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module os
#include <signal.h>
// os.Signal - enumerate possible POSIX signals and
// their integer codes.
// NB: the integer codes are given here explicitly,
// to make it easier to lookup, without needing to
// consult man pages / signal.h .
pub enum Signal {
hup = 1
int = 2
quit = 3
ill = 4
trap = 5
abrt = 6
bus = 7
fpe = 8
kill = 9
usr1 = 10
segv = 11
usr2 = 12
pipe = 13
alrm = 14
term = 15
stkflt = 16
chld = 17
cont = 18
stop = 19
tstp = 20
ttin = 21
ttou = 22
urg = 23
xcpu = 24
xfsz = 25
vtalrm = 26
prof = 27
winch = 28
poll = 29
pwr = 30
sys = 31
}
type SignalHandler = fn (Signal)
fn C.signal(signal int, handlercb SignalHandler) voidptr
// signal will assign `handler` callback to be called when `signum` signal is received.
pub fn signal_opt(signum Signal, handler SignalHandler) ?SignalHandler {
C.errno = 0
prev_handler := C.signal(int(signum), handler)
if prev_handler == C.SIG_ERR {
// errno isn't correctly set on Windows, but EINVAL is this only possible value it can take anyway
return error_with_code(posix_get_error_msg(C.EINVAL), C.EINVAL)
}
return SignalHandler(prev_handler)
}
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