From c053133207468241f0c21364b70e9fea3a4f6bf3 Mon Sep 17 00:00:00 2001
From: Martin Pool <mbp@samba.org>
Date: Wed, 27 Mar 2002 05:10:44 +0000
Subject: [PATCH] If configured with --enable-maintainer-mode, then on receipt
 of a fatal signal rsync will try to open an xterm running gdb, similarly to
 Samba's "panic action" or GNOME's bug-buddy.

---
 INSTALL      |  3 +++
 NEWS         |  5 +++++
 configure.in | 11 +++++++++++
 main.c       | 39 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 58 insertions(+)

diff --git a/INSTALL b/INSTALL
index 60e82178..45f8ba69 100644
--- a/INSTALL
+++ b/INSTALL
@@ -14,6 +14,9 @@ cut-down copy of release 1.5 is included in the rsync distribution,
 and will be used it there is no popt library on your build host, or if
 the --with-included-popt option is passed to ./configure.
 
+If you configure using --enable-maintainer-mode, then rsync will try
+to pop up an xterm on DISPLAY=:0 if it crashes.  You might find this
+useful, but it should be turned off for production builds.
 
 
 HP-UX NOTES
diff --git a/NEWS b/NEWS
index 6f746e31..2675ac9f 100644
--- a/NEWS
+++ b/NEWS
@@ -9,6 +9,11 @@ rsync changes since last release
       accepts a DESTDIR variable for help in building binary packages.
       (Peter Breitenlohner, Greg Louis)
 
+    * If configured with --enable-maintainer-mode, then on receipt of
+      a fatal signal rsync will try to open an xterm running gdb,
+      similarly to Samba's "panic action" or GNOME's bug-buddy.
+      (Martin Pool)
+
 
   BUG FIXES:
 
diff --git a/configure.in b/configure.in
index cf9ab4bb..b3de501f 100644
--- a/configure.in
+++ b/configure.in
@@ -65,6 +65,17 @@ then
 fi
 
 
+# Specifically, this turns on panic_action handling.
+AC_ARG_ENABLE(maintainer-mode,
+	AC_HELP_STRING([--enable-maintainer-mode],	
+		[turn on extra debug features],
+		[], []))
+if test x"$enable_maintainer_mode" = xyes
+then
+	CFLAGS="$CFLAGS -DMAINTAINER_MODE"
+fi
+
+
 # This is needed for our included version of popt.  Kind of silly, but
 # I don't want our version too far out of sync.
 CFLAGS="$CFLAGS -DHAVE_CONFIG_H"
diff --git a/main.c b/main.c
index 039b05da..ef274c79 100644
--- a/main.c
+++ b/main.c
@@ -796,6 +796,39 @@ static RETSIGTYPE sigchld_handler(int UNUSED(val)) {
 #endif
 }
 
+
+/**
+ * This routine catches signals and tries to send them to gdb.
+ *
+ * Because it's called from inside a signal handler it ought not to
+ * use too many library routines.
+ *
+ * @todo Perhaps use "screen -X" instead/as well, to help people
+ * debugging without easy access to X.  Perhaps use an environment
+ * variable, or just call a script?
+ *
+ * @todo The /proc/ magic probably only works on Linux (and
+ * Solaris?)  Can we be more portable?
+ **/
+#ifdef MAINTAINER_MODE
+static RETSIGTYPE rsync_panic_handler(int UNUSED(whatsig))
+{
+	char cmd_buf[300];
+	int ret;
+	sprintf(cmd_buf, 
+		"xterm -display :0 -T Panic -n Panic "
+		"-e gdb /proc/%d/exe %d", 
+		getpid(), getpid());
+
+	/* Unless we failed to execute gdb, we allow the process to
+	 * continue.  I'm not sure if that's right. */
+	ret = system(cmd_buf);
+	if (ret)
+		_exit(ret);
+}
+#endif
+
+
 int main(int argc,char *argv[])
 {       
 	extern int am_root;
@@ -814,6 +847,12 @@ int main(int argc,char *argv[])
 	signal(SIGUSR1, sigusr1_handler);
 	signal(SIGUSR2, sigusr2_handler);
 	signal(SIGCHLD, sigchld_handler);
+#ifdef MAINTAINER_MODE
+	signal(SIGSEGV, rsync_panic_handler);
+	signal(SIGFPE, rsync_panic_handler);
+	signal(SIGABRT, rsync_panic_handler);
+	signal(SIGBUS, rsync_panic_handler);
+#endif /* def MAINTAINER_MODE */
 
 	starttime = time(NULL);
 	am_root = (getuid() == 0);
-- 
2.34.1