/
syscalls.lua
798 lines (738 loc) · 29.8 KB
/
syscalls.lua
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
-- choose correct syscalls for OS, plus shared calls
-- note that where functions are identical if present but may be missing they can also go here
-- note that OS specific calls are loaded at the end so they may override generic calls here
local require, error, assert, tonumber, tostring,
setmetatable, pairs, ipairs, unpack, rawget, rawset,
pcall, type, table, string =
require, error, assert, tonumber, tostring,
setmetatable, pairs, ipairs, unpack, rawget, rawset,
pcall, type, table, string
local abi = require "syscall.abi"
local ffi = require "ffi"
local bit = require "syscall.bit"
local h = require "syscall.helpers"
local err64 = h.err64
local errpointer = h.errpointer
local getfd, istype, mktype, reviter = h.getfd, h.istype, h.mktype, h.reviter
local function init(C, c, types)
-- this could be an arguments, fcntl syscall is a function of this
local fcntl = require("syscall." .. abi.os .. ".fcntl").init(types)
local errno = ffi.errno
local t, pt, s = types.t, types.pt, types.s
local S = {}
local function getdev(dev)
if type(dev) == "table" then return t.device(dev).dev end
if ffi.istype(t.device, dev) then dev = dev.dev end
return dev
end
-- return helpers.
-- 64 bit return helpers. Only use for lseek in fact; we use tonumber but remove if you need files over 56 bits long
-- TODO only luaffi needs the cast as wont compare to number; hopefully fixed in future with 5.3 or a later luaffi.
local function ret64(ret, err)
if ret == err64 then return nil, t.error(err or errno()) end
return tonumber(ret)
end
local function retnum(ret, err) -- return Lua number where double precision ok, eg file ops etc
ret = tonumber(ret)
if ret == -1 then return nil, t.error(err or errno()) end
return ret
end
local function retfd(ret, err)
if ret == -1 then return nil, t.error(err or errno()) end
return t.fd(ret)
end
-- used for no return value, return true for use of assert
local function retbool(ret, err)
if ret == -1 then return nil, t.error(err or errno()) end
return true
end
-- used for pointer returns, -1 is failure
local function retptr(ret, err)
if ret == errpointer then return nil, t.error(err or errno()) end
return ret
end
-- generic iterator; this counts down to 0 so need no closure
local function retiter(ret, err, array)
ret = tonumber(ret)
if ret == -1 then return nil, t.error(err or errno()) end
return reviter, array, ret
end
-- generic system calls
function S.open(pathname, flags, mode) return retfd(C.open(pathname, c.O[flags], c.MODE[mode])) end
function S.close(fd) return retbool(C.close(getfd(fd))) end
function S.chdir(path) return retbool(C.chdir(path)) end
function S.fchdir(fd) return retbool(C.fchdir(getfd(fd))) end
function S.mkdir(path, mode) return retbool(C.mkdir(path, c.MODE[mode])) end
function S.rmdir(path) return retbool(C.rmdir(path)) end
function S.unlink(pathname) return retbool(C.unlink(pathname)) end
function S.rename(oldpath, newpath) return retbool(C.rename(oldpath, newpath)) end
function S.chmod(path, mode) return retbool(C.chmod(path, c.MODE[mode])) end
function S.fchmod(fd, mode) return retbool(C.fchmod(getfd(fd), c.MODE[mode])) end
function S.chown(path, owner, group) return retbool(C.chown(path, owner or -1, group or -1)) end
function S.fchown(fd, owner, group) return retbool(C.fchown(getfd(fd), owner or -1, group or -1)) end
function S.lchown(path, owner, group) return retbool(C.lchown(path, owner or -1, group or -1)) end
function S.link(oldpath, newpath) return retbool(C.link(oldpath, newpath)) end
function S.symlink(oldpath, newpath) return retbool(C.symlink(oldpath, newpath)) end
function S.chroot(path) return retbool(C.chroot(path)) end
function S.umask(mask) return C.umask(c.MODE[mask]) end
function S.sync() C.sync() end
function S.mknod(pathname, mode, dev) return retbool(C.mknod(pathname, c.S_I[mode], getdev(dev) or 0)) end
function S.flock(fd, operation) return retbool(C.flock(getfd(fd), c.LOCK[operation])) end
-- TODO read should have consistent return type but then will differ from other calls.
