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local _M = {
version = 0.03
}
local ffi = require "ffi"
local base = require "resty.core.base"
local C = ffi.C
local ffi_str = ffi.string
local tonumber = tonumber
local assert = assert
local errno = ffi.errno
local type = type
local new_tab = base.new_tab
local error = error
local string_format = string.format
local load_shared_lib
do
local string_gmatch = string.gmatch
local string_match = string.match
local io_open = io.open
local io_close = io.close
local cpath = package.cpath
function load_shared_lib(so_name)
local tried_paths = new_tab(32, 0)
local i = 1
for k, _ in string_gmatch(cpath, "[^;]+") do
local fpath = string_match(k, "(.*/)")
fpath = fpath .. so_name
-- Don't get me wrong, the only way to know if a file exist is
-- trying to open it.
local f = io_open(fpath)
if f ~= nil then
io_close(f)
return ffi.load(fpath)
end
tried_paths[i] = fpath
i = i + 1
end
return nil, tried_paths
end -- function
end -- do
local resty_signal, tried_paths = load_shared_lib("librestysignal.so")
if not resty_signal then
error("could not load librestysignal.so from the following paths:\n" ..
table.concat(tried_paths, "\n"), 2)
end
ffi.cdef[[
int resty_signal_signum(int num);
]]
if not pcall(function () return C.kill end) then
ffi.cdef("int kill(int32_t pid, int sig);")
end
if not pcall(function () return C.strerror end) then
ffi.cdef("char *strerror(int errnum);")
end
-- Below is just the ID numbers for each POSIX signal. We map these signal IDs
-- to system-specific signal numbers on the C land (via librestysignal.so).
local signals = {
NONE = 0,
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,
CHLD = 17,
CONT = 18,
STOP = 19,
TSTP = 20,
TTIN = 21,
TTOU = 22,
URG = 23,
XCPU = 24,
XFSZ = 25,
VTALRM = 26,
PROF = 27,
WINCH = 28,
IO = 29,
PWR = 30,
EMT = 31,
SYS = 32,
INFO = 33
}
local function signum(name)
local sig_num
if type(name) == "number" then
sig_num = name
else
local id = signals[name]
if not id then
return nil, "unknown signal name"
end
sig_num = tonumber(resty_signal.resty_signal_signum(id))
if sig_num < 0 then
error(
string_format("missing C def for signal %s = %d", name, id),
2
)
end
end
return sig_num
end
function _M.kill(pid, sig)
assert(sig)
local sig_num, err = signum(sig)
if err then
return nil, err
end
local rc = tonumber(C.kill(assert(pid), sig_num))
if rc == 0 then
return true
end
local err = ffi_str(C.strerror(errno()))
return nil, err
end
_M.signum = signum
return _M