FreeBSD System Calls
The sys package, when compiled for FreeBSD, contained an interface to the
FreeBSD system calls. At the moment, this list is fairly incomplete. It is
missing a large number of data structures, and is not wrapping a large number
of useful calls.
Summary
Overall, this documentation will not attempt to summarize the full behavior of the system calls, but will instead attempt to highlight where system calls diverge from the libc interfaces, which are documented in section 2 of the system manpages.
The most notable divergence is that instead of returning -1 and putting an
error code in errno, Myrddin's interface to the system call returns
-errno directly from the functions. The kernel returns the error code
with the overflow flag set in the CPU, and the system call wrappers check
this and convert the return value to a negative error code.
The other notable divergence is that short zero terminated strings strings
such as file names are wrapped up as a byte[:], but are generally converted
to strings on the stack before being passed to the kernel. Long buffers that
are exposed to C as a char* buf, size_t len pair are exposed to Myrddin code
as simply accepting a byte[:].
There are a couple of symbols that aren't actually system calls, such as the clock_gettime functions. These are faked with gettimeofday for portability.
Exported Symbols
pkg sys =
type pid = int /* process id */
type scno = int64 /*syscall*/
type fdopt = int64 /* fd options */
type fd = int32 /* fd */
type whence = uint64 /* seek from whence */
type mprot = int64 /* memory protection */
type mopt = int64 /* memory mapping options */
type socktype = int64 /* socket type */
type sockproto = int64 /* socket protocol */
type sockfam = uint8 /* socket family */
type filemode = uint16
type filetype = uint8
type fcntlcmd = int64
type clock = union
`Clockrealtime
`Clockrealtime_precise
`Clockrealtime_fast
`Clockmonotonic
`Clockmonotonic_precise
`Clockmonotonic_fast
`Clockuptime
`Clockuptime_precise
`Clockuptime_fast
`Clockvirtual
`Clockprof
`Clocksecond
;;
type waitstatus = union
`Waitfail int32
`Waitexit int32
`Waitsig int32
`Waitstop int32
;;
type timespec = struct
sec : uint64
nsec : uint64
;;
type timeval = struct
sec : uint64
usec : uint64
;;
type rusage = struct
utime : timeval /* user time */
stime : timeval /* system time */
maxrss : uint64 /* max resident set size*/
ixrss : uint64 /* shared text size */
idrss : uint64 /* unshared data size */
isrss : uint64 /* unshared stack size */
minflt : uint64 /* page reclaims */
majflt : uint64 /* page faults */
nswap : uint64 /* swaps */
inblock : uint64 /* block input ops */
oublock : uint64 /* block output ops */
msgsnd : uint64 /* messages sent */
msgrcv : uint64 /* messages received */
nsignals : uint64 /* signals received */
nvcsw : uint64 /* voluntary context switches */
nivcsw : uint64 /* involuntary context switches */
;;
type statbuf = struct
dev : uint32
ino : uint32
mode : filemode
nlink : uint16
uid : uint32
gid : uint32
rdev : uint32
atime : timespec
mtime : timespec
ctime : timespec
size : int64
blocks : int64
blksize : uint32
flags : uint32
gen : uint32
lspare : int32
birthtim : timespec
;;
type utsname = struct
system : byte[32]
node : byte[32]
release : byte[32]
