ken@astro-vm:~$ gdb --eval-command="set follow-fork-mode child" --args indiserver -v indi_tcfs_focus
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Reading symbols from indiserver...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/indiserver -v indi_tcfs_focus
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
2017-10-31T10:32:49: startup: /usr/bin/indiserver -v indi_tcfs_focus 
2017-10-31T10:32:49: Driver indi_tcfs_focus: pid=3544 rfd=3 wfd=6 efd=7
2017-10-31T10:32:49: listening to port 7624 on fd 4
[New process 3544]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
process 3544 is executing new program: /usr/bin/indi_tcfs_focus
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Thread 2.1 "indi_tcfs_focus" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7fb0740 (LWP 3544)]
0x000055555555872b in TCFS::ISNewSwitch(char const*, char const*, ISState*, char**, int) ()
(gdb)