03-01-2013
I'd say that you would want to trace the program. On linux, the strace and ptrace commands would be the tools of choice I'd say. I typically use strace with the '-f' flag to instruct it to follow any child processes it starts.
You'll be able to see any raw writes and reads to the serial device.
To get deeper and actually capture the exact data flow, you'd likely need to create a named pipe, connect that to a script that just dumps all data it seems and then passes it on to the serial port, then point the code you are reverse engineering at your new dummy "serial port" device.
You might also be able to do something crafty with a windows PC and two serial ports. Connect one to the linux host, the other to the STB. Then write a short program to capture all serial traffic on either port, and send it to the other - ie a packet sniffer for serial traffic.
(I say windows just because it sounds like you are more comfortable coding on that)
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LEARN ABOUT CENTOS
mountpoint
MOUNTPOINT(1) User Commands MOUNTPOINT(1)
NAME
mountpoint - see if a directory is a mountpoint
SYNOPSIS
mountpoint [-q] [-d] directory
mountpoint -x device
DESCRIPTION
mountpoint checks if the directory is mentioned in the /proc/self/mountinfo file.
OPTIONS
-h, --help
Print help and exit.
-q, --quiet
Be quiet - don't print anything.
-d, --fs-devno
Print major/minor device number of the filesystem on stdout.
-x, --devno
Print major/minor device number of the blockdevice on stdout.
EXIT STATUS
Zero if the directory is a mountpoint, non-zero if not.
AUTHOR
Karel Zak <kzak@redhat.com>
ENVIRONMENT
LIBMOUNT_DEBUG=0xffff
enables debug output.
NOTES
The util-linux mountpoint implementation was written from scratch for libmount. The original version for sysvinit suite was written by
Miquel van Smoorenburg.
SEE ALSO
mount(8)
AVAILABILITY
The mountpoint command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux June 2011 MOUNTPOINT(1)