recv_common.c

   1 /*
   2  * Copyright (C) 2006-2013 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
  11 #include "para.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "ggo.h"
  15 #include "buffer_tree.h"
  16 #include "recv.h"
  17 #include "string.h"
  18
  19 /**
  20  * Call the init function of each paraslash receiver.
  21  */
  22 void recv_init(void)
  23 {
  24         int i;
  25
  26         FOR_EACH_RECEIVER(i)
  27                 receivers[i].init(&receivers[i]);
  28 }
  29
  30 static void *parse_receiver_args(int receiver_num, char *options)
  31 {
  32         struct receiver *r = &receivers[receiver_num];
  33         char **argv;
  34         int argc;
  35         void *conf;
  36
  37         if (options) {
  38                 argc = create_shifted_argv(options, " \t", &argv);
  39                 if (argc < 0)
  40                         return NULL;
  41         } else {
  42                 argc = 1;
  43                 argv = para_malloc(2 * sizeof(char*));
  44                 argv[1] = NULL;
  45         }
  46         argv[0] = make_message("%s_recv", r->name);
  47         conf = r->parse_config(argc, argv);
  48         free_argv(argv);
  49         return conf;
  50 }
  51
  52 /**
  53  * check if given string is a valid command line for any receiver
  54  *
  55  * \param \ra string of the form receiver_name:options
  56  * \param receiver_num contains the number of the receiver upon success
  57  *
  58  * This function checks whether \a ra starts with the name of a supported
  59  * paraslash receiver, optinally followed by a colon and any options for that
  60  * receiver. If a valid receiver name was found and further are present, the
  61  * remaining part of \a ra is passed to that receiver's config parser.
  62  *
  63  * \return On success, a pointer to the gengetopt args info struct is returned
  64  * and \a receiver_num contains the number of the receiver. Otherwise this function
  65  * returns \p NULL.
  66  */
  67 void *check_receiver_arg(char *ra, int *receiver_num)
  68 {
  69         int j;
  70
  71         PARA_DEBUG_LOG("checking %s\n", ra);
  72         for (j = 0; receivers[j].name; j++) {
  73                 const char *name = receivers[j].name;
  74                 size_t len = strlen(name);
  75                 char c;
  76                 if (strlen(ra) < len)
  77                         continue;
  78                 if (strncmp(name, ra, len))
  79                         continue;
  80                 c = ra[len];
  81                 if (c && c != ' ')
  82                         continue;
  83                 if (c && !receivers[j].parse_config)
  84                         return NULL;
  85                 *receiver_num = j;
  86                 return parse_receiver_args(j, c? ra + len + 1: NULL);
  87         }
  88         PARA_ERROR_LOG("receiver not found\n");
  89         return NULL;
  90 }
  91
  92 /**
  93  * Print out the help texts to all receivers.
  94  *
  95  * \param flags Passed to \ref ggo_print_help().
  96  */
  97 void print_receiver_helps(unsigned flags)
  98 {
  99         int i;
 100
 101         printf_or_die("\nAvailable receivers: ");
 102         FOR_EACH_RECEIVER(i)
 103                 printf_or_die("%s%s", i? " " : "", receivers[i].name);
 104         printf_or_die("\n");
 105         FOR_EACH_RECEIVER(i) {
 106                 struct receiver *r = receivers + i;
 107                 if (!r->help.short_help)
 108                         continue;
 109                 printf_or_die("\n%s: %s", r->name,
 110                         r->help.purpose);
 111                 ggo_print_help(&r->help, flags);
 112         }
 113 }
 114
 115 /**
 116  * Simple pre-select hook, used by all receivers.
 117  *
 118  * \param s Scheduler info.
 119  * \param t Determines the receiver node.
 120  *
 121  * This requests a minimal delay from the scheduler if the status of the buffer
 122  * tree node indicates an error/eof condition. No file descriptors are added to
 123  * the fd sets of \a s.
 124  *
 125  * \return The status of the btr node of the receiver node, i.e. the return
 126  * value of the underlying call to \ref btr_node_status().
 127  */
 128 int generic_recv_pre_select(struct sched *s, struct task *t)
 129 {
 130         struct receiver_node *rn = container_of(t, struct receiver_node, task);
 131         int ret = btr_node_status(rn->btrn, 0, BTR_NT_ROOT);
 132
 133         t->error = 0;
 134         if (ret < 0)
 135                 sched_min_delay(s);
 136         return ret;
 137 }