version : byte[32]
machine : byte[32]
;;
type sockaddr = struct
len : byte
fam : sockfam
data : byte[14] /* what is the *actual* length? */
;;
type sockaddr_in = struct
len : byte
fam : sockfam
port : uint16
addr : byte[4]
zero : byte[8]
;;
type sockaddr_in6 = struct
len : byte
fam : sockfam
port : uint16
flow : uint32
addr : byte[16]
scope : uint32
;;
type sockaddr_storage = struct
len : byte
fam : sockfam
__pad1 : byte[6]
__align : int64
__pad2 : byte[112]
;;
type dirent = struct
fileno : uint32
reclen : uint16
ftype : filetype
namelen : uint8
name : byte[256]
;;
/* open options */
const Ordonly : fdopt = 0x0
const Owronly : fdopt = 0x1
const Ordwr : fdopt = 0x2
const Oappend : fdopt = 0x8
const Ocreat : fdopt = 0x200
const Onofollow : fdopt = 0x100
const Ondelay : fdopt = 0x4
const Otrunc : fdopt = 0x400
const Odir : fdopt = 0x20000
/* stat modes */
const Sifmt : filemode = 0xf000
const Sififo : filemode = 0x1000
const Sifchr : filemode = 0x2000
const Sifdir : filemode = 0x4000
const Sifblk : filemode = 0x6000
const Sifreg : filemode = 0x8000
const Siflnk : filemode = 0xa000
const Sifsock : filemode = 0xc000
/* mmap protection */
const Mprotnone : mprot = 0x0
const Mprotrd : mprot = 0x1
const Mprotwr : mprot = 0x2
const Mprotexec : mprot = 0x4
const Mprotrw : mprot = 0x3
/* mmap options */
const Mshared : mopt = 0x1
const Mpriv : mopt = 0x2
const Mfixed : mopt = 0x10
const Mfile : mopt = 0x0
const Manon : mopt = 0x1000
const M32bit : mopt = 0x80000
/* file types */
const Dtunknown : filetype = 0
const Dtfifo : filetype = 1
const Dtchr : filetype = 2
const Dtdir : filetype = 4
const Dtblk : filetype = 6
const Dtreg : filetype = 8
const Dtlnk : filetype = 10
const Dtsock : filetype = 12
const Dtwht : filetype = 14
/* socket families. INCOMPLETE. */
const Afunspec : sockfam = 0
const Afunix : sockfam = 1
const Afinet : sockfam = 2
const Afinet6 : sockfam = 28
/* socket types. */
const Sockstream : socktype = 1
const Sockdgram : socktype = 2
const Sockraw : socktype = 3
const Sockrdm : socktype = 4
const Sockseqpacket : socktype = 5
/* network protocols */
const Ipproto_ip : sockproto = 0
const Ipproto_icmp : sockproto = 1
const Ipproto_tcp : sockproto = 6
const Ipproto_udp : sockproto = 17
const Ipproto_raw : sockproto = 255
const Seekset : whence = 0
const Seekcur : whence = 1
const Seekend : whence = 2
/* system specific constants */
const Maxpathlen : size = 1024
/* fcntl constants */
const Fdupfd : fcntlcmd = 0 /* duplicate file descriptor */
const Fgetfd : fcntlcmd = 1 /* get file descriptor flags */
const Fsetfd : fcntlcmd = 2 /* set file descriptor flags */
const Fgetfl : fcntlcmd = 3 /* get file status flags */
const Fsetfl : fcntlcmd = 4 /* set file status flags */
const Fgetown : fcntlcmd = 5 /* get SIGIO/SIGURG proc/pgrp */
const Fsetown : fcntlcmd = 6 /* set SIGIO/SIGURG proc/pgrp */
const Fogetlk : fcntlcmd = 7 /* get record locking information */
const Fosetlk : fcntlcmd = 8 /* set record locking information */
const Fosetlkw : fcntlcmd = 9 /* F_SETLK; wait if blocked */
const Fdup2fd : fcntlcmd = 10 /* duplicate file descriptor to arg */
const Fgetlk : fcntlcmd = 11 /* get record locking information */
const Fsetlk : fcntlcmd = 12 /* set record locking information */
