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//go:build 386 && linux 6// +build 386,linux 7 8package unix 9 10import ( 11 "unsafe" 12) 13 14func setTimespec(sec, nsec int64) Timespec { 15 return Timespec{Sec: int32(sec), Nsec: int32(nsec)} 16} 17 18func setTimeval(sec, usec int64) Timeval { 19 return Timeval{Sec: int32(sec), Usec: int32(usec)} 20} 21 22// 64-bit file system and 32-bit uid calls 23// (386 default is 32-bit file system and 16-bit uid). 24//sys dup2(oldfd int, newfd int) (err error) 25//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) 26//sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64 27//sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32 28//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 29//sys Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64 30//sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 31//sysnb Getegid() (egid int) = SYS_GETEGID32 32//sysnb Geteuid() (euid int) = SYS_GETEUID32 33//sysnb Getgid() (gid int) = SYS_GETGID32 34//sysnb Getuid() (uid int) = SYS_GETUID32 35//sys Ioperm(from int, num int, on int) (err error) 36//sys Iopl(level int) (err error) 37//sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32 38//sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 39//sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 40//sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 41//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 42//sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 43//sys setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32 44//sys setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32 45//sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32 46//sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32 47//sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32 48//sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32 49//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 50//sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 51//sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) 52//sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 53//sys Ustat(dev int, ubuf *Ustat_t) (err error) 54//sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 55//sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32 56//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT 57 58//sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) 59//sys Pause() (err error) 60 61func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 62 page := uintptr(offset / 4096) 63 if offset != int64(page)*4096 { 64 return 0, EINVAL 65 } 66 return mmap2(addr, length, prot, flags, fd, page) 67} 68 69type rlimit32 struct { 70 Cur uint32 71 Max uint32 72} 73 74//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT 75 76const rlimInf32 = ^uint32(0) 77const rlimInf64 = ^uint64(0) 78 79func Getrlimit(resource int, rlim *Rlimit) (err error) { 80 err = Prlimit(0, resource, nil, rlim) 81 if err != ENOSYS { 82 return err 83 } 84 85 rl := rlimit32{} 86 err = getrlimit(resource, &rl) 87 if err != nil { 88 return 89 } 90 91 if rl.Cur == rlimInf32 { 92 rlim.Cur = rlimInf64 93 } else { 94 rlim.Cur = uint64(rl.Cur) 95 } 96 97 if rl.Max == rlimInf32 { 98 rlim.Max = rlimInf64 99 } else { 100 rlim.Max = uint64(rl.Max) 101 } 102 return 103} 104 105//sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT 106 107func Setrlimit(resource int, rlim *Rlimit) (err error) { 108 err = Prlimit(0, resource, rlim, nil) 109 if err != ENOSYS { 110 return err 111 } 112 113 rl := rlimit32{} 114 if rlim.Cur == rlimInf64 { 115 rl.Cur = rlimInf32 116 } else if rlim.Cur < uint64(rlimInf32) { 117 rl.Cur = uint32(rlim.Cur) 118 } else { 119 return EINVAL 120 } 121 if rlim.Max == rlimInf64 { 122 rl.Max = rlimInf32 123 } else if rlim.Max < uint64(rlimInf32) { 124 rl.Max = uint32(rlim.Max) 125 } else { 126 return EINVAL 127 } 128 129 return setrlimit(resource, &rl) 130} 131 132func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { 133 newoffset, errno := seek(fd, offset, whence) 134 if errno != 0 { 135 return 0, errno 136 } 137 return newoffset, nil 138} 139 140//sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) 141//sysnb Gettimeofday(tv *Timeval) (err error) 142//sysnb Time(t *Time_t) (tt Time_t, err error) 143//sys Utime(path string, buf *Utimbuf) (err error) 144//sys utimes(path string, times *[2]Timeval) (err error) 145 146// On x86 Linux, all the socket calls go through an extra indirection, 147// I think because the 5-register system call interface can't handle 148// the 6-argument calls like sendto and recvfrom. Instead the 149// arguments to the underlying system call are the number below 150// and a pointer to an array of uintptr. We hide