А где?
Тут есть: https://sourceware.org/gdb/current/onlinedocs/gdb/Signals.html
А тут нет:
(gdb) help catch
Set catchpoints to catch events.
List of catch subcommands:
catch assert -- Catch failed Ada assertions
catch catch -- Catch an exception
catch exception -- Catch Ada exceptions
catch exec -- Catch calls to exec
catch fork -- Catch calls to fork
catch syscall -- Catch system calls by their names and/or numbers
catch throw -- Catch an exception
catch vfork -- Catch calls to vfork
#gdb --version
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-50.el6)