const Fsetlkw : fcntlcmd = 13 /* F_SETLK; wait if blocked */
const Fsetlk_remote : fcntlcmd = 14 /* debugging support for remote locks */
const Freadahead : fcntlcmd = 15 /* read ahead */
const Frdahead : fcntlcmd = 16 /* Darwin compatible read ahead */
const Fdupfd_cloexec : fcntlcmd = 17 /* Like F_DUPFD, but FD_CLOEXEC is set */
const Fdup2fd_cloexec : fcntlcmd = 18 /* Like F_DUP2FD, but FD_CLOEXEC is set */
/* return value for a failed mapping */
const Mapbad : byte# = -1 castto(byte#)
/* syscalls */
const Syssyscall : scno = 0
const Sysexit : scno = 1
const Sysfork : scno = 2
const Sysread : scno = 3
const Syswrite : scno = 4
const Sysopen : scno = 5
const Sysclose : scno = 6
const Syswait4 : scno = 7
const Syslink : scno = 9
const Sysunlink : scno = 10
const Syschdir : scno = 12
const Sysfchdir : scno = 13
const Sysmknod : scno = 14
const Syschmod : scno = 15
const Syschown : scno = 16
const Sysbreak : scno = 17
const Sysfreebsd4_getfsstat : scno = 18
const Sysgetpid : scno = 20
const Sysmount : scno = 21
const Sysunmount : scno = 22
const Syssetuid : scno = 23
const Sysgetuid : scno = 24
const Sysgeteuid : scno = 25
const Sysptrace : scno = 26
const Sysrecvmsg : scno = 27
const Syssendmsg : scno = 28
const Sysrecvfrom : scno = 29
const Sysaccept : scno = 30
const Sysgetpeername : scno = 31
const Sysgetsockname : scno = 32
const Sysaccess : scno = 33
const Syschflags : scno = 34
const Sysfchflags : scno = 35
const Syssync : scno = 36
const Syskill : scno = 37
const Sysgetppid : scno = 39
const Sysdup : scno = 41
const Syspipe : scno = 42
const Sysgetegid : scno = 43
const Sysprofil : scno = 44
const Sysktrace : scno = 45
const Sysgetgid : scno = 47
const Sysgetlogin : scno = 49
const Syssetlogin : scno = 50
const Sysacct : scno = 51
const Syssigaltstack : scno = 53
const Sysioctl : scno = 54
const Sysreboot : scno = 55
const Sysrevoke : scno = 56
const Syssymlink : scno = 57
const Sysreadlink : scno = 58
const Sysexecve : scno = 59
const Sysumask : scno = 60
const Syschroot : scno = 61
const Sysmsync : scno = 65
const Sysvfork : scno = 66
const Syssbrk : scno = 69
const Syssstk : scno = 70
const Sysvadvise : scno = 72
const Sysmunmap : scno = 73
const Sysmprotect : scno = 74
const Sysmadvise : scno = 75
const Sysmincore : scno = 78
const Sysgetgroups : scno = 79
const Syssetgroups : scno = 80
const Sysgetpgrp : scno = 81
const Syssetpgid : scno = 82
const Syssetitimer : scno = 83
const Sysswapon : scno = 85
const Sysgetitimer : scno = 86
const Sysgetdtablesize : scno = 89
const Sysdup2 : scno = 90
const Sysfcntl : scno = 92
const Sysselect : scno = 93
const Sysfsync : scno = 95
const Syssetpriority : scno = 96
const Syssocket : scno = 97
const Sysconnect : scno = 98
const Sysgetpriority : scno = 100
const Sysbind : scno = 104
const Syssetsockopt : scno = 105
const Syslisten : scno = 106
const Sysgettimeofday : scno = 116
const Sysgetrusage : scno = 117
const Sysgetsockopt : scno = 118
const Sysreadv : scno = 120
const Syswritev : scno = 121
const Syssettimeofday : scno = 122
const Sysfchown : scno = 123
const Sysfchmod : scno = 124
const Syssetreuid : scno = 126
const Syssetregid : scno = 127
const Sysrename : scno = 128
const Sysflock : scno = 131
const Sysmkfifo : scno = 132
const Syssendto : scno = 133
const Sysshutdown : scno = 134