the pointer in the 151// socketcall assembly to avoid allocation on every system call. 152 153const ( 154 // see linux/net.h 155 _SOCKET = 1 156 _BIND = 2 157 _CONNECT = 3 158 _LISTEN = 4 159 _ACCEPT = 5 160 _GETSOCKNAME = 6 161 _GETPEERNAME = 7 162 _SOCKETPAIR = 8 163 _SEND = 9 164 _RECV = 10 165 _SENDTO = 11 166 _RECVFROM = 12 167 _SHUTDOWN = 13 168 _SETSOCKOPT = 14 169 _GETSOCKOPT = 15 170 _SENDMSG = 16 171 _RECVMSG = 17 172 _ACCEPT4 = 18 173 _RECVMMSG = 19 174 _SENDMMSG = 20 175) 176 177func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) { 178 fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 179 if e != 0 { 180 err = e 181 } 182 return 183} 184 185func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { 186 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) 187 if e != 0 { 188 err = e 189 } 190 return 191} 192 193func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 194 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 195 if e != 0 { 196 err = e 197 } 198 return 199} 200 201func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 202 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 203 if e != 0 { 204 err = e 205 } 206 return 207} 208 209func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { 210 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) 211 if e != 0 { 212 err = e 213 } 214 return 215} 216 217func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 218 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 219 if e != 0 { 220 err = e 221 } 222 return 223} 224 225func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 226 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 227 if e != 0 { 228 err = e 229 } 230 return 231} 232 233func socket(domain int, typ int, proto int) (fd int, err error) { 234 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) 235 if e != 0 { 236 err = e 237 } 238 return 239} 240 241func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { 242 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) 243 if e != 0 { 244 err = e 245 } 246 return 247} 248 249func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { 250 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) 251 if e != 0 { 252 err = e 253 } 254 return 255} 256 257func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { 258 var base uintptr 259 if len(p) > 0 { 260 base = uintptr(unsafe.Pointer(&p[0])) 261 } 262 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) 263 if e != 0 { 264 err = e 265 } 266 return 267} 268 269func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { 270 var base uintptr 271 if len(p) > 0 { 272 base = uintptr(unsafe.Pointer(&p[0])) 273 } 274 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) 275 if e != 0 { 276 err = e 277 } 278 return 279} 280 281func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { 282 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 283 if e != 0 { 284 err = e 285 } 286 return 287} 288 289func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { 290 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 291 if e != 0 { 292 err = e 293 } 294 return 295} 296 297func Listen(s int, n int) (err error) { 298 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) 299 if e != 0 { 300 err = e 301 } 302 return 303} 304 305func Shutdown(s, how int) (err error) { 306 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) 307 if e != 0 { 308 err = e 309 } 310 return 311} 312 313func Fstatfs(fd int, buf *Statfs_t) (err error) { 314 _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 315 if e != 0 { 316 err = e 317 } 318 return 319} 320 321func Statfs(path string, buf *Statfs_t) (err error) { 322 pathp, err := BytePtrFromString(path) 323 if err != nil { 324 return err 325 } 326 _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 327 if e != 0 { 328 err = e 329 } 330 return 331} 332 333func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) } 334 335func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) } 336 337func (iov *Iovec) SetLen(length int) { 338 iov.Len = uint32(length) 339} 340 341func (msghdr *Msghdr) SetControllen(length int) { 342 msghdr.Controllen = uint32(length) 343} 344 345func (msghdr *Msghdr) SetIovlen(length int) { 346 msghdr.Iovlen = uint32(length) 347} 348 349func (cmsg *Cmsghdr) SetLen(length int) { 350 cmsg.Len = uint32(length) 351} 352 353func (rsa *RawSockaddrNFCLLCP) SetServiceNameLen(length int) { 354 rsa.Service_name_len = uint32(length) 355} 356 357//sys poll(fds *PollFd, nfds int, timeout int) (n int, err error) 358 359func Poll(fds []PollFd, timeout int) (n int, err error) { 360 if len(fds) == 0 { 361 return poll(nil, 0, timeout) 362 } 363 return poll(&fds[0], len(fds), timeout) 364} 365