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Signal handling is complicated by threads. In order to enforce the proper signal handling across threaded and non-threaded applications, we provide a simple interface to signal handling which hides the appropriate details. It is strongly recommended that you use this interface to install signal handlers.
void Gal_InitializeSignals()
This function is called by GalSS_CmdlineInitializeServer
and GalSS_InitializeServerToplevel.
In the non-threaded environment, it does nothing; if threads are enabled,
it sets up a separate thread for signal handling and enables a few default
handlers.
int Gal_SignalsInitialized()
Returns 1 if signals have been initialized.
In the non-threaded case, always returns 1.
void Gal_AddSignalHandler(int
sig,
void (handler)(int ))
This function is like calling signal(),
except it handles signals appropriately in threaded contexts. It supports
the System V interpretation of signal(), whereby the signal handler is
cleared after the signal is caught. If you want the signal to be caught
again, you must call Gal_AddSignalHandler() inside your signal handler.
This function will do the right thing inside _GalSS_init_server
and _GalSS_InitializeDefaults.
(although in the threaded case, no signals can be counted on to be handled
appropriately until immediately before _GalSS_init_server is called).
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