QNX Neutrino Programmer's Guide [6.5.0 SP1] - QNX Software ...

© 2012, QNX Software Systems Limited A simple debug session
telnet stream tcp nowait root /bin/telnetd telnetd
finger stream tcp nowait root /bin fingerd
pdebug stream tcp nowait root /bin/pdebug pdebug -
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A simple debug session
Configure the target
In this example, we’ll be debugging our “Hello, world!” program via a TCP/IP link.
We go through the following steps:
• configuring the target
• compiling for debugging
• starting the debug session
• getting help
Compile for debugging
Let’s assume an x86 target using a basic TCP/IP configuration. The following lines
(from the sample boot file at the end of this chapter) show what’s needed to host the
sample session:
io-pkt-v4 -dne2000 -ptcpip if=ndi0:10.0.1.172 &
devc-pty &
[+session] pdebug 8000 &
The above specifies that the host IP address is 10.0.1.172 (or 10.428 for short). The
pdebug program is configured to use port 8000.
We’ll be using the x86 compiler. Note the -g option, which enables debugging
information to be included:
$ qcc -V gcc_ntox86 -g -o hello hello.c
Start the debug session
For this simple example, the sources can be found in our working directory. The gdb
debugger provides its own shell; by default its prompt is (gdb). The following
commands would be used to start the session. To reduce document clutter, we’ll run
the debugger in quiet mode:
# Working from the source directory:
(61) con1 /home/allan/src >ntox86-gdb -quiet
# Specifying the target IP address and the port
# used by pdebug:
(gdb) target qnx 10.428:8000
Remote debugging using 10.428:8000
0x0 in ?? ()
June 14, 2012 Chapter 1 • Compiling and Debugging 29