Dinesh Belwalkar | e63f7f9 | 2019-11-22 23:11:16 +0000 | [diff] [blame^] | 1 | // Copyright 2009 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP) |
| 6 | // so that go vet can check that they are correct. |
| 7 | |
| 8 | // +build 386,linux |
| 9 | |
| 10 | package unix |
| 11 | |
| 12 | import ( |
| 13 | "unsafe" |
| 14 | ) |
| 15 | |
| 16 | func setTimespec(sec, nsec int64) Timespec { |
| 17 | return Timespec{Sec: int32(sec), Nsec: int32(nsec)} |
| 18 | } |
| 19 | |
| 20 | func setTimeval(sec, usec int64) Timeval { |
| 21 | return Timeval{Sec: int32(sec), Usec: int32(usec)} |
| 22 | } |
| 23 | |
| 24 | //sysnb pipe(p *[2]_C_int) (err error) |
| 25 | |
| 26 | func Pipe(p []int) (err error) { |
| 27 | if len(p) != 2 { |
| 28 | return EINVAL |
| 29 | } |
| 30 | var pp [2]_C_int |
| 31 | err = pipe(&pp) |
| 32 | p[0] = int(pp[0]) |
| 33 | p[1] = int(pp[1]) |
| 34 | return |
| 35 | } |
| 36 | |
| 37 | //sysnb pipe2(p *[2]_C_int, flags int) (err error) |
| 38 | |
| 39 | func Pipe2(p []int, flags int) (err error) { |
| 40 | if len(p) != 2 { |
| 41 | return EINVAL |
| 42 | } |
| 43 | var pp [2]_C_int |
| 44 | err = pipe2(&pp, flags) |
| 45 | p[0] = int(pp[0]) |
| 46 | p[1] = int(pp[1]) |
| 47 | return |
| 48 | } |
| 49 | |
| 50 | // 64-bit file system and 32-bit uid calls |
| 51 | // (386 default is 32-bit file system and 16-bit uid). |
| 52 | //sys Dup2(oldfd int, newfd int) (err error) |
| 53 | //sysnb EpollCreate(size int) (fd int, err error) |
| 54 | //sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) |
| 55 | //sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64 |
| 56 | //sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32 |
| 57 | //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 |
| 58 | //sys Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64 |
| 59 | //sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 |
| 60 | //sysnb Getegid() (egid int) = SYS_GETEGID32 |
| 61 | //sysnb Geteuid() (euid int) = SYS_GETEUID32 |
| 62 | //sysnb Getgid() (gid int) = SYS_GETGID32 |
| 63 | //sysnb Getuid() (uid int) = SYS_GETUID32 |
| 64 | //sysnb InotifyInit() (fd int, err error) |
| 65 | //sys Ioperm(from int, num int, on int) (err error) |
| 66 | //sys Iopl(level int) (err error) |
| 67 | //sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32 |
| 68 | //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 |
| 69 | //sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 |
| 70 | //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 |
| 71 | //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) |
| 72 | //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 |
| 73 | //sys Setfsgid(gid int) (err error) = SYS_SETFSGID32 |
| 74 | //sys Setfsuid(uid int) (err error) = SYS_SETFSUID32 |
| 75 | //sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32 |
| 76 | //sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32 |
| 77 | //sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32 |
| 78 | //sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32 |
| 79 | //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) |
| 80 | //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 |
| 81 | //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) |
| 82 | //sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 |
| 83 | //sys Ustat(dev int, ubuf *Ustat_t) (err error) |
| 84 | //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 |
| 85 | //sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32 |
| 86 | //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT |
| 87 | |
| 88 | //sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) |
| 89 | //sys Pause() (err error) |
| 90 | |
| 91 | func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { |
| 92 | page := uintptr(offset / 4096) |
| 93 | if offset != int64(page)*4096 { |
| 94 | return 0, EINVAL |
| 95 | } |
| 96 | return mmap2(addr, length, prot, flags, fd, page) |
| 97 | } |
| 98 | |
| 99 | type rlimit32 struct { |
| 100 | Cur uint32 |
| 101 | Max uint32 |
| 102 | } |
| 103 | |
| 104 | //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT |
| 105 | |
