From 4c9dd1e4b95e273eacc900abb63db4b8bafaf34b Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 13 Feb 1999 19:43:21 +0000
Subject: Synchronize signals to the main select/event/timer loop.

Parse command line options.
---
 sysdep/unix/io.c   |  21 ++++++++++
 sysdep/unix/main.c | 110 ++++++++++++++++++++++++++++++++++++++++++-----------
 sysdep/unix/unix.h |   8 ++++
 3 files changed, 116 insertions(+), 23 deletions(-)

(limited to 'sysdep')

diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index bb8f8af..d8713f4 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -677,6 +677,9 @@ sk_dump_all(void)
  *	Main I/O Loop
  */
 
+volatile int async_config_flag;		/* Asynchronous reconfiguration/dump scheduled */
+volatile int async_dump_flag;
+
 void
 io_init(void)
 {
@@ -735,6 +738,24 @@ io_loop(void)
 	    }
 	}
 
+      /*
+       * Yes, this is racy. But even if the signal comes before this test
+       * and entering select(), it gets caught on the next timer tick.
+       */
+
+      if (async_config_flag)
+	{
+	  async_config();
+	  async_config_flag = 0;
+	}
+      if (async_dump_flag)
+	{
+	  async_dump();
+	  async_dump_flag = 0;
+	}
+
+      /* And finally enter select() to find active sockets */
+
       hi = select(hi+1, &rd, &wr, NULL, &timo);
       if (hi < 0)
 	{
diff --git a/sysdep/unix/main.c b/sysdep/unix/main.c
index d49b6f0..7b30653 100644
--- a/sysdep/unix/main.c
+++ b/sysdep/unix/main.c
@@ -7,6 +7,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/signal.h>
@@ -29,10 +30,10 @@
  *	Debugging
  */
 
-static void
-handle_sigusr(int sig)
+void
+async_dump(void)
 {
-  debug("SIGUSR1: Debugging dump...\n\n");
+  debug("INTERNAL STATE DUMP\n\n");
 
   sk_dump_all();
   tm_dump_all();
@@ -45,23 +46,12 @@ handle_sigusr(int sig)
   debug("\n");
 }
 
-static void
-signal_init(void)
-{
-  static struct sigaction sa;
-
-  sa.sa_handler = handle_sigusr;
-  sa.sa_flags = SA_RESTART;
-  if (sigaction(SIGUSR1, &sa, NULL) < 0)
-    die("sigaction: %m");
-  signal(SIGPIPE, SIG_IGN);
-}
-
 /*
  *	Reading the Configuration
  */
 
 static int conf_fd;
+static char *config_name = PATH_CONFIG;
 
 static int
 cf_read(byte *dest, unsigned int len)
@@ -75,27 +65,101 @@ cf_read(byte *dest, unsigned int len)
 static void
 read_config(void)
 {
-  struct config *conf = config_alloc(PATH_CONFIG);
+  struct config *conf = config_alloc(config_name);
 
-  conf_fd = open(PATH_CONFIG, O_RDONLY);
+  conf_fd = open(config_name, O_RDONLY);
   if (conf_fd < 0)
-    die("Unable to open configuration file " PATH_CONFIG ": %m");
+    die("Unable to open configuration file %s: %m", config_name);
   cf_read_hook = cf_read;
   if (!config_parse(conf))
-    die(PATH_CONFIG ", line %d: %s", conf->err_lino, conf->err_msg);
+    die("%s, line %d: %s", config_name, conf->err_lino, conf->err_msg);
   config_commit(conf);
 }
 
+void
+async_config(void)
+{
+  debug("Asynchronous reconfigurations are not supported in demo version\n");
+}
+
+/*
+ *	Signals
+ */
+
+static void
+handle_sighup(int sig)
+{
+  debug("Caught SIGHUP...\n");
+  async_config_flag = 1;
+}
+
+static void
+handle_sigusr(int sig)
+{
+  debug("Caught SIGUSR...\n");
+  async_dump_flag = 1;
+}
+
+static void
+signal_init(void)
+{
+  struct sigaction sa;
+
+  bzero(&sa, sizeof(sa));
+  sa.sa_handler = handle_sigusr;
+  sa.sa_flags = SA_RESTART;
+  sigaction(SIGUSR1, &sa, NULL);
+  sa.sa_handler = handle_sighup;
+  sa.sa_flags = SA_RESTART;
+  sigaction(SIGHUP, &sa, NULL);
+  signal(SIGPIPE, SIG_IGN);
+}
+
+/*
+ *	Parsing of command-line arguments
+ */
+
+static char *opt_list = "c:d:";
+
+static void
+usage(void)
+{
+  fprintf(stderr, "Usage: bird [-c <config-file>] [-d <debug-file>]\n");
+  exit(1);
+}
+
+static void
+parse_args(int argc, char **argv)
+{
+  int c;
+
+  while ((c = getopt(argc, argv, opt_list)) >= 0)
+    switch (c)
+      {
+      case 'c':
+	config_name = optarg;
+	break;
+      case 'd':
+	log_init_debug(optarg);
+	break;
+      default:
+	usage();
+      }
+  if (optind < argc)
+    usage();
+}
+
 /*
  *	Hic Est main()
  */
 
 int
-main(void)
+main(int argc, char **argv)
 {
-  log(L_INFO "Launching BIRD 0.0.0...");
-
   log_init_debug(NULL);
+  parse_args(argc, argv);
+
+  log(L_INFO "Launching BIRD 0.0.0...");
 
   debug("Initializing.\n");
   resource_init();
@@ -115,7 +179,7 @@ main(void)
   protos_start();
 
   ev_run_list(&global_event_list);
-  handle_sigusr(0);
+  async_dump();
 
   debug("Entering I/O loop.\n");
 
diff --git a/sysdep/unix/unix.h b/sysdep/unix/unix.h
index c25f3ed..a79db2e 100644
--- a/sysdep/unix/unix.h
+++ b/sysdep/unix/unix.h
@@ -9,8 +9,16 @@
 #ifndef _BIRD_UNIX_H_
 #define _BIRD_UNIX_H_
 
+/* main.c */
+
+void async_config(void);
+void async_dump(void);
+
 /* io.c */
 
+volatile int async_config_flag;
+volatile int async_dump_flag;
+
 void io_init(void);
 void io_loop(void);
 void fill_in_sockaddr(struct sockaddr_in *sa, ip_addr a, unsigned port);
-- 
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