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lib_signal.lua
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lib_signal.lua
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-- lib_signal.lua
module(..., package.seeall)
local ffi = require("ffi")
local C = ffi.C
-- http://www.cis.temple.edu/~giorgio/cis307/readings/signals.html
-- You may see what are the defined signals with the shell command
-- % kill -l
-- see: /System/Library/Frameworks/Kernel.framework/Versions/A/Headers/sys/signal.h
-- http://www.cis.temple.edu/~giorgio/cis307/readings/signals.html
-- You may see what are the defined signals with the shell command
-- % kill -l
-- see: /System/Library/Frameworks/Kernel.framework/Versions/A/Headers/sys/signal.h
-- Flags for sigprocmask:
SIG_BLOCK = 1 -- /* block specified signal set */
SIG_UNBLOCK = 2 -- /* unblock specified signal set */
SIG_SETMASK = 3 -- /* set specified signal set */
local signal_name = {}
SIGHUP = 1 -- /* hangup */
signal_name[1] = "SIGHUP - hangup"
SIGINT = 2 -- /* interrupt */
signal_name[2] = "SIGINT - interrupt"
SIGQUIT = 3 -- /* quit */
signal_name[3] = "SIGQUIT - quit"
SIGILL = 4 -- /* illegal instruction (not reset when caught) */
signal_name[4] = "SIGILL - illegal instruction (not reset when caught)"
SIGTRAP = 5 -- /* trace trap (not reset when caught) */
signal_name[5] = "SIGTRAP - trace trap (not reset when caught)"
SIGABRT = 6 -- /* abort() */
signal_name[6] = "SIGABRT - abort"
--#if (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE))
SIGPOLL = 7 -- /* pollable event ([XSR] generated, not supported) */
signal_name[7] = "SIGPOLL - pollable event ([XSR] generated, not supported)"
--#else -- /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
--SIGIOT SIGABRT -- /* compatibility */
--SIGEMT 7 -- /* EMT instruction */
--#endif -- /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
SIGFPE = 8 -- /* floating point exception */
signal_name[8] = "SIGFPE - floating point exception"
SIGKILL = 9 -- /* kill (cannot be caught or ignored) */
signal_name[9] = "SIGKILL - kill (cannot be caught or ignored)"
SIGBUS = 10 -- /* bus error */
signal_name[10] = "SIGBUS - bus error"
SIGSEGV = 11 -- /* segmentation violation */
signal_name[11] = "SIGSEGV - segmentation violation"
SIGSYS = 12 -- /* bad argument to system call */
signal_name[12] = "SIGSYS - bad argument to system call"
SIGPIPE = 13 -- /* write on a pipe with no one to read it */
signal_name[13] = "SIGPIPE - write on a pipe with no one to read it"
SIGALRM = 14 -- /* alarm clock */
signal_name[14] = "SIGALRM - alarm clock"
SIGTERM = 15 -- /* software termination signal from kill */
signal_name[15] = "SIGTERM - software termination signal from kill"
SIGURG = 16 -- /* urgent condition on IO channel */
signal_name[16] = "SIGURG - urgent condition on IO channel"
SIGSTOP = 17 -- /* sendable stop signal not from tty */
signal_name[17] = "SIGSTOP - sendable stop signal not from tty"
SIGTSTP = 18 -- /* stop signal from tty */
signal_name[18] = "SIGTSTP - stop signal from tty"
SIGCONT = 19 -- /* continue a stopped process */
signal_name[19] = "SIGCONT - continue a stopped process"
SIGCHLD = 20 -- /* to parent on child stop or exit */
signal_name[20] = "SIGCHLD - to parent on child stop or exit"
SIGTTIN = 21 -- /* to readers pgrp upon background tty read */
signal_name[21] = "SIGTTIN - to readers pgrp upon background tty read"
SIGTTOU = 22 -- /* like TTIN for output if (tp->t_local<OSTOP) */
signal_name[22] = "SIGTTOU - like TTIN for output if (tp->t_local<OSTOP)"
--#if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
SIGIO = 23 -- /* input/output possible signal */
signal_name[23] = "SIGIO - ut/output possible signal"
--#endif
SIGXCPU = 24 -- /* exceeded CPU time limit */
signal_name[24] = "SIGXCPU - exceeded CPU time limit"
SIGXFSZ = 25 -- /* exceeded file size limit */
signal_name[25] = "SIGXFSZ - exceeded file size limit"
SIGVTALRM = 26 -- /* virtual time alarm */
signal_name[26] = "SIGVTALRM - virtual time alarm"
SIGPROF = 27 -- /* profiling time alarm */
signal_name[27] = "SIGPROF - profiling time alarm"
--#if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
SIGWINCH = 28 -- /* window size changes */
signal_name[28] = "SIGWINCH - window size changes"
SIGINFO = 29 -- /* information request */
signal_name[29] = "SIGINFO - information request"
--#endif
SIGUSR1 = 30 -- /* user defined signal 1 */
signal_name[30] = "SIGUSR1 - user defined signal 1"
SIGUSR2 = 31 -- /* user defined signal 2 */
signal_name[31] = "SIGUSR2 - user defined signal 2"
function processId()
return C.getpid()
end
function signalName(i)
if i == 0 then return #signal_name end
return signal_name[i]
end
function signalHandlerSet(signalToWait)
-- https://github.com/chatid/fend/blob/master/signalfd.lua
-- usually signalToWait == SIGUSR1
sig = ffi.new("int[1]")
set = ffi.new("sigset_t[1]")
if C.sigemptyset(set) == -1 then cerr() end
if signalToWait == 0 then
-- wait for all signals
for sig=1,31 do
if C.sigaddset(set, sig) == -1 then cerr() end
end
else
if C.sigaddset(set, signalToWait) == -1 then cerr() end
end
local ret = C.pthread_sigmask(SIG_BLOCK, set, nil)
print("pthread_sigmask: "..ret)
return sig,set
end
function signalWait(set, sig)
if C.sigwait(set, sig) == -1 then cerr() end
end
function signalSend(prsToSignal, signal)
C.kill(prsToSignal, signal)
end