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| -rw-r--r-- | tutorial/Tutorial.md | 21 |
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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 ---------- |