Hallo, Peter!

*** Am Freitag 05. Juli 1996 um 20:22 schrieb Peter Fitzsimmons an Udo Van
Den Heuvel:

[signal handling, ^C]
 PF> static int handler(void)     /* Function called for ^C signal */ {
 PF>     signal(SIGINT, SIG_IGN); /* Disallow CTRL + C during handler   */
 PF>     brk_trapped++;
 PF>     signal(SIGINT,handler);
 PF>     return(0);
 PF> }


The handling of signals depends on what the compiler supports. There is
BSD-style, SysV-style and some other ways to do a signal handler.

Some automatically block signals until the handler is left and then unblock
it without an explicit call (BSD and POSIX.1), SysV requires the programmer
to re-install the signal handler somewhere in the handler (on delivery the
signal is set to SIG_DFL), and the emx internal way of handling things is
that the signal is blocked and must explicitly unblocked by doing
signal(signo, SIG_ACK).

Other compilers may vary, as might the prototype for a signal handling
function; usually is is of type void (*)(int), not int (*)(void).


Tschau...Thomas

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