vendor/golang.org/x/sys/unix/syscall_linux_386.go

   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 }