recv_common.c

   1 /*
   2  * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file recv_common.c common functions of para_recv and para_audiod */
   8
   9 #include <regex.h>
  10 #include <stdbool.h>
  11
  12 #include "para.h"
  13 #include "list.h"
  14 #include "sched.h"
  15 #include "ggo.h"
  16 #include "recv.h"
  17 #include "string.h"
  18 #include "buffer_tree.h"
  19
  20 DEFINE_RECEIVER_ARRAY;
  21
  22 /**
  23  * Call the init function of each paraslash receiver.
  24  */
  25 void recv_init(void)
  26 {
  27         int i;
  28
  29         FOR_EACH_RECEIVER(i)
  30                 receivers[i].init(&receivers[i]);
  31 }
  32
  33 static void *parse_receiver_args(int receiver_num, char *options)
  34 {
  35         struct receiver *r = &receivers[receiver_num];
  36         char **argv;
  37         int argc, i;
  38         void *conf;
  39
  40
  41         PARA_DEBUG_LOG("%s, options: %s\n", r->name,
  42                 options? options : "(none)");
  43         if (options) {
  44                 PARA_DEBUG_LOG("options: %s\n", options);
  45                 argc = create_argv(options, " \t", &argv);
  46                 if (argc < 0)
  47                         return NULL;
  48                 for (i = argc - 1; i >= 0; i--)
  49                         argv[i + 1] = argv[i];
  50                 argc++;
  51         } else {
  52                 argc = 1;
  53                 argv = para_malloc(2 * sizeof(char*));
  54                 argv[1] = NULL;
  55         }
  56         argv[0] = make_message("%s_recv", r->name);
  57         conf = r->parse_config(argc, argv);
  58         for (i = 0; i < argc; i++)
  59                 free(argv[i]);
  60         free(argv);
  61         return conf;
  62 }
  63
  64 /**
  65  * check if given string is a valid command line for any receiver
  66  *
  67  * \param \ra string of the form receiver_name:options
  68  * \param receiver_num contains the number of the receiver upon success
  69  *
  70  * This function checks whether \a ra starts with the name of a supported
  71  * paraslash receiver, optinally followed by a colon and any options for that
  72  * receiver. If a valid receiver name was found and further are present, the
  73  * remaining part of \a ra is passed to that receiver's config parser.
  74  *
  75  * \return On success, a pointer to the gengetopt args info struct is returned
  76  * and \a receiver_num contains the number of the receiver. Otherwise this function
  77  * returns \p NULL.
  78  */
  79 void *check_receiver_arg(char *ra, int *receiver_num)
  80 {
  81         int j;
  82
  83         PARA_DEBUG_LOG("checking %s\n", ra);
  84         for (j = 0; receivers[j].name; j++) {
  85                 const char *name = receivers[j].name;
  86                 size_t len = strlen(name);
  87                 char c;
  88                 if (strlen(ra) < len)
  89                         continue;
  90                 if (strncmp(name, ra, len))
  91                         continue;
  92                 c = ra[len];
  93                 if (c && c != ' ')
  94                         continue;
  95                 if (c && !receivers[j].parse_config)
  96                         return NULL;
  97                 *receiver_num = j;
  98                 return parse_receiver_args(j, c? ra + len + 1: NULL);
  99         }
 100         PARA_ERROR_LOG("receiver not found\n");
 101         return NULL;
 102 }
 103
 104 /**
 105  * Print out the help texts to all receivers.
 106  *
 107  * \param detailed Whether the detailed help should be printed.
 108  */
 109 void print_receiver_helps(int detailed)
 110 {
 111         int i;
 112
 113         printf_or_die("\nAvailable receivers: \n\t");
 114         FOR_EACH_RECEIVER(i)
 115                 printf_or_die("%s%s", i? " " : "", receivers[i].name);
 116         printf_or_die("\n\n");
 117         FOR_EACH_RECEIVER(i) {
 118                 struct receiver *r = receivers + i;
 119                 if (!r->help.short_help)
 120                         continue;
 121                 printf_or_die("Options for %s:\n", r->name);
 122                 ggo_print_help(&r->help, detailed);
 123         }
 124 }
 125
 126 /**
 127  * Simple pre-select hook, used by all receivers.
 128  *
 129  * \param s Scheduler info.
 130  * \param t Determines the receiver node.
 131  *
 132  * This requests a minimal delay from the scheduler if the status of the buffer
 133  * tree node indicates an error/eof condition. No file descriptors are added to
 134  * the fd sets of \a s.
 135  *
 136  * \return Standard.
 137  */
 138 int generic_recv_pre_select(struct sched *s, struct task *t)
 139 {
 140         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 141         int ret = btr_node_status(rn->btrn, 0, BTR_NT_ROOT);
 142
 143         t->error = 0;
 144         if (ret < 0)
 145                 sched_min_delay(s);
 146         return ret;
 147 }