function S.read(fd, buf, count)
if buf then return retnum(C.read(getfd(fd), buf, count or #buf or 4096)) end -- user supplied a buffer, standard usage
count = count or 4096
buf = t.buffer(count)
local ret, err = tonumber(C.read(getfd(fd), buf, count))
if ret == -1 then return nil, t.error(err or errno()) end
return ffi.string(buf, ret) -- user gets a string back, can get length from #string
end
function S.readv(fd, iov)
iov = mktype(t.iovecs, iov)
return retnum(C.readv(getfd(fd), iov.iov, #iov))
end
function S.write(fd, buf, count) return retnum(C.write(getfd(fd), buf, count or #buf)) end
function S.writev(fd, iov)
iov = mktype(t.iovecs, iov)
return retnum(C.writev(getfd(fd), iov.iov, #iov))
end
function S.pread(fd, buf, count, offset) return retnum(C.pread(getfd(fd), buf, count, offset)) end
function S.pwrite(fd, buf, count, offset) return retnum(C.pwrite(getfd(fd), buf, count or #buf, offset)) end
if C.preadv and C.pwritev then -- these are missing in eg OSX
function S.preadv(fd, iov, offset)
iov = mktype(t.iovecs, iov)
return retnum(C.preadv(getfd(fd), iov.iov, #iov, offset))
end
function S.pwritev(fd, iov, offset)
iov = mktype(t.iovecs, iov)
return retnum(C.pwritev(getfd(fd), iov.iov, #iov, offset))
end
end
function S.access(pathname, mode) return retbool(C.access(pathname, c.OK[mode])) end
function S.lseek(fd, offset, whence)
return ret64(C.lseek(getfd(fd), offset or 0, c.SEEK[whence or c.SEEK.SET]))
end
function S.readlink(path, buffer, size)
size = size or c.PATH_MAX
buffer = buffer or t.buffer(size)
local ret, err = tonumber(C.readlink(path, buffer, size))
if ret == -1 then return nil, t.error(err or errno()) end
return ffi.string(buffer, ret)
end
function S.fsync(fd) return retbool(C.fsync(getfd(fd))) end
function S.stat(path, buf)
if not buf then buf = t.stat() end
local ret = C.stat(path, buf)
if ret == -1 then return nil, t.error() end
return buf
end
function S.lstat(path, buf)
if not buf then buf = t.stat() end
local ret, err = C.lstat(path, buf)
if ret == -1 then return nil, t.error(err or errno()) end
return buf
end
function S.fstat(fd, buf)
if not buf then buf = t.stat() end
local ret, err = C.fstat(getfd(fd), buf)
if ret == -1 then return nil, t.error(err or errno()) end
return buf
end
function S.truncate(path, length) return retbool(C.truncate(path, length)) end
function S.ftruncate(fd, length) return retbool(C.ftruncate(getfd(fd), length)) end
local function sproto(domain, protocol) -- helper function to lookup protocol type depending on domain TODO table?
protocol = protocol or 0
if domain == c.AF.NETLINK then return c.NETLINK[protocol] end
return c.IPPROTO[protocol]
end
function S.socket(domain, stype, protocol)
domain = c.AF[domain]
return retfd(C.socket(domain, c.SOCK[stype], sproto(domain, protocol)))
end
function S.socketpair(domain, stype, protocol, sv2)
domain = c.AF[domain]
sv2 = sv2 or t.int2()
local ret, err = C.socketpair(domain, c.SOCK[stype], sproto(domain, protocol), sv2)
if ret == -1 then return nil, t.error(err or errno()) end
return true, nil, t.fd(sv2[0]), t.fd(sv2[1])
end
function S.dup(oldfd) return retfd(C.dup(getfd(oldfd))) end
function S.dup2(oldfd, newfd) return retfd(C.dup2(getfd(oldfd), getfd(newfd))) end
if C.dup3 then function S.dup3(oldfd, newfd, flags) return retfd(C.dup3(getfd(oldfd), getfd(newfd), flags or 0)) end end
function S.sendto(fd, buf, count, flags, addr, addrlen)
if not addr then addrlen = 0 end
local saddr = pt.sockaddr(addr)
return retnum(C.sendto(getfd(fd), buf, count or #buf, c.MSG[flags], saddr, addrlen or #addr))
end
function S.recvfrom(fd, buf, count, flags, addr, addrlen)
local saddr
if addr == false then
addr = nil
addrlen = nil
else
if addr then
addrlen = addrlen or #addr
else
addr = t.sockaddr_storage()
addrlen = addrlen or s.sockaddr_storage
end
if type(addrlen) == "number" then addrlen = t.socklen1(addrlen) end
saddr = pt.sockaddr(addr)
end
local ret, err = C.recvfrom(getfd(fd), buf, count or #buf, c.MSG[flags], saddr, addrlen) -- TODO addrlen 0 here???
