Add tcpdump and libpcap.

- Update the file builder generator to handle generator specific cflags and
  includes. The tcpdump and libpcap have localised headers and need specific
  headers paths to see them. There are also module specific flags and these
  need to be passed to the lex and yacc generators.

- Add the tcpdump support.

1 files changed, 95 insertions, 0 deletions

diff --git a/freebsd/contrib/tcpdump/setsignal.c b/freebsd/contrib/tcpdump/setsignal.c
new file mode 100644
index 00000000..7a9d08e0
--- /dev/null
+++ b/freebsd/contrib/tcpdump/setsignal.c
@@ -0,0 +1,95 @@
+#include <machine/rtems-bsd-user-space.h>
+
+/*
+ * Copyright (c) 1997
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/setsignal.c,v 1.11 2003-11-16 09:36:42 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <signal.h>
+#ifdef HAVE_SIGACTION
+#include <string.h>
+#endif
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+#include "setsignal.h"
+
+/*
+ * An OS-independent signal() with, whenever possible, partial BSD
+ * semantics, i.e. the signal handler is restored following service
+ * of the signal, but system calls are *not* restarted, so that if
+ * "pcap_breakloop()" is called in a signal handler in a live capture,
+ * the read/recvfrom/whatever in the live capture doesn't get restarted,
+ * it returns -1 and sets "errno" to EINTR, so we can break out of the
+ * live capture loop.
+ *
+ * We use "sigaction()" if available.  We don't specify that the signal
+ * should restart system calls, so that should always do what we want.
+ *
+ * Otherwise, if "sigset()" is available, it probably has BSD semantics
+ * while "signal()" has traditional semantics, so we use "sigset()"; it
+ * might cause system calls to be restarted for the signal, however.
+ * I don't know whether, in any systems where it did cause system calls to
+ * be restarted, there was a way to ask it not to do so; there may no
+ * longer be any interesting systems without "sigaction()", however,
+ * and, if there are, they might have "sigvec()" with SV_INTERRUPT
+ * (which I think first appeared in 4.3BSD).
+ *
+ * Otherwise, we use "signal()" - which means we might get traditional
+ * semantics, wherein system calls don't get restarted *but* the
+ * signal handler is reset to SIG_DFL and the signal is not blocked,
+ * so that a subsequent signal would kill the process immediately.
+ *
+ * Did I mention that signals suck?  At least in POSIX-compliant systems
+ * they suck far less, as those systems have "sigaction()".
+ */
+RETSIGTYPE
+(*setsignal (int sig, RETSIGTYPE (*func)(int)))(int)
+{
+#ifdef HAVE_SIGACTION
+	struct sigaction old, new;
+
+	memset(&new, 0, sizeof(new));
+	new.sa_handler = func;
+	if (sigaction(sig, &new, &old) < 0)
+		return (SIG_ERR);
+	return (old.sa_handler);
+
+#else
+#ifdef HAVE_SIGSET
+	return (sigset(sig, func));
+#else
+	return (signal(sig, func));
+#endif
+#endif
+}
+