| 106 | const rlimInf32 = ^uint32(0) |
| 107 | const rlimInf64 = ^uint64(0) |
| 108 | |
| 109 | func Getrlimit(resource int, rlim *Rlimit) (err error) { |
| 110 | err = prlimit(0, resource, nil, rlim) |
| 111 | if err != ENOSYS { |
| 112 | return err |
| 113 | } |
| 114 | |
| 115 | rl := rlimit32{} |
| 116 | err = getrlimit(resource, &rl) |
| 117 | if err != nil { |
| 118 | return |
| 119 | } |
| 120 | |
| 121 | if rl.Cur == rlimInf32 { |
| 122 | rlim.Cur = rlimInf64 |
| 123 | } else { |
| 124 | rlim.Cur = uint64(rl.Cur) |
| 125 | } |
| 126 | |
| 127 | if rl.Max == rlimInf32 { |
| 128 | rlim.Max = rlimInf64 |
| 129 | } else { |
| 130 | rlim.Max = uint64(rl.Max) |
| 131 | } |
| 132 | return |
| 133 | } |
| 134 | |
| 135 | //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT |
| 136 | |
| 137 | func Setrlimit(resource int, rlim *Rlimit) (err error) { |
| 138 | err = prlimit(0, resource, rlim, nil) |
| 139 | if err != ENOSYS { |
| 140 | return err |
| 141 | } |
| 142 | |
| 143 | rl := rlimit32{} |
| 144 | if rlim.Cur == rlimInf64 { |
| 145 | rl.Cur = rlimInf32 |
| 146 | } else if rlim.Cur < uint64(rlimInf32) { |
| 147 | rl.Cur = uint32(rlim.Cur) |
| 148 | } else { |
| 149 | return EINVAL |
| 150 | } |
| 151 | if rlim.Max == rlimInf64 { |
| 152 | rl.Max = rlimInf32 |
| 153 | } else if rlim.Max < uint64(rlimInf32) { |
| 154 | rl.Max = uint32(rlim.Max) |
| 155 | } else { |
| 156 | return EINVAL |
| 157 | } |
| 158 | |
| 159 | return setrlimit(resource, &rl) |
| 160 | } |
| 161 | |
| 162 | func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { |
| 163 | newoffset, errno := seek(fd, offset, whence) |
| 164 | if errno != 0 { |
| 165 | return 0, errno |
| 166 | } |
| 167 | return newoffset, nil |
| 168 | } |
| 169 | |
| 170 | //sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) |
| 171 | //sysnb Gettimeofday(tv *Timeval) (err error) |
| 172 | //sysnb Time(t *Time_t) (tt Time_t, err error) |
| 173 | //sys Utime(path string, buf *Utimbuf) (err error) |
| 174 | //sys utimes(path string, times *[2]Timeval) (err error) |
| 175 | |
| 176 | // On x86 Linux, all the socket calls go through an extra indirection, |
| 177 | // I think because the 5-register system call interface can't handle |
| 178 | // the 6-argument calls like sendto and recvfrom. Instead the |
| 179 | // arguments to the underlying system call are the number below |
| 180 | // and a pointer to an array of uintptr. We hide the pointer in the |
| 181 | // socketcall assembly to avoid allocation on every system call. |
| 182 | |
| 183 | const ( |
| 184 | // see linux/net.h |
| 185 | _SOCKET = 1 |
| 186 | _BIND = 2 |
| 187 | _CONNECT = 3 |
| 188 | _LISTEN = 4 |
| 189 | _ACCEPT = 5 |
| 190 | _GETSOCKNAME = 6 |
| 191 | _GETPEERNAME = 7 |
| 192 | _SOCKETPAIR = 8 |
| 193 | _SEND = 9 |
| 194 | _RECV = 10 |
| 195 | _SENDTO = 11 |
| 196 | _RECVFROM = 12 |
| 197 | _SHUTDOWN = 13 |
| 198 | _SETSOCKOPT = 14 |
| 199 | _GETSOCKOPT = 15 |
| 200 | _SENDMSG = 16 |
| 201 | _RECVMSG = 17 |
| 202 | _ACCEPT4 = 18 |
| 203 | _RECVMMSG = 19 |
| 204 | _SENDMMSG = 20 |
| 205 | ) |
| 206 | |
| 207 | func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) { |
| 208 | fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) |
| 209 | if e != 0 { |
| 210 | err = e |
| 211 | } |
| 212 | return |
| 213 | } |
| 214 | |
| 215 | func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { |
| 216 | fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) |
| 217 | if e != 0 { |
| 218 | err = e |
| 219 | } |
| 220 | return |
| 221 | } |
| 222 | |
| 223 | func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { |
| 224 | _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) |
| 225 | if e != 0 { |
| 226 | err = e |
| 227 | } |
| 228 | return |
| 229 | } |
| 230 | |
| 231 | func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { |
| 232 | _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) |
| 233 | if e != 0 { |
| 234 | err = e |
| 235 | } |
| 236 | return |
| 237 | } |
| 238 | |
| 239 | func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { |
| 240 | _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) |