ret = tonumber(ret)
if ret == -1 then return nil, t.error(err or errno()) end
if addr then return ret, nil, t.sa(addr, addrlen[0]) else return ret end
end
function S.sendmsg(fd, msg, flags)
if not msg then -- send a single byte message, eg enough to send credentials
local buf1 = t.buffer(1)
local io = t.iovecs{{buf1, 1}}
msg = t.msghdr{msg_iov = io.iov, msg_iovlen = #io}
end
return retnum(C.sendmsg(getfd(fd), msg, c.MSG[flags]))
end
function S.recvmsg(fd, msg, flags) return retnum(C.recvmsg(getfd(fd), msg, c.MSG[flags])) end
-- TODO better handling of msgvec, create one structure/table
if C.sendmmsg then
function S.sendmmsg(fd, msgvec, flags)
msgvec = mktype(t.mmsghdrs, msgvec)
return retbool(C.sendmmsg(getfd(fd), msgvec.msg, msgvec.count, c.MSG[flags]))
end
end
if C.recvmmsg then
function S.recvmmsg(fd, msgvec, flags, timeout)
if timeout then timeout = mktype(t.timespec, timeout) end
msgvec = mktype(t.mmsghdrs, msgvec)
return retbool(C.recvmmsg(getfd(fd), msgvec.msg, msgvec.count, c.MSG[flags], timeout))
end
end
-- TODO {get,set}sockopt may need better type handling see new unfinished sockopt file, plus not always c.SO[]
function S.setsockopt(fd, level, optname, optval, optlen)
-- allocate buffer for user, from Lua type if know how, int and bool so far
if not optlen and type(optval) == 'boolean' then optval = h.booltoc(optval) end
if not optlen and type(optval) == 'number' then
optval = t.int1(optval)
optlen = s.int
end
return retbool(C.setsockopt(getfd(fd), c.SOL[level], c.SO[optname], optval, optlen))
end
function S.getsockopt(fd, level, optname, optval, optlen)
if not optval then optval, optlen = t.int1(), s.int end
optlen = optlen or #optval
local len = t.socklen1(optlen)
local ret, err = C.getsockopt(getfd(fd), c.SOL[level], c.SO[optname], optval, len)
if ret == -1 then return nil, t.error(err or errno()) end
if len[0] ~= optlen then error("incorrect optlen for getsockopt: set " .. optlen .. " got " .. len[0]) end
return optval[0] -- TODO will not work if struct, eg see netfilter
end
function S.bind(sockfd, addr, addrlen)
local saddr = pt.sockaddr(addr)
return retbool(C.bind(getfd(sockfd), saddr, addrlen or #addr))
end
function S.listen(sockfd, backlog) return retbool(C.listen(getfd(sockfd), backlog or c.SOMAXCONN)) end
function S.connect(sockfd, addr, addrlen)
local saddr = pt.sockaddr(addr)
return retbool(C.connect(getfd(sockfd), saddr, addrlen or #addr))
end
function S.accept(sockfd, addr, addrlen)
local saddr = pt.sockaddr(addr)
if addr then addrlen = addrlen or t.socklen1() end
return retfd(C.accept(getfd(sockfd), saddr, addrlen))
end
function S.getsockname(sockfd, addr, addrlen)
addr = addr or t.sockaddr_storage()
addrlen = addrlen or t.socklen1(#addr)
local saddr = pt.sockaddr(addr)
local ret, err = C.getsockname(getfd(sockfd), saddr, addrlen)
if ret == -1 then return nil, t.error(err or errno()) end
return t.sa(addr, addrlen[0])
end
function S.getpeername(sockfd, addr, addrlen)
addr = addr or t.sockaddr_storage()
addrlen = addrlen or t.socklen1(#addr)
local saddr = pt.sockaddr(addr)
local ret, err = C.getpeername(getfd(sockfd), saddr, addrlen)
if ret == -1 then return nil, t.error(err or errno()) end
return t.sa(addr, addrlen[0])
end
function S.shutdown(sockfd, how) return retbool(C.shutdown(getfd(sockfd), c.SHUT[how])) end
function S.poll(fds, timeout) return retnum(C.poll(fds.pfd, #fds, timeout or -1)) end
-- TODO rework fdset interface, see issue #71
-- fdset handlers
local function mkfdset(fds, nfds) -- should probably check fd is within range (1024), or just expand structure size
