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 sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 72 //sys Setfsgid(gid int) (err error) = SYS_SETFSGID32 73 //sys Setfsuid(uid int) (err error) = SYS_SETFSUID32 74 //sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32 75 //sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32 76 //sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32 77 //sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32 78 //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 79 //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 80 //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) 81 //sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 82 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 83 //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 84 //sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32 85 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT 86 87 //sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) 88 //sys Pause() (err error) 89 90 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 91 page := uintptr(offset / 4096) 92 if offset != int64(page)*4096 { 93 return 0, EINVAL 94 } 95 return mmap2(addr, length, prot, flags, fd, page) 96 } 97 98 type rlimit32 struct { 99 Cur uint32 100 Max uint32 101 } 102 103 //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT 104 105 const rlimInf32 = ^uint32(0) 106 const rlimInf64 = ^uint64(0) 107 108 func Getrlimit(resource int, rlim *Rlimit) (err error) { 109 err = prlimit(0, resource, nil, rlim) 110 if err != ENOSYS { 111 return err 112 } 113 114 rl := rlimit32{} 115 err = getrlimit(resource, &rl) 116 if err != nil { 117 return 118 } 119 120 if rl.Cur == rlimInf32 { 121 rlim.Cur = rlimInf64 122 } else { 123 rlim.Cur = uint64(rl.Cur) 124 } 125 126 if rl.Max == rlimInf32 { 127 rlim.Max = rlimInf64 128 } else { 129 rlim.Max = uint64(rl.Max) 130 } 131 return 132 } 133 134 //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT 135 136 func Setrlimit(resource int, rlim *Rlimit) (err error) { 137 err = prlimit(0, resource, rlim, nil) 138 if err != ENOSYS { 139 return err 140 } 141 142 rl := rlimit32{} 143 if rlim.Cur == rlimInf64 { 144 rl.Cur = rlimInf32 145 } else if rlim.Cur < uint64(rlimInf32) { 146 rl.Cur = uint32(rlim.Cur) 147 } else { 148 return EINVAL 149 } 150 if rlim.Max == rlimInf64 { 151 rl.Max = rlimInf32 152 } else if rlim.Max < uint64(rlimInf32) { 153 rl.Max = uint32(rlim.Max) 154 } else { 155 return EINVAL 156 } 157 158 return setrlimit(resource, &rl) 159 } 160 161 func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { 162 newoffset, errno := seek(fd, offset, whence) 163 if errno != 0 { 164 return 0, errno 165 } 166 return newoffset, nil 167 } 168 169 //sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) 170 //sysnb Gettimeofday(tv *Timeval) (err error) 171 //sysnb Time(t *Time_t) (tt Time_t, err error) 172 //sys Utime(path string, buf *Utimbuf) (err error) 173 //sys utimes(path string, times *[2]Timeval) (err error) 174 175 // On x86 Linux, all the socket calls go through an extra indirection, 176 // I think because the 5-register system call interface can't handle 177 // the 6-argument calls like sendto and recvfrom. Instead the 178 // arguments to the underlying system call are the number below 179 // and a pointer to an array of uintptr. We hide the pointer in the 180 // socketcall assembly to avoid allocation on every system call. 181 182 const ( 183 // see linux/net.h 184 _SOCKET = 1 185 _BIND = 2 186 _CONNECT = 3 187 _LISTEN = 4 188 _ACCEPT = 5 189 _GETSOCKNAME = 6 190 _GETPEERNAME = 7 191 _SOCKETPAIR = 8 192 _SEND = 9 193 _RECV = 10 194 _SENDTO = 11 195 _RECVFROM = 12 196 _SHUTDOWN = 13 197 _SETSOCKOPT = 14 198 _GETSOCKOPT = 15 199 _SENDMSG = 16 200 _RECVMSG = 17 201 _ACCEPT4 = 18 202 _RECVMMSG = 19 203 _SENDMMSG = 20 204 ) 205 206 func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) { 207 fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 208 if e != 0 { 209 err = e 210 } 211 return 212 } 213 214 func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { 215 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) 216 if e != 0 { 217 err = e 218 } 219 return 220 } 221 222 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 223 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 224 if e != 0 { 225 err = e 226 } 227 return 228 } 229 230 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 231 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 232 if e != 0 { 233 err = e 234 } 235 return 236 } 237 238 func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { 239 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) 240 if e != 0 { 241 err = e 242 } 243 return 244 } 245 246 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 247 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 248 if e != 0 { 249 err = e 250 } 251 return 252 } 253 254 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 255 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 256 if e != 0 { 257 err = e 258 } 259 return 260 } 261 262 func socket(domain int, typ int, proto int) (fd int, err error) { 263 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) 264 if e != 0 { 265 err = e 266 } 267 return 268 } 269 270 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { 271 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) 272 if e != 0 { 273 err = e 274 } 275 return 276 } 277 278 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { 279 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) 280 if e != 0 { 281 err = e 282 } 283 return 284 } 285 286 func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { 287 var base uintptr 288 if len(p) > 0 { 289 base = uintptr(unsafe.Pointer(&p[0])) 290 } 291 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) 292 if e != 0 { 293 err = e 294 } 295 return 296 } 297 298 func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { 299 var base uintptr 300 if len(p) > 0 { 301 base = uintptr(unsafe.Pointer(&p[0])) 302 } 303 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) 304 if e != 0 { 305 err = e 306 } 307 return 308 } 309 310 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { 311 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 312 if e != 0 { 313 err = e 314 } 315 return 316 } 317 318 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { 319 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 320 if e != 0 { 321 err = e 322 } 323 return 324 } 325 326 func Listen(s int, n int) (err error) { 327 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) 328 if e != 0 { 329 err = e 330 } 331 return 332 } 333 334 func Shutdown(s, how int) (err error) { 335 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) 336 if e != 0 { 337 err = e 338 } 339 return 340 } 341 342 func Fstatfs(fd int, buf *Statfs_t) (err error) { 343 _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 344 if e != 0 { 345 err = e 346 } 347 return 348 } 349 350 func Statfs(path string, buf *Statfs_t) (err error) { 351 pathp, err := BytePtrFromString(path) 352 if err != nil { 353 return err 354 } 355 _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 356 if e != 0 { 357 err = e 358 } 359 return 360 } 361 362 func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) } 363 364 func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) } 365 366 func (iov *Iovec) SetLen(length int) { 367 iov.Len = uint32(length) 368 } 369 370 func (msghdr *Msghdr) SetControllen(length int) { 371 msghdr.Controllen = uint32(length) 372 } 373 374 func (cmsg *Cmsghdr) SetLen(length int) { 375 cmsg.Len = uint32(length) 376 } 377 378 //sys poll(fds *PollFd, nfds int, timeout int) (n int, err error) 379 380 func Poll(fds []PollFd, timeout int) (n int, err error) { 381 if len(fds) == 0 { 382 return poll(nil, 0, timeout) 383 } 384 return poll(&fds[0], len(fds), timeout) 385 } 386
