo_help) {
 123                 .short_help = file_write_args_info_help,
 124                 .detailed_help = file_write_args_info_detailed_help
 125         };
 126 }