local set = t.fdset()
for i, v in ipairs(fds) do
local fd = tonumber(getfd(v))
if fd + 1 > nfds then nfds = fd + 1 end
local fdelt = bit.rshift(fd, 5) -- always 32 bits
set.fds_bits[fdelt] = bit.bor(set.fds_bits[fdelt], bit.lshift(1, fd % 32)) -- always 32 bit words
end
return set, nfds
end
local function fdisset(fds, set)
local f = {}
for i, v in ipairs(fds) do
local fd = tonumber(getfd(v))
local fdelt = bit.rshift(fd, 5) -- always 32 bits
if bit.band(set.fds_bits[fdelt], bit.lshift(1, fd % 32)) ~= 0 then table.insert(f, v) end -- careful not to duplicate fd objects
end
return f
end
-- TODO convert to metatype. Problem is how to deal with nfds
function S.select(sel, timeout) -- note same structure as returned
local r, w, e
local nfds = 0
if timeout then timeout = mktype(t.timeval, timeout) end
r, nfds = mkfdset(sel.readfds or {}, nfds or 0)
w, nfds = mkfdset(sel.writefds or {}, nfds)
e, nfds = mkfdset(sel.exceptfds or {}, nfds)
local ret, err = C.select(nfds, r, w, e, timeout)
if ret == -1 then return nil, t.error(err or errno()) end
return {readfds = fdisset(sel.readfds or {}, r), writefds = fdisset(sel.writefds or {}, w),
exceptfds = fdisset(sel.exceptfds or {}, e), count = tonumber(ret)}
end
-- TODO note that in Linux syscall modifies timeout, which is non standard, like ppoll
function S.pselect(sel, timeout, set) -- note same structure as returned
local r, w, e
local nfds = 0
if timeout then timeout = mktype(t.timespec, timeout) end
if set then set = mktype(t.sigset, set) end
r, nfds = mkfdset(sel.readfds or {}, nfds or 0)
w, nfds = mkfdset(sel.writefds or {}, nfds)
e, nfds = mkfdset(sel.exceptfds or {}, nfds)
local ret, err = C.pselect(nfds, r, w, e, timeout, set)
if ret == -1 then return nil, t.error(err or errno()) end
return {readfds = fdisset(sel.readfds or {}, r), writefds = fdisset(sel.writefds or {}, w),
exceptfds = fdisset(sel.exceptfds or {}, e), count = tonumber(ret)}
end
function S.getuid() return C.getuid() end
function S.geteuid() return C.geteuid() end
function S.getpid() return C.getpid() end
function S.getppid() return C.getppid() end
function S.getgid() return C.getgid() end
function S.getegid() return C.getegid() end
function S.setuid(uid) return retbool(C.setuid(uid)) end
function S.setgid(gid) return retbool(C.setgid(gid)) end
function S.seteuid(uid) return retbool(C.seteuid(uid)) end
function S.setegid(gid) return retbool(C.setegid(gid)) end
function S.getsid(pid) return retnum(C.getsid(pid or 0)) end
function S.setsid() return retnum(C.setsid()) end
function S.setpgid(pid, pgid) return retbool(C.setpgid(pid or 0, pgid or 0)) end
function S.getpgid(pid) return retnum(C.getpgid(pid or 0)) end
function S.getpgrp() return retnum(C.getpgrp()) end
function S.getgroups()
local size = C.getgroups(0, nil) -- note for BSD could use NGROUPS_MAX instead
if size == -1 then return nil, t.error() end
local groups = t.groups(size)
local ret = C.getgroups(size, groups.list)
if ret == -1 then return nil, t.error() end
return groups
end
function S.setgroups(groups)
if type(groups) == "table" then groups = t.groups(groups) end
return retbool(C.setgroups(groups.count, groups.list))
end
function S.sigprocmask(how, set, oldset)
oldset = oldset or t.sigset()
if not set then how = c.SIGPM.SETMASK end -- value does not matter if set nil, just returns old set
local ret, err = C.sigprocmask(c.SIGPM[how], t.sigset(set), oldset)
if ret == -1 then return nil, t.error(err or errno()) end
return oldset
end
function S.sigpending()
local set = t.sigset()
local ret, err = C.sigpending(set)
