syscall_linux_386.go (9967B)
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 8 package unix 9 10 import ( 11 "unsafe" 12 ) 13 14 func setTimespec(sec, nsec int64) Timespec { 15 return Timespec{Sec: int32(sec), Nsec: int32(nsec)} 16 } 17 18 func 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 EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) 25 //sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64 26 //sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32 27 //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 28 //sys Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64 29 //sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 30 //sysnb Getegid() (egid int) = SYS_GETEGID32 31 //sysnb Geteuid() (euid int) = SYS_GETEUID32 32 //sysnb Getgid() (gid int) = SYS_GETGID32 33 //sysnb Getuid() (uid int) = SYS_GETUID32 34 //sys Ioperm(from int, num int, on int) (err error) 35 //sys Iopl(level int) (err error) 36 //sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32 37 //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 38 //sys pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 39 //sys pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 40 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 41 //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 42 //sys setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32 43 //sys setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32 44 //sysnb Setregid(rgid int, egid int) (err error) = SYS_SETREGID32 45 //sysnb Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32 46 //sysnb Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32 47 //sysnb Setreuid(ruid int, euid int) (err error) = SYS_SETREUID32 48 //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 49 //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 50 //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) 51 //sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 52 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 53 //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 54 //sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32 55 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT 56 57 //sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) 58 //sys Pause() (err error) 59 60 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 61 page := uintptr(offset / 4096) 62 if offset != int64(page)*4096 { 63 return 0, EINVAL 64 } 65 return mmap2(addr, length, prot, flags, fd, page) 66 } 67 68 type rlimit32 struct { 69 Cur uint32 70 Max uint32 71 } 72 73 //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT 74 75 const rlimInf32 = ^uint32(0) 76 const rlimInf64 = ^uint64(0) 77 78 func Getrlimit(resource int, rlim *Rlimit) (err error) { 79 err = Prlimit(0, resource, nil, rlim) 80 if err != ENOSYS { 81 return err 82 } 83 84 rl := rlimit32{} 85 err = getrlimit(resource, &rl) 86 if err != nil { 87 return 88 } 89 90 if rl.Cur == rlimInf32 { 91 rlim.Cur = rlimInf64 92 } else { 93 rlim.Cur = uint64(rl.Cur) 94 } 95 96 if rl.Max == rlimInf32 { 97 rlim.Max = rlimInf64 98 } else { 99 rlim.Max = uint64(rl.Max) 100 } 101 return 102 } 103 104 //sysnb setrlimit(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT 105 106 func Setrlimit(resource int, rlim *Rlimit) (err error) { 107 err = Prlimit(0, resource, rlim, nil) 108 if err != ENOSYS { 109 return err 110 } 111 112 rl := rlimit32{} 113 if rlim.Cur == rlimInf64 { 114 rl.Cur = rlimInf32 115 } else if rlim.Cur < uint64(rlimInf32) { 116 rl.Cur = uint32(rlim.Cur) 117 } else { 118 return EINVAL 119 } 120 if rlim.Max == rlimInf64 { 121 rl.Max = rlimInf32 122 } else if rlim.Max < uint64(rlimInf32) { 123 rl.Max = uint32(rlim.Max) 124 } else { 125 return EINVAL 126 } 127 128 return setrlimit(resource, &rl) 129 } 130 131 func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { 132 newoffset, errno := seek(fd, offset, whence) 133 if errno != 0 { 134 return 0, errno 135 } 136 return newoffset, nil 137 } 138 139 //sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) 140 //sysnb Gettimeofday(tv *Timeval) (err error) 141 //sysnb Time(t *Time_t) (tt Time_t, err error) 142 //sys Utime(path string, buf *Utimbuf) (err error) 143 //sys utimes(path string, times *[2]Timeval) (err error) 144 145 // On x86 Linux, all the socket calls go through an extra indirection, 146 // I think because the 5-register system call interface can't handle 147 // the 6-argument calls like sendto