Brian Cuttler wrote:
Redhat, perhaps linux in general, does not use SIG HUP to reload its
configuration, it uses that to dump it. SIG USR2 however will reload
the configuration.
Actually, the signal used, if any at all, is a function of the
application's implementation. Some applications use the signal(2) system
call (and others) to trap certain signals and perform some function,
such as reload configuration file, or dump the state. The HUP signal is
common for older programs as once upon a time, there was no USR1, USR2
or many of the others.