if ret == -1 then return nil, t.error(err or errno()) end
return set
end
function S.sigsuspend(mask) return retbool(C.sigsuspend(t.sigset(mask))) end
function S.kill(pid, sig) return retbool(C.kill(pid, c.SIG[sig])) end
-- _exit is the real exit syscall, or whatever is suitable if overridden in c.lua; libc.lua may override
function S.exit(status) C._exit(c.EXIT[status or 0]) end
function S.fcntl(fd, cmd, arg)
cmd = c.F[cmd]
if fcntl.commands[cmd] then arg = fcntl.commands[cmd](arg) end
local ret, err = C.fcntl(getfd(fd), cmd, pt.void(arg or 0))
if ret == -1 then return nil, t.error(err or errno()) end
if fcntl.ret[cmd] then return fcntl.ret[cmd](ret, arg) end
return true
end
-- TODO return metatype that has length and can gc?
function S.mmap(addr, length, prot, flags, fd, offset)
return retptr(C.mmap(addr, length, c.PROT[prot], c.MAP[flags], getfd(fd or -1), offset or 0))
end
function S.munmap(addr, length)
return retbool(C.munmap(addr, length))
end
function S.msync(addr, length, flags) return retbool(C.msync(addr, length, c.MSYNC[flags])) end
function S.mlock(addr, len) return retbool(C.mlock(addr, len)) end
function S.munlock(addr, len) return retbool(C.munlock(addr, len)) end
function S.munlockall() return retbool(C.munlockall()) end
function S.madvise(addr, length, advice) return retbool(C.madvise(addr, length, c.MADV[advice])) end
function S.ioctl(d, request, argp)
local read, singleton = false, false
local name = request
if type(name) == "string" then
request = c.IOCTL[name]
end
if type(request) == "table" then
local write = request.write
local tp = request.type
read = request.read
singleton = request.singleton
request = request.number
if type(argp) ~= "string" and type(argp) ~= "cdata" and type ~= "userdata" then
if write then
if not argp then error("no argument supplied for ioctl " .. name) end
argp = mktype(tp, argp)
end
if read then
argp = argp or tp()
end
end
else -- some sane defaults if no info
if type(request) == "table" then request = request.number end
if type(argp) == "string" then argp = pt.char(argp) end
if type(argp) == "number" then argp = t.int1(argp) end
end
local ret, err = C.ioctl(getfd(d), request, argp)
if ret == -1 then return nil, t.error(err or errno()) end
if read and singleton then return argp[0] end
if read then return argp end
return true -- will need override for few linux ones that return numbers
end
function S.pipe(fd2)
fd2 = fd2 or t.int2()
local ret, err = C.pipe(fd2)
if ret == -1 then return nil, t.error(err or errno()) end
return true, nil, t.fd(fd2[0]), t.fd(fd2[1])
end
if C.gettimeofday then
function S.gettimeofday(tv)
tv = tv or t.timeval() -- note it is faster to pass your own tv if you call a lot
local ret, err = C.gettimeofday(tv, nil)
if ret == -1 then return nil, t.error(err or errno()) end
return tv
end
end
if C.settimeofday then
function S.settimeofday(tv) return retbool(C.settimeofday(tv, nil)) end
end
function S.getrusage(who, ru)
ru = ru or t.rusage()
local ret, err = C.getrusage(c.RUSAGE[who], ru)
if ret == -1 then return nil, t.error(err or errno()) end
return ru
end
function S.fork() return retnum(C.fork()) end
function S.execve(filename, argv, envp)
local cargv = t.string_array(#argv + 1, argv or {})
cargv[#argv] = nil -- LuaJIT does not zero rest of a VLA
local cenvp = t.string_array(#envp + 1, envp or {})
cenvp[#envp] = nil
return retbool(C.execve(filename, cargv, cenvp))
end
-- man page says obsolete for Linux, but implemented and useful for compatibility