const Syssocketpair : scno = 135
const Sysmkdir : scno = 136
const Sysrmdir : scno = 137
const Sysutimes : scno = 138
const Sysadjtime : scno = 140
const Syssetsid : scno = 147
const Sysquotactl : scno = 148
const Sysnlm_syscall : scno = 154
const Sysnfssvc : scno = 155
const Sysfreebsd4_statfs : scno = 157
const Sysfreebsd4_fstatfs : scno = 158
const Syslgetfh : scno = 160
const Sysgetfh : scno = 161
const Sysfreebsd4_getdomainname : scno = 162
const Sysfreebsd4_setdomainname : scno = 163
const Sysfreebsd4_uname : scno = 164
const Syssysarch : scno = 165
const Sysrtprio : scno = 166
const Syssemsys : scno = 169
const Sysmsgsys : scno = 170
const Sysshmsys : scno = 171
const Sysfreebsd6_pread : scno = 173
const Sysfreebsd6_pwrite : scno = 174
const Syssetfib : scno = 175
const Sysntp_adjtime : scno = 176
const Syssetgid : scno = 181
const Syssetegid : scno = 182
const Sysseteuid : scno = 183
const Sysstat : scno = 188
const Sysfstat : scno = 189
const Syslstat : scno = 190
const Syspathconf : scno = 191
const Sysfpathconf : scno = 192
const Sysgetrlimit : scno = 194
const Syssetrlimit : scno = 195
const Sysgetdirentries : scno = 196
const Sysfreebsd6_mmap : scno = 197
const Sys__syscall : scno = 198
const Sysfreebsd6_lseek : scno = 199
const Sysfreebsd6_truncate : scno = 200
const Sysfreebsd6_ftruncate : scno = 201
const Sys__sysctl : scno = 202
const Sysmlock : scno = 203
const Sysmunlock : scno = 204
const Sysundelete : scno = 205
const Sysfutimes : scno = 206
const Sysgetpgid : scno = 207
const Syspoll : scno = 209
const Sysfreebsd7___semctl : scno = 220
const Syssemget : scno = 221
const Syssemop : scno = 222
const Sysfreebsd7_msgctl : scno = 224
const Sysmsgget : scno = 225
const Sysmsgsnd : scno = 226
const Sysmsgrcv : scno = 227
const Sysshmat : scno = 228
const Sysfreebsd7_shmctl : scno = 229
const Sysshmdt : scno = 230
const Sysshmget : scno = 231
const Sysclock_gettime : scno = 232
const Sysclock_settime : scno = 233
const Sysclock_getres : scno = 234
const Sysktimer_create : scno = 235
const Sysktimer_delete : scno = 236
const Sysktimer_settime : scno = 237
const Sysktimer_gettime : scno = 238
const Sysktimer_getoverrun : scno = 239
const Sysnanosleep : scno = 240
const Sysffclock_getcounter : scno = 241
const Sysffclock_setestimate : scno = 242
const Sysffclock_getestimate : scno = 243
const Sysclock_getcpuclockid2 : scno = 247
const Sysntp_gettime : scno = 248
const Sysminherit : scno = 250
const Sysrfork : scno = 251
const Sysopenbsd_poll : scno = 252
const Sysissetugid : scno = 253
const Syslchown : scno = 254
const Sysaio_read : scno = 255
const Sysaio_write : scno = 256
const Syslio_listio : scno = 257
const Sysgetdents : scno = 272
const Syslchmod : scno = 274
const Sysnetbsd_lchown : scno = 275
const Syslutimes : scno = 276
const Sysnetbsd_msync : scno = 277
const Sysnstat : scno = 278
const Sysnfstat : scno = 279
const Sysnlstat : scno = 280
const Syspreadv : scno = 289
const Syspwritev : scno = 290
const Sysfreebsd4_fhstatfs : scno = 297
const Sysfhopen : scno = 298
const Sysfhstat : scno = 299
const Sysmodnext : scno = 300
const Sysmodstat : scno = 301
const Sysmodfnext : scno = 302
const Sysmodfind : scno = 303
const Syskldload : scno = 304
const Syskldunload : scno = 305
