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| author | Andy Zhou <azhou@nicira.com> | 2015-02-18 17:17:33 -0800 |
|---|---|---|
| committer | Andy Zhou <azhou@nicira.com> | 2015-02-19 13:57:52 -0800 |
| commit | 8da7cd8c8ff8a2915f42f72ff2be609856b0b52d (patch) | |
| tree | 07d33a76478cc2a162a314085397aa31ad75311c /tutorial/Tutorial.md | |
| parent | bcbb130f154cb017a5714ac97edcdef7b4032212 (diff) | |
| download | openvswitch-8da7cd8c8ff8a2915f42f72ff2be609856b0b52d.tar.gz | |
ovs-sandbox: Add an option to allow running ovs-vswitchd under gdb
It is some times useful to leverage the sandbox facility to experiment
and explore the internals of ovs-vswitchd. Since GDB requires console
access for user inputs, this patch launch an xterm for GDB, The main
terminal continue to run the sub-shell as before. Exiting the sub-shell
will also kill the ovs-vswitchd under GDB (but not GDB itself currently)
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Diffstat (limited to 'tutorial/Tutorial.md')
| -rw-r--r-- | tutorial/Tutorial.md | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/tutorial/Tutorial.md b/tutorial/Tutorial.md index d6a963b0f..d9e800475 100644 --- a/tutorial/Tutorial.md +++ b/tutorial/Tutorial.md @@ -104,6 +104,27 @@ The sandbox directory contains log files for the Open vSwitch dameons. You can examine them while you're running in the sandboxed environment or after you exit. +Using GDB +--------- + +GDB support is not required to go through the tutorial. It is added in case +user wants to explore the internals of OVS programs. + +GDB can already be used to debug any running process, with the usual +'gdb <program> <process-id>' command. + +'ovs-sandbox' also has a '-g' option for launching ovs-vswitchd under GDB. +This option can be handy for setting break points before ovs-vswitchd runs, +or for catching early segfaults. + +To avoid GDB mangling with the sandbox sub shell terminal, 'ovs-sandbox' +starts a new xterm to run each GDB session. For systems that do not support +X windows, GDB support is effectively disabled. + +When launching sandbox through the build tree's make file, the '-g' option +can be passed via the 'SANDBOXFLAGS' environment variable. +'make sandbox SANDBOXFLAGS=-g' will start the sandbox with ovs-vswitchd +running under GDB in its own xterm if X is available. Motivation ---------- |