function S.wait4(pid, options, ru, status) -- note order of arguments changed as rarely supply status (as waitpid)
if ru == false then ru = nil else ru = ru or t.rusage() end -- false means no allocation
status = status or t.int1()
local ret, err = C.wait4(c.WAIT[pid], status, c.W[options], ru)
if ret == -1 then return nil, t.error(err or errno()) end
return ret, nil, t.waitstatus(status[0]), ru
end
if C.waitpid then
function S.waitpid(pid, options, status) -- note order of arguments changed as rarely supply status
status = status or t.int1()
local ret, err = C.waitpid(c.WAIT[pid], status, c.W[options])
if ret == -1 then return nil, t.error(err or errno()) end
return ret, nil, t.waitstatus(status[0])
end
end
if S.waitid then
function S.waitid(idtype, id, options, infop) -- note order of args, as usually dont supply infop
if not infop then infop = t.siginfo() end
local ret, err = C.waitid(c.P[idtype], id or 0, infop, c.W[options])
if ret == -1 then return nil, t.error(err or errno()) end
return infop
end
end
function S.setpriority(which, who, prio) return retbool(C.setpriority(c.PRIO[which], who or 0, prio)) end
-- Linux overrides getpriority as it offsets return values so that they are not negative
function S.getpriority(which, who)
errno(0)
local ret, err = C.getpriority(c.PRIO[which], who or 0)
if ret == -1 and (err or errno()) ~= 0 then return nil, t.error(err or errno()) end
return ret
end
-- these may not always exist, but where they do they have the same interface
if C.creat then
function S.creat(pathname, mode) return retfd(C.creat(pathname, c.MODE[mode])) end
end
if C.pipe2 then
function S.pipe2(flags, fd2)
fd2 = fd2 or t.int2()
local ret, err = C.pipe2(fd2, c.OPIPE[flags])
if ret == -1 then return nil, t.error(err or errno()) end
return true, nil, t.fd(fd2[0]), t.fd(fd2[1])
end
end
if C.mlockall then
function S.mlockall(flags) return retbool(C.mlockall(c.MCL[flags])) end
end
if C.linkat then
function S.linkat(olddirfd, oldpath, newdirfd, newpath, flags)
return retbool(C.linkat(c.AT_FDCWD[olddirfd], oldpath, c.AT_FDCWD[newdirfd], newpath, c.AT[flags]))
end
end
if C.symlinkat then
function S.symlinkat(oldpath, newdirfd, newpath) return retbool(C.symlinkat(oldpath, c.AT_FDCWD[newdirfd], newpath)) end
end
if C.unlinkat then
function S.unlinkat(dirfd, path, flags) return retbool(C.unlinkat(c.AT_FDCWD[dirfd], path, c.AT[flags])) end
end
if C.renameat then
function S.renameat(olddirfd, oldpath, newdirfd, newpath)
return retbool(C.renameat(c.AT_FDCWD[olddirfd], oldpath, c.AT_FDCWD[newdirfd], newpath))
end
end
if C.mkdirat then
function S.mkdirat(fd, path, mode) return retbool(C.mkdirat(c.AT_FDCWD[fd], path, c.MODE[mode])) end
end
if C.fchownat then
function S.fchownat(dirfd, path, owner, group, flags)
return retbool(C.fchownat(c.AT_FDCWD[dirfd], path, owner or -1, group or -1, c.AT[flags]))
end
end
if C.faccessat then
function S.faccessat(dirfd, pathname, mode, flags)
return retbool(C.faccessat(c.AT_FDCWD[dirfd], pathname, c.OK[mode], c.AT[flags]))
end
end
if C.readlinkat then
function S.readlinkat(dirfd, path, buffer, size)
size = size or c.PATH_MAX
buffer = buffer or t.buffer(size)
local ret, err = C.readlinkat(c.AT_FDCWD[dirfd], path, buffer, size)
ret = tonumber(ret)
if ret == -1 then return nil, t.error(err or errno()) end
return ffi.string(buffer, ret)
end
end
if C.mknodat then
function S.mknodat(fd, pathname, mode, dev)
return retbool(C.mknodat(c.AT_FDCWD[fd], pathname, c.S_I[mode], getdev(dev) or 0))
end
end
if C.utimensat then
function S.utimensat(dirfd, path, ts, flags)
if ts then ts = t.timespec2(ts) end -- TODO use mktype?
