.\" $PMDB: pmdb.1,v 1.2 2002/02/20 15:16:27 art Exp $ .\" .\" Copyright (c) 2002 Artur Grabowski .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, .\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY .\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL .\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, .\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, .\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; .\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, .\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF .\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd Feb 20, 2002 .Dt PMDB 1 .Os .Sh NAME .Nm pmdb .Nd debugger. .Sh SYNOPSIS .Nm pmdb .Ar program Op Ar ... .Sh DESCRIPTION The .Nm utility can be used to see what is happening inside a running process or to catch program crashes and examine the state at the time of the crash. The only way to start .Nm at this moment is to specify the name of the prgram to be debugged and all its arguments on the command line. The program is controlled from a command line which usually gives the prompt "pmdb>". .Sh PROCESS STATES A loaded program can be in one of three possible states: .Bl -tag -width RUNNING .It LOADED This is the initial state. The program is not running, it can't be examined (because it doesn't have any state). The only thing that can be done to the process is to start it with the .Ic run command. .It RUNNING When a process is .Ic RUNNING , the only way to affect it is through signals sent to it. Unless a signal is ignored with the .Ic signal ignore command, it will be catched by pmdb and the process will go into the .Ic STOPPED state. .It STOPPED A stopped process can be examined, changed and restarted with the .Ic continue command. .El .Sh COMMANDS .Bl -tag -width continue .It regs Show the contents of the processor registers at the moment the process was .Ic STOPPED . .It trace Show the function call trace of the currently .Ic STOPPED process. .It run Start running a .Ic LOADED process. .It continue Continue a .Ic STOPPED process. .It kill Unconditionally kills the debugged process and puts it in the .Ic LOADED state. .It signal Ar ignore|stop Ar signum|signame Sets the signal state for the specified signal to either ignore it and pass it to the process or to stop the process. .It sigstate Shows which signals are currently ignored. .It help Shows a short help. .It quit Kills the process (if necessary) and exits .Nm . .It exit Alias for .Ic quit . .El .Sh HISTORY The .Nm debugger was written because the author believed that .Xr gdb 1 was too to bloated and hairy to run on OpenBSD/sparc64.