file_write.c

   1 /*
   2  * Copyright (C) 2006-2008 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 "write.h"
  16 #include "string.h"
  17 #include "fd.h"
  18 #include "file_write.cmdline.h"
  19 #include "error.h"
  20
  21 /** data specific to the file writer */
  22 struct private_file_write_data {
  23         /** the file descriptor of the output file */
  24         int fd;
  25         /** non-zero if \a fd was added to the write fd set */
  26         int check_fd;
  27 };
  28
  29 static int file_write_open(struct writer_node *wn)
  30 {
  31         struct private_file_write_data *pfwd = para_calloc(
  32                 sizeof(struct private_file_write_data));
  33         struct file_write_args_info *conf = wn->conf;
  34         char *filename;
  35         if (conf->filename_given)
  36                 filename = conf->filename_arg;
  37         else {
  38                 char *tmp = para_tmpname(), *home = para_homedir();
  39                 filename = make_message("%s/.paraslash/%s", home, tmp);
  40                 free(home);
  41                 free(tmp);
  42         }
  43         wn->private_data = pfwd;
  44         pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
  45         if (!conf->filename_given)
  46                 free(filename);
  47         if (pfwd->fd >= 0)
  48                 return 8192;
  49         free(pfwd);
  50         return -E_FW_OPEN;
  51 }
  52
  53 static int file_write_pre_select(struct sched *s, struct writer_node *wn)
  54 {
  55         struct private_file_write_data *pfwd = wn->private_data;
  56         struct writer_node_group *wng = wn->wng;
  57
  58         pfwd->check_fd = 0;
  59         if (pfwd->fd <= 0)
  60                 return -E_FW_NO_FILE;
  61         if (!*wng->loaded)
  62                 return 1;
  63         para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
  64         pfwd->check_fd = 1;
  65         return 1;
  66 }
  67
  68 static int file_write_post_select(struct sched *s, struct writer_node *wn)
  69 {
  70         struct private_file_write_data *pfwd = wn->private_data;
  71         struct writer_node_group *wng = wn->wng;
  72         int ret;
  73
  74         if (!pfwd->check_fd)
  75                 return 1;
  76         if (*wng->loaded <= wn->written)
  77                 return 1;
  78         if (!FD_ISSET(pfwd->fd, &s->wfds))
  79                 return 1;
  80 //      PARA_INFO_LOG("writing %zd\n", *wng->loaded);
  81         ret = write(pfwd->fd, wng->buf + wn->written,
  82                 *wng->loaded - wn->written);
  83         if (ret < 0)
  84                 return -E_FW_WRITE;
  85         wn->written += ret;
  86         return 1;
  87 }
  88
  89 static void file_write_close(struct writer_node *wn)
  90 {
  91         struct private_file_write_data *pfwd = wn->private_data;
  92         close(pfwd->fd);
  93         free(pfwd);
  94 }
  95
  96 __malloc static void *file_write_parse_config(const char *options)
  97 {
  98         PARA_INFO_LOG("options: %s\n", options);
  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         PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
 103         if (!ret)
 104                 return conf;
 105         free(conf);
 106         return NULL;
 107 }
 108
 109 /** the init function of the file writer */
 110 void file_write_init(struct writer *w)
 111 {
 112         w->open = file_write_open;
 113         w->pre_select = file_write_pre_select;
 114         w->post_select = file_write_post_select;
 115         w->parse_config = file_write_parse_config;
 116         w->close = file_write_close;
 117         w->shutdown = NULL; /* nothing to do */
 118 }