return retbool(C.utimensat(c.AT_FDCWD[dirfd], path, ts, c.AT[flags]))
end
end
if C.fstatat then
function S.fstatat(fd, path, buf, flags)
if not buf then buf = t.stat() end
local ret, err = C.fstatat(c.AT_FDCWD[fd], path, buf, c.AT[flags])
if ret == -1 then return nil, t.error(err or errno()) end
return buf
end
end
if C.fchmodat then
function S.fchmodat(dirfd, pathname, mode, flags)
return retbool(C.fchmodat(c.AT_FDCWD[dirfd], pathname, c.MODE[mode], c.AT[flags]))
end
end
if C.openat then
function S.openat(dirfd, pathname, flags, mode)
return retfd(C.openat(c.AT_FDCWD[dirfd], pathname, c.O[flags], c.MODE[mode]))
end
end
if C.fchroot then
function S.fchroot(fd) return retbool(C.fchroot(getfd(fd))) end
end
if C.lchmod then
function S.lchmod(path, mode) return retbool(C.lchmod(path, c.MODE[mode])) end
end
if C.fdatasync then
function S.fdatasync(fd) return retbool(C.fdatasync(getfd(fd))) end
end
-- Linux does not have mkfifo syscalls, emulated
if C.mkfifo then
function S.mkfifo(pathname, mode) return retbool(C.mkfifo(pathname, c.S_I[mode])) end
end
if C.mkfifoat then
function S.mkfifoat(dirfd, pathname, mode) return retbool(C.mkfifoat(c.AT_FDCWD[dirfd], pathname, c.S_I[mode])) end
end
if C.utimes then
function S.utimes(filename, ts)
if ts then ts = t.timeval2(ts) end
return retbool(C.utimes(filename, ts))
end
end
if C.lutimes then
function S.lutimes(filename, ts)
if ts then ts = t.timeval2(ts) end
return retbool(C.lutimes(filename, ts))
end
end
if C.futimes then
function S.futimes(fd, ts)
if ts then ts = t.timeval2(ts) end
return retbool(C.futimes(getfd(fd), ts))
end
end
if C.getdents then
function S.getdents(fd, buf, size)
size = size or 4096 -- may have to be equal to at least block size of fs
buf = buf or t.buffer(size)
local ret, err = C.getdents(getfd(fd), buf, size)
if ret == -1 then return nil, t.error(err or errno()) end
return t.dirents(buf, ret)
end
end
if C.futimens then
function S.futimens(fd, ts)
if ts then ts = t.timespec2(ts) end
return retbool(C.futimens(getfd(fd), ts))
end
end
if C.accept4 then
function S.accept4(sockfd, addr, addrlen, flags)
local saddr = pt.sockaddr(addr)
if addr then addrlen = addrlen or t.socklen1() end
return retfd(C.accept4(getfd(sockfd), saddr, addrlen, c.SOCK[flags]))
end
end
if C.sigaction then
function S.sigaction(signum, handler, oldact)
if type(handler) == "string" or type(handler) == "function" then
handler = {handler = handler, mask = "", flags = 0} -- simple case like signal
end
if handler then handler = mktype(t.sigaction, handler) end
return retbool(C.sigaction(c.SIG[signum], handler, oldact))
end
end
if C.getitimer then
function S.getitimer(which, value)
value = value or t.itimerval()
local ret, err = C.getitimer(c.ITIMER[which], value)
if ret == -1 then return nil, t.error(err or errno()) end
return value
end
end
if C.setitimer then
function S.setitimer(which, it, oldtime)
oldtime = oldtime or t.itimerval()
local ret, err = C.setitimer(c.ITIMER[which], mktype(t.itimerval, it), oldtime)
if ret == -1 then return nil, t.error(err or errno()) end
return oldtime
end
end
if C.clock_getres then
function S.clock_getres(clk_id, ts)
ts = ts or t.timespec()
local ret, err = C.clock_getres(c.CLOCK[clk_id], ts)
if ret == -1 then return nil, t.error(err or errno()) end
return ts
end
end
if C.clock_gettime then
function S.clock_gettime(clk_id, ts)
ts = ts or t.timespec()
local ret, err = C.clock_gettime(c.CLOCK[clk_id], ts)
if ret == -1 then return nil, t.error(err or errno()) end
return ts
end
end
if C.clock_settime then