const Syskldfind : scno = 306
const Syskldnext : scno = 307
const Syskldstat : scno = 308
const Syskldfirstmod : scno = 309
const Sysgetsid : scno = 310
const Syssetresuid : scno = 311
const Syssetresgid : scno = 312
const Sysaio_return : scno = 314
const Sysaio_suspend : scno = 315
const Sysaio_cancel : scno = 316
const Sysaio_error : scno = 317
const Sysoaio_read : scno = 318
const Sysoaio_write : scno = 319
const Sysolio_listio : scno = 320
const Sysyield : scno = 321
const Sysmlockall : scno = 324
const Sysmunlockall : scno = 325
const Sys__getcwd : scno = 326
const Syssched_setparam : scno = 327
const Syssched_getparam : scno = 328
const Syssched_setscheduler : scno = 329
const Syssched_getscheduler : scno = 330
const Syssched_yield : scno = 331
const Syssched_get_priority_max : scno = 332
const Syssched_get_priority_min : scno = 333
const Syssched_rr_get_interval : scno = 334
const Sysutrace : scno = 335
const Sysfreebsd4_sendfile : scno = 336
const Syskldsym : scno = 337
const Sysjail : scno = 338
const Sysnnpfs_syscall : scno = 339
const Syssigprocmask : scno = 340
const Syssigsuspend : scno = 341
const Sysfreebsd4_sigaction : scno = 342
const Syssigpending : scno = 343
const Sysfreebsd4_sigreturn : scno = 344
const Syssigtimedwait : scno = 345
const Syssigwaitinfo : scno = 346
const Sys__acl_get_file : scno = 347
const Sys__acl_set_file : scno = 348
const Sys__acl_get_fd : scno = 349
const Sys__acl_set_fd : scno = 350
const Sys__acl_delete_file : scno = 351
const Sys__acl_delete_fd : scno = 352
const Sys__acl_aclcheck_file : scno = 353
const Sys__acl_aclcheck_fd : scno = 354
const Sysextattrctl : scno = 355
const Sysextattr_set_file : scno = 356
const Sysextattr_get_file : scno = 357
const Sysextattr_delete_file : scno = 358
const Sysaio_waitcomplete : scno = 359
const Sysgetresuid : scno = 360
const Sysgetresgid : scno = 361
const Syskqueue : scno = 362
const Syskevent : scno = 363
const Sysextattr_set_fd : scno = 371
const Sysextattr_get_fd : scno = 372
const Sysextattr_delete_fd : scno = 373
const Sys__setugid : scno = 374
const Syseaccess : scno = 376
const Sysafs3_syscall : scno = 377
const Sysnmount : scno = 378
const Sys__mac_get_proc : scno = 384
const Sys__mac_set_proc : scno = 385
const Sys__mac_get_fd : scno = 386
const Sys__mac_get_file : scno = 387
const Sys__mac_set_fd : scno = 388
const Sys__mac_set_file : scno = 389
const Syskenv : scno = 390
const Syslchflags : scno = 391
const Sysuuidgen : scno = 392
const Syssendfile : scno = 393
const Sysmac_syscall : scno = 394
const Sysgetfsstat : scno = 395
const Sysstatfs : scno = 396
const Sysfstatfs : scno = 397
const Sysfhstatfs : scno = 398
const Sysksem_close : scno = 400
const Sysksem_post : scno = 401
const Sysksem_wait : scno = 402
const Sysksem_trywait : scno = 403
const Sysksem_init : scno = 404
const Sysksem_open : scno = 405
const Sysksem_unlink : scno = 406
const Sysksem_getvalue : scno = 407
const Sysksem_destroy : scno = 408
const Sys__mac_get_pid : scno = 409
const Sys__mac_get_link : scno = 410
const Sys__mac_set_link : scno = 411
const Sysextattr_set_link : scno = 412
const Sysextattr_get_link : scno = 413
const Sysextattr_delete_link : scno = 414
const Sys__mac_execve : scno = 415
const Syssigaction : scno = 416
