Commit 5d1564df authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

error checking in signals.c + Add signals to documentation

parent 78a066bc

man/feh.1

+11 −0
Original line number Diff line number Diff line
@@ -677,6 +677,17 @@ the mouse. The zoom will always happen so that the pixel on which you entered 
the zoom mode remains stationary.  So, to enlarge a specific part of an image,

click the zoom button on that part.

.

.Sh SIGNALS

In slideshow mode,

.Nm

handles the following signals:

.Bl -tag -width indent

.It SIGUSR1

Switch to next image

.It SIGUSR2

Switch to previous image

.El

.

.Sh USAGE EXAMPLES

Here are some examples of useful option combinations

.Bl -tag -width indent

src/signals.c

+16 −5
Original line number Diff line number Diff line
@@ -34,15 +34,26 @@ void setup_signal_handlers() 
	sigset_t feh_ss;

	D_ENTER(4);



	sigemptyset(&feh_ss);

	sigaddset(&feh_ss, SIGUSR1);

	sigaddset(&feh_ss, SIGUSR2);

	if (

		(sigemptyset(&feh_ss) == -1) ||

		(sigaddset(&feh_ss, SIGUSR1) == -1) ||

		(sigaddset(&feh_ss, SIGUSR2) == -1))

	{

		weprintf("Failed to set up signal mask, SIGUSR1/2 won't work");

		D_RETURN_(4);

	}



	feh_sh.sa_handler = feh_handle_signal;

	feh_sh.sa_mask = feh_ss;



	sigaction(SIGUSR1, &feh_sh, NULL);

	sigaction(SIGUSR2, &feh_sh, NULL);

	if (

		(sigaction(SIGUSR1, &feh_sh, NULL) == -1) ||

		(sigaction(SIGUSR2, &feh_sh, NULL) == -1))

	{

		weprintf("Failed to set up signal handler, SIGUSR1/2 won't work");

		D_RETURN_(4);

	}



	D_RETURN_(4);

}