dsignal.h File Reference

Contains the API for serializing signals to a pipe for usage with select() or poll(). More...

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Functions
int	daemon_signal_init (int s,...)
	Installs signal handlers for the specified signals.
int	daemon_signal_install (int s)
	Install a signal handler for the specified signal.
void	daemon_signal_done (void)
	Free resources of signal handling, should be called before daemon exit.
int	daemon_signal_next (void)
	Return the next signal recieved.
int	daemon_signal_fd (void)
	Return the file descriptor the daemon should select() on for reading.

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Detailed Description

Contains the API for serializing signals to a pipe for usage with select() or poll().

You should register all signals you wish to handle with select() in your main loop with daemon_signal_init() or daemon_signal_install(). After that you should sleep on the file descriptor returned by daemon_signal_fd() and get the next signal recieved with daemon_signal_next(). You should call daemon_signal_done() before exiting.

Definition in file dsignal.h.

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Function Documentation

void daemon_signal_done

(

void

)

Free resources of signal handling, should be called before daemon exit.

Examples:

testd.c.

int daemon_signal_fd

(

void

)

Return the file descriptor the daemon should select() on for reading.

Whenever the descriptor is ready you should call daemon_signal_next() to get the next signal queued.

Returns:

The file descriptor or negative on failure

Examples:

testd.c.

int daemon_signal_init	(	int	s,
			...
	)

Installs signal handlers for the specified signals.

Parameters:

s,...

The signals to install handlers for. The list should be terminated by 0

Returns:

zero on success, nonzero on failure

Examples:

testd.c.

int daemon_signal_install

(

int

s

)

Install a signal handler for the specified signal.

Parameters:

s

The signalto install handler for

Returns:

zero onsuccess,nonzero on failure

int daemon_signal_next

(

void

)

Return the next signal recieved.

This function will not block. Instead it returns 0 if no signal is queued.

Returns:

The next queued signal if one is queued, zero if none is queued, negative on failure.

Examples:

testd.c.