const Syssigreturn : scno = 417
const Sysgetcontext : scno = 421
const Syssetcontext : scno = 422
const Sysswapcontext : scno = 423
const Sysswapoff : scno = 424
const Sys__acl_get_link : scno = 425
const Sys__acl_set_link : scno = 426
const Sys__acl_delete_link : scno = 427
const Sys__acl_aclcheck_link : scno = 428
const Syssigwait : scno = 429
const Systhr_create : scno = 430
const Systhr_exit : scno = 431
const Systhr_self : scno = 432
const Systhr_kill : scno = 433
const Sys_umtx_lock : scno = 434
const Sys_umtx_unlock : scno = 435
const Sysjail_attach : scno = 436
const Sysextattr_list_fd : scno = 437
const Sysextattr_list_file : scno = 438
const Sysextattr_list_link : scno = 439
const Sysksem_timedwait : scno = 441
const Systhr_suspend : scno = 442
const Systhr_wake : scno = 443
const Syskldunloadf : scno = 444
const Sysaudit : scno = 445
const Sysauditon : scno = 446
const Sysgetauid : scno = 447
const Syssetauid : scno = 448
const Sysgetaudit : scno = 449
const Syssetaudit : scno = 450
const Sysgetaudit_addr : scno = 451
const Syssetaudit_addr : scno = 452
const Sysauditctl : scno = 453
const Sys_umtx_op : scno = 454
const Systhr_new : scno = 455
const Syssigqueue : scno = 456
const Syskmq_open : scno = 457
const Syskmq_setattr : scno = 458
const Syskmq_timedreceive : scno = 459
const Syskmq_timedsend : scno = 460
const Syskmq_notify : scno = 461
const Syskmq_unlink : scno = 462
const Sysabort2 : scno = 463
const Systhr_set_name : scno = 464
const Sysaio_fsync : scno = 465
const Sysrtprio_thread : scno = 466
const Syssctp_peeloff : scno = 471
const Syssctp_generic_sendmsg : scno = 472
const Syssctp_generic_sendmsg_iov : scno = 473
const Syssctp_generic_recvmsg : scno = 474
const Syspread : scno = 475
const Syspwrite : scno = 476
const Sysmmap : scno = 477
const Syslseek : scno = 478
const Systruncate : scno = 479
const Sysftruncate : scno = 480
const Systhr_kill2 : scno = 481
const Sysshm_open : scno = 482
const Sysshm_unlink : scno = 483
const Syscpuset : scno = 484
const Syscpuset_setid : scno = 485
const Syscpuset_getid : scno = 486
const Syscpuset_getaffinity : scno = 487
const Syscpuset_setaffinity : scno = 488
const Sysfaccessat : scno = 489
const Sysfchmodat : scno = 490
const Sysfchownat : scno = 491
const Sysfexecve : scno = 492
const Sysfstatat : scno = 493
const Sysfutimesat : scno = 494
const Syslinkat : scno = 495
const Sysmkdirat : scno = 496
const Sysmkfifoat : scno = 497
const Sysmknodat : scno = 498
const Sysopenat : scno = 499
const Sysreadlinkat : scno = 500
const Sysrenameat : scno = 501
const Syssymlinkat : scno = 502
const Sysunlinkat : scno = 503
const Sysposix_openpt : scno = 504
const Sysgssd_syscall : scno = 505
const Sysjail_get : scno = 506
const Sysjail_set : scno = 507
const Sysjail_remove : scno = 508
const Sysclosefrom : scno = 509
const Sys__semctl : scno = 510
const Sysmsgctl : scno = 511
const Sysshmctl : scno = 512
const Syslpathconf : scno = 513
const Sys__cap_rights_get : scno = 515
const Syscap_enter : scno = 516
const Syscap_getmode : scno = 517
const Syspdfork : scno = 518
const Syspdkill : scno = 519
const Syspdgetpid : scno = 520
const Syspselect : scno = 522
const Sysgetloginclass : scno = 523
const Syssetloginclass : scno = 524
const Sysrctl_get_racct : scno = 525
