Fork before performing tcpwrappers check.

Don't rely on nonstandard bsd_signal() function, instead
 require that the platform has sigaction().  This is 2001,
 after all.  This may resolve some potential portability
 problems.

Log a message if memory allocation fails, instead of dying silently.

Clean up the main dispatch loop.

Use <sysexits.h> for exit codes, if it exists.

Reformat tftpd.c to match the other files.

tftpd/misc.c

@@ -0,0 +1,71 @@
+/* $Id$ */
+/* ----------------------------------------------------------------------- *
+ *   
+ *   Copyright 2001 H. Peter Anvin - All Rights Reserved
+ *
+ *   This program is free software available under the same license
+ *   as the "OpenBSD" operating system, distributed at
+ *   http://www.openbsd.org/.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * misc.c
+ *
+ * Minor help routines.
+ */
+
+#include <syslog.h>
+#include <signal.h>
+#include <string.h>
+#include "tftpd.h"
+
+/*
+ * Set the signal handler and flags.  Basically a user-friendly
+ * wrapper around sigaction().
+ */
+void set_signal(int signum, void (*handler)(int), int flags)
+{
+  struct sigaction sa;
+
+  memset(&sa, 0, sizeof sa);
+  sa.sa_handler = handler;
+  sigemptyset(&sa.sa_mask);
+  sa.sa_flags = flags;
+  
+  if ( sigaction(signum, &sa, NULL) ) {
+    syslog(LOG_ERR, "sigaction: %m");
+    exit(EX_OSERR);
+  }
+}
+
+/*
+ * malloc() that syslogs an error message and bails if it fails.
+ */
+void *tfmalloc(size_t size)
+{
+  void *p = malloc(size);
+
+  if ( !p ) {
+    syslog(LOG_ERR, "malloc: %m");
+    exit(EX_OSERR);
+  }
+
+  return p;
+}
+
+/*
+ * strdup() that does the equivalent
+ */
+char *tfstrdup(const char *str)
+{
+  char *p = strdup(str);
+
+  if ( !p ) {
+    syslog(LOG_ERR, "strdup: %m");
+    exit(EX_OSERR);
+  }
+
+  return p;
+}
+