| 241 | if e != 0 { |
| 242 | err = e |
| 243 | } |
| 244 | return |
| 245 | } |
| 246 | |
| 247 | func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { |
| 248 | _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) |
| 249 | if e != 0 { |
| 250 | err = e |
| 251 | } |
| 252 | return |
| 253 | } |
| 254 | |
| 255 | func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { |
| 256 | _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) |
| 257 | if e != 0 { |
| 258 | err = e |
| 259 | } |
| 260 | return |
| 261 | } |
| 262 | |
| 263 | func socket(domain int, typ int, proto int) (fd int, err error) { |
| 264 | fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) |
| 265 | if e != 0 { |
| 266 | err = e |
| 267 | } |
| 268 | return |
| 269 | } |
| 270 | |
| 271 | func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { |
| 272 | _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) |
| 273 | if e != 0 { |
| 274 | err = e |
| 275 | } |
| 276 | return |
| 277 | } |
| 278 | |
| 279 | func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { |
| 280 | _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) |
| 281 | if e != 0 { |
| 282 | err = e |
| 283 | } |
| 284 | return |
| 285 | } |
| 286 | |
| 287 | func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { |
| 288 | var base uintptr |
| 289 | if len(p) > 0 { |
| 290 | base = uintptr(unsafe.Pointer(&p[0])) |
| 291 | } |
| 292 | n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) |
| 293 | if e != 0 { |
| 294 | err = e |
| 295 | } |
| 296 | return |
| 297 | } |
| 298 | |
| 299 | func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { |
| 300 | var base uintptr |
| 301 | if len(p) > 0 { |
| 302 | base = uintptr(unsafe.Pointer(&p[0])) |
| 303 | } |
| 304 | _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) |
| 305 | if e != 0 { |
| 306 | err = e |
| 307 | } |
| 308 | return |
| 309 | } |
| 310 | |
| 311 | func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { |
| 312 | n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) |
| 313 | if e != 0 { |
| 314 | err = e |
| 315 | } |
| 316 | return |
| 317 | } |
| 318 | |
| 319 | func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { |
| 320 | n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) |
| 321 | if e != 0 { |
| 322 | err = e |
| 323 | } |
| 324 | return |
| 325 | } |
| 326 | |
| 327 | func Listen(s int, n int) (err error) { |
| 328 | _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) |
| 329 | if e != 0 { |
| 330 | err = e |
| 331 | } |
| 332 | return |
| 333 | } |
| 334 | |
| 335 | func Shutdown(s, how int) (err error) { |
| 336 | _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) |
| 337 | if e != 0 { |
| 338 | err = e |
| 339 | } |
| 340 | return |
| 341 | } |
| 342 | |
| 343 | func Fstatfs(fd int, buf *Statfs_t) (err error) { |
| 344 | _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) |
| 345 | if e != 0 { |
| 346 | err = e |
| 347 | } |
| 348 | return |
| 349 | } |
| 350 | |
| 351 | func Statfs(path string, buf *Statfs_t) (err error) { |
| 352 | pathp, err := BytePtrFromString(path) |
| 353 | if err != nil { |
| 354 | return err |
| 355 | } |
| 356 | _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) |
| 357 | if e != 0 { |
| 358 | err = e |
| 359 | } |
| 360 | return |
| 361 | } |
| 362 | |
| 363 | func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) } |
| 364 | |
| 365 | func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) } |
| 366 | |
| 367 | func (iov *Iovec) SetLen(length int) { |
| 368 | iov.Len = uint32(length) |
| 369 | } |
| 370 | |
| 371 | func (msghdr *Msghdr) SetControllen(length int) { |
| 372 | msghdr.Controllen = uint32(length) |
| 373 | } |
| 374 | |
| 375 | func (cmsg *Cmsghdr) SetLen(length int) { |
| 376 | cmsg.Len = uint32(length) |
| 377 | } |
| 378 | |
| 379 | //sys poll(fds *PollFd, nfds int, timeout int) (n int, err error) |
| 380 | |
| 381 | func Poll(fds []PollFd, timeout int) (n int, err error) { |
| 382 | if len(fds) == 0 { |
| 383 | return poll(nil, 0, timeout) |
| 384 | } |
| 385 | return poll(&fds[0], len(fds), timeout) |
| 386 | } |