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/tftpd.h

@@ -0,0 +1,54 @@
+/* $Id$ */
+/* ----------------------------------------------------------------------- *
+ *   
+ *   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/.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * tftpd.h
+ *
+ * Prototypes for various functions that are part of the tftpd server.
+ */
+
+#ifndef TFTPD_TFTPD_H
+#define TFTPD_TFTPD_H
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "../config.h"
+#ifdef HAVE_SYSEXITS_H
+#include <sysexits.h>
+#else
+#define EX_USAGE        64      /* command line usage error */
+#define EX_DATAERR      65      /* data format error */
+#define EX_NOINPUT      66      /* cannot open input */
+#define EX_NOUSER       67      /* addressee unknown */
+#define EX_NOHOST       68      /* host name unknown */
+#define EX_UNAVAILABLE  69      /* service unavailable */
+#define EX_SOFTWARE     70      /* internal software error */
+#define EX_OSERR        71      /* system error (e.g., can't fork) */
+#define EX_OSFILE       72      /* critical OS file missing */
+#define EX_CANTCREAT    73      /* can't create (user) output file */
+#define EX_IOERR        74      /* input/output error */
+#define EX_TEMPFAIL     75      /* temp failure; user is invited to retry */
+#define EX_PROTOCOL     76      /* remote error in protocol */
+#define EX_NOPERM       77      /* permission denied */
+#define EX_CONFIG       78      /* configuration error */
+#endif
+
+#ifndef HAVE_SIGSETJMP
+#define sigsetjmp(x,y)  setjmp(x)
+#define siglongjmp(x,y) longjmp(x,y)
+#define sigjmp_buf jmp_buf
+#endif
+
+void set_signal(int, void (*)(int), int);
+void *tfmalloc(size_t);
+char *tfstrdup(const char *);
+
+#endif