and recvfrom. Instead the 148 // arguments to the underlying system call are the number below 149 // and a pointer to an array of uintptr. We hide the pointer in the 150 // socketcall assembly to avoid allocation on every system call. 151 152 const ( 153 // see linux/net.h 154 _SOCKET = 1 155 _BIND = 2 156 _CONNECT = 3 157 _LISTEN = 4 158 _ACCEPT = 5 159 _GETSOCKNAME = 6 160 _GETPEERNAME = 7 161 _SOCKETPAIR = 8 162 _SEND = 9 163 _RECV = 10 164 _SENDTO = 11 165 _RECVFROM = 12 166 _SHUTDOWN = 13 167 _SETSOCKOPT = 14 168 _GETSOCKOPT = 15 169 _SENDMSG = 16 170 _RECVMSG = 17 171 _ACCEPT4 = 18 172 _RECVMMSG = 19 173 _SENDMMSG = 20 174 ) 175 176 func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { 177 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) 178 if e != 0 { 179 err = e 180 } 181 return 182 } 183 184 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 185 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 186 if e != 0 { 187 err = e 188 } 189 return 190 } 191 192 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 193 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 194 if e != 0 { 195 err = e 196 } 197 return 198 } 199 200 func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { 201 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) 202 if e != 0 { 203 err = e 204 } 205 return 206 } 207 208 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 209 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 210 if e != 0 { 211 err = e 212 } 213 return 214 } 215 216 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 217 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 218 if e != 0 { 219 err = e 220 } 221 return 222 } 223 224 func socket(domain int, typ int, proto int) (fd int, err error) { 225 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) 226 if e != 0 { 227 err = e 228 } 229 return 230 } 231 232 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { 233 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) 234 if e != 0 { 235 err = e 236 } 237 return 238 } 239 240 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { 241 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) 242 if e != 0 { 243 err = e 244 } 245 return 246 } 247 248 func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { 249 var base uintptr 250 if len(p) > 0 { 251 base = uintptr(unsafe.Pointer(&p[0])) 252 } 253 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) 254 if e != 0 { 255 err = e 256 } 257 return 258 } 259 260 func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { 261 var base uintptr 262 if len(p) > 0 { 263 base = uintptr(unsafe.Pointer(&p[0])) 264 } 265 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) 266 if e != 0 { 267 err = e 268 } 269 return 270 } 271 272 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { 273 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 274 if e != 0 { 275 err = e 276 } 277 return 278 } 279 280 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { 281 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 282 if e != 0 { 283 err = e 284 } 285 return 286 } 287 288 func Listen(s int, n int) (err error) { 289 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) 290 if e != 0 { 291 err = e 292 } 293 return 294 } 295 296 func Shutdown(s, how int) (err error) { 297 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) 298 if e != 0 { 299 err = e 300 } 301 return 302 } 303 304 func Fstatfs(fd int, buf *Statfs_t) (err error) { 305 _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 306 if e != 0 { 307 err = e 308 } 309 return 310 } 311 312 func Statfs(path string, buf *Statfs_t) (err error) { 313 pathp, err := BytePtrFromString(path) 314 if err != nil { 315 return err 316 } 317 _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 318 if e != 0 { 319 err = e 320 } 321 return 322 } 323 324 func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) } 325 326 func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) } 327 328 func (iov *Iovec) SetLen(length int) { 329 iov.Len = uint32(length) 330 } 331 332 func (msghdr *Msghdr) SetControllen(length int) { 333 msghdr.Controllen = uint32(length) 334 } 335 336 func (msghdr *Msghdr) SetIovlen(length int) { 337 msghdr.Iovlen = uint32(length) 338 } 339 340 func (cmsg *Cmsghdr) SetLen(length int) { 341 cmsg.Len = uint32(length) 342 } 343 344 func (rsa *RawSockaddrNFCLLCP) SetServiceNameLen(length int) { 345 rsa.Service_name_len = uint32(length) 346 }