const Sysrctl_get_rules : scno = 526
const Sysrctl_get_limits : scno = 527
const Sysrctl_add_rule : scno = 528
const Sysrctl_remove_rule : scno = 529
const Sysposix_fallocate : scno = 530
const Sysposix_fadvise : scno = 531
const Syswait6 : scno = 532
const Syscap_rights_limit : scno = 533
const Syscap_ioctls_limit : scno = 534
const Syscap_ioctls_get : scno = 535
const Syscap_fcntls_limit : scno = 536
const Syscap_fcntls_get : scno = 537
const Sysbindat : scno = 538
const Sysconnectat : scno = 539
const Syschflagsat : scno = 540
const Sysaccept4 : scno = 541
const Syspipe2 : scno = 542
const Sysaio_mlock : scno = 543
const Sysprocctl : scno = 544
extern const syscall : (sc:scno, args:... -> int64)
/* process control */
const exit : (status:int -> void)
const getpid : ( -> pid)
const kill : (pid:pid, sig:int64 -> int64)
const fork : (-> pid)
const wait4 : (pid:pid, loc:int32#, opt : int64, usage:rusage# -> int64)
const waitpid : (pid:pid, loc:int32#, opt : int64 -> int64)
const execv : (cmd : byte[:], args : byte[:][:] -> int64)
const execve : (cmd : byte[:], args : byte[:][:], env : byte[:][:] -> int64)
/* wrappers to extract wait status */
const waitstatus : (st : int32 -> waitstatus)
/* fd manipulation */
const open : (path:byte[:], opts:fdopt -> fd)
const openmode : (path:byte[:], opts:fdopt, mode:int64 -> fd)
const close : (fd:fd -> int64)
const creat : (path:byte[:], mode:int64 -> fd)
const unlink : (path:byte[:] -> int)
const read : (fd:fd, buf:byte[:] -> size)
const write : (fd:fd, buf:byte[:] -> size)
const lseek : (fd:fd, off : off, whence : whence -> int64)
const stat : (path:byte[:], sb:statbuf# -> int64)
const lstat : (path:byte[:], sb:statbuf# -> int64)
const fstat : (fd:fd, sb:statbuf# -> int64)
const mkdir : (path : byte[:], mode : int64 -> int64)
generic ioctl : (fd:fd, req : int64, arg:@a# -> int64)
const getdirentries : (fd : fd, buf : byte[:], basep : int64# -> int64)
const chdir : (p : byte[:] -> int64)
const __getcwd : (buf : byte[:] -> int64)
/* fd stuff */
const pipe : (fds : fd[2]# -> int64)
const dup : (fd : fd -> fd)
const dup2 : (src : fd, dst : fd -> fd)
/* NB: the C ABI uses '...' for the args. */
const fcntl : (fd : fd, cmd : fcntlcmd, args : byte# -> int64)
/* networking */
const socket : (dom : sockfam, stype : socktype, proto : sockproto -> fd)
const connect : (sock : fd, addr : sockaddr#, len : size -> int)
const accept : (sock : fd, addr : sockaddr#, len : size# -> fd)
const listen : (sock : fd, backlog : int -> int)
const bind : (sock : fd, addr : sockaddr#, len : size -> int)
/* memory mapping */
const munmap : (addr:byte#, len:size -> int64)
const mmap : (addr:byte#, len:size, prot:mprot, flags:mopt, fd:fd, off:off -> byte#)
/* time - doublecheck if this is right */
const clock_getres : (clk : clock, ts : timespec# -> int32)
const clock_gettime : (clk : clock, ts : timespec# -> int32)
const clock_settime : (clk : clock, ts : timespec# -> int32)
const sleep : (time : uint64 -> int32)
const nanosleep : (req : timespec#, rem : timespec# -> int32)
/* system information */
const uname : (buf : utsname# -> int)
const sysctl : (mib : int[:], old : byte[:]#, new : byte[:] -> int)
/* filled by start code */
extern const __cenvp : byte##
extern const __environment : byte[:][:]
;;