function S.clock_settime(clk_id, ts)
ts = mktype(t.timespec, ts)
return retbool(C.clock_settime(c.CLOCK[clk_id], ts))
end
end
if C.clock_nanosleep then
function S.clock_nanosleep(clk_id, flags, req, rem)
rem = rem or t.timespec()
local ret, err = C.clock_nanosleep(c.CLOCK[clk_id], c.TIMER[flags or 0], mktype(t.timespec, req), rem)
if ret == -1 then
if (err or errno()) == c.E.INTR then return true, nil, rem else return nil, t.error(err or errno()) end
end
return true -- no time remaining
end
end
if C.timer_create then
function S.timer_create(clk_id, sigev, timerid)
timerid = timerid or t.timer()
if sigev then sigev = mktype(t.sigevent, sigev) end
local ret, err = C.timer_create(c.CLOCK[clk_id], sigev, timerid:gettimerp())
if ret == -1 then return nil, t.error(err or errno()) end
return timerid
end
function S.timer_delete(timerid) return retbool(C.timer_delete(timerid:gettimer())) end
function S.timer_settime(timerid, flags, new_value, old_value)
if old_value ~= false then old_value = old_value or t.itimerspec() else old_value = nil end
new_value = mktype(t.itimerspec, new_value)
local ret, err = C.timer_settime(timerid:gettimer(), c.TIMER[flags], new_value, old_value)
if ret == -1 then return nil, t.error(err or errno()) end
return true, nil, old_value
end
function S.timer_gettime(timerid, curr_value)
curr_value = curr_value or t.itimerspec()
local ret, err = C.timer_gettime(timerid:gettimer(), curr_value)
if ret == -1 then return nil, t.error(err or errno()) end
return curr_value
end
function S.timer_getoverrun(timerid) return retnum(C.timer_getoverrun(timerid:gettimer())) end
end
-- legacy in many OSs, implemented using recvfrom, sendto
if C.send then
function S.send(fd, buf, count, flags) return retnum(C.send(getfd(fd), buf, count, c.MSG[flags])) end
end
if C.recv then
function S.recv(fd, buf, count, flags) return retnum(C.recv(getfd(fd), buf, count, c.MSG[flags], false)) end
end
-- TODO not sure about this interface, maybe return rem as extra parameter see #103
if C.nanosleep then
function S.nanosleep(req, rem)
rem = rem or t.timespec()
local ret, err = C.nanosleep(mktype(t.timespec, req), rem)
if ret == -1 then
if (err or errno()) == c.E.INTR then return true, nil, rem else return nil, t.error(err or errno()) end
end
return true -- no time remaining
end
end
-- getpagesize might be a syscall, or in libc, or may not exist
if C.getpagesize then
function S.getpagesize() return retnum(C.getpagesize()) end
end
if C.syncfs then
function S.syncfs(fd) return retbool(C.syncfs(getfd(fd))) end
end
-- although the pty functions are not syscalls, we include here, like eg shm functions, as easier to provide as methods on fds
-- Freebsd has a syscall, other OSs use /dev/ptmx
if C.posix_openpt then
function S.posix_openpt(flags) return retfd(C.posix_openpt(c.O[flags])) end
else
function S.posix_openpt(flags) return S.open("/dev/ptmx", flags) end
end
S.openpt = S.posix_openpt
function S.isatty(fd)
local tc, err = S.tcgetattr(fd)
if tc then return true else return nil, err end
end
if c.IOCTL.TIOCGSID then -- OpenBSD only has in legacy ioctls
function S.tcgetsid(fd) return S.ioctl(fd, "TIOCGSID") end
end
-- now call OS specific for non-generic calls
local hh = {
ret64 = ret64, retnum = retnum, retfd = retfd, retbool = retbool, retptr = retptr, retiter = retiter
}
if (abi.rump and abi.types == "netbsd") or (not abi.rump and abi.bsd) then
S = require("syscall.bsd.syscalls")(S, hh, c, C, types)
end
S = require("syscall." .. abi.os .. ".syscalls")(S, hh, c, C, types)
return S
end
return {init = init}