gimpsignal

gimpsignal — Portable signal handling.

Synopsis




void        (*GimpSignalHandlerFunc)        (gint signum);
GimpSignalHandlerFunc gimp_signal_private   (gint signum,
                                             GimpSignalHandlerFunc handler,
                                             gint flags);

Description

Portable signal handling.

Details

GimpSignalHandlerFunc ()

void        (*GimpSignalHandlerFunc)        (gint signum);

A prototype for signal handler functions. Note that each function which takes or returns a variable of this type also accepts or may return special values defined by your system's signal.h header file (like SIG_DFL or SIG_IGN).

signum : The number of the signal. Useful if different signals are handled by a single handler.

gimp_signal_private ()

GimpSignalHandlerFunc gimp_signal_private   (gint signum,
                                             GimpSignalHandlerFunc handler,
                                             gint flags);

This function furnishes a workalike for signal(2) but which internally invokes sigaction(2) after certain sa_flags are set; these primarily to ensure restarting of interrupted system calls. See sigaction(2) It is a aid to transition and not new development: that effort should employ sigaction directly. [gosgood 18.04.2000]

Cause handler to be run when signum is delivered. We use sigaction(2) rather than signal(2) so that we can control the signal handler's environment completely via flags: some signal(2) implementations differ in their sematics, so we need to nail down exactly what we want. [austin 06.04.2000]

`signum` :	Selects signal to be handled see man 5 signal (or man 7 signal)
`handler` :	Handler that maps to signum. Invoked by O/S. Handler gets signal that caused invocation. Corresponds to the `sa_handler` field of the `sigaction` struct.
`flags` :	Preferences. OR'ed SA_<xxx>. See man sigaction. Corresponds to the `sa_flags` field of the `sigaction` struct.
Returns :	A reference to the signal handling function which was active before the call to `gimp_signal_private()`.