syscall_linux_386.go (9022B)
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 7 package unix 8 9 import ( 10 "unsafe" 11 ) 12 13 func setTimespec(sec, nsec int64) Timespec { 14 return Timespec{Sec: int32(sec), Nsec: int32(nsec)} 15 } 16 17 func setTimeval(sec, usec int64) Timeval { 18 return Timeval{Sec: int32(sec), Usec: int32(usec)} 19 } 20 21 // 64-bit file system and 32-bit uid calls 22 // (386 default is 32-bit file system and 16-bit uid). 23 //sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64 24 //sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32 25 //sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 26 //sys Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64 27 //sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 28 //sysnb Getegid() (egid int) = SYS_GETEGID32 29 //sysnb Geteuid() (euid int) = SYS_GETEUID32 30 //sysnb Getgid() (gid int) = SYS_GETGID32 31 //sysnb Getuid() (uid int) = SYS_GETUID32 32 //sys Ioperm(from int, num int, on int) (err error) 33 //sys Iopl(level int) (err error) 34 //sys Lchown(path string, uid int, gid int) (err error) = SYS_LCHOWN32 35 //sys Lstat(path string, stat *Stat_t) (err error) = SYS_LSTAT64 36 //sys pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 37 //sys pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 38 //sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 39 //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 40 //sys setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32 41 //sys setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32 42 //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 43 //sys Stat(path string, stat *Stat_t) (err error) = SYS_STAT64 44 //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) 45 //sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 46 //sys Ustat(dev int, ubuf *Ustat_t) (err error) 47 //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 48 //sysnb setgroups(n int, list *_Gid_t) (err error) = SYS_SETGROUPS32 49 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT 50 51 //sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) 52 //sys Pause() (err error) 53 54 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 55 page := uintptr(offset / 4096) 56 if offset != int64(page)*4096 { 57 return 0, EINVAL 58 } 59 return mmap2(addr, length, prot, flags, fd, page) 60 } 61 62 type rlimit32 struct { 63 Cur uint32 64 Max uint32 65 } 66 67 //sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT 68 69 const rlimInf32 = ^uint32(0) 70 const rlimInf64 = ^uint64(0) 71 72 func Getrlimit(resource int, rlim *Rlimit) (err error) { 73 err = Prlimit(0, resource, nil, rlim) 74 if err != ENOSYS { 75 return err 76 } 77 78 rl := rlimit32{} 79 err = getrlimit(resource, &rl) 80 if err != nil { 81 return 82 } 83 84 if rl.Cur == rlimInf32 { 85 rlim.Cur = rlimInf64 86 } else { 87 rlim.Cur = uint64(rl.Cur) 88 } 89 90 if rl.Max == rlimInf32 { 91 rlim.Max = rlimInf64 92 } else { 93 rlim.Max = uint64(rl.Max) 94 } 95 return 96 } 97 98 func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { 99 newoffset, errno := seek(fd, offset, whence) 100 if errno != 0 { 101 return 0, errno 102 } 103 return newoffset, nil 104 } 105 106 //sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) 107 //sysnb Gettimeofday(tv *Timeval) (err error) 108 //sysnb Time(t *Time_t) (tt Time_t, err error) 109 //sys Utime(path string, buf *Utimbuf) (err error) 110 //sys utimes(path string, times *[2]Timeval) (err error) 111 112 // On x86 Linux, all the socket calls go through an extra indirection, 113 // I think because the 5-register system call interface can't handle 114 // the 6-argument calls like sendto and recvfrom. Instead the 115 // arguments to the underlying system call are the number below 116 // and a pointer to an array of uintptr. We hide the pointer in the 117 // socketcall assembly to avoid allocation on every system call. 118 119 const ( 120 // see linux/net.h 121 _SOCKET = 1 122 _BIND = 2 123 _CONNECT = 3 124 _LISTEN = 4 125 _ACCEPT = 5 126 _GETSOCKNAME = 6 127 _GETPEERNAME = 7 128 _SOCKETPAIR = 8 129 _SEND = 9 130 _RECV = 10 131 _SENDTO = 11 132 _RECVFROM = 12 133 _SHUTDOWN = 13 134 _SETSOCKOPT = 14 135 _GETSOCKOPT = 15 136 _SENDMSG = 16 137 _RECVMSG = 17 138 _ACCEPT4 = 18 139 _RECVMMSG = 19 140 _SENDMMSG = 20 141 ) 142 143 func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { 144 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) 145 if e != 0 { 146 err = e 147 } 148 return 149 } 150 151 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 152 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 153 if e != 0 { 154 err = e 155 } 156 return 157 } 158 159 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 160 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 161 if e != 0 { 162 err = e 163 } 164 return 165 } 166 167 func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { 168 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) 169 if e != 0 { 170 err = e 171 } 172 return 173 } 174 175 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 176 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 177 if e != 0 { 178 err = e 179 } 180 return 181 } 182 183 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 184 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 185 if e != 0 { 186 err = e 187 } 188 return 189 } 190 191 func socket(domain int, typ int, proto int) (fd int, err error) { 192 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) 193 if e != 0 { 194 err = e 195 } 196 return 197 } 198 199 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { 200 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) 201 if e != 0 { 202 err = e 203 } 204 return 205 } 206 207 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { 208 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) 209 if e != 0 { 210 err = e 211 } 212 return 213 } 214 215 func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { 216 var base uintptr 217 if len(p) > 0 { 218 base = uintptr(unsafe.Pointer(&p[0])) 219 } 220 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) 221 if e != 0 { 222 err = e 223 } 224 return 225 } 226 227 func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { 228 var base uintptr 229 if len(p) > 0 { 230 base = uintptr(unsafe.Pointer(&p[0])) 231 } 232 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) 233 if e != 0 { 234 err = e 235 } 236 return 237 } 238 239 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { 240 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 241 if e != 0 { 242 err = e 243 } 244 return 245 } 246 247 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { 248 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 249 if e != 0 { 250 err = e 251 } 252 return 253 } 254 255 func Listen(s int, n int) (err error) { 256 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) 257 if e != 0 { 258 err = e 259 } 260 return 261 } 262 263 func Shutdown(s, how int) (err error) { 264 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) 265 if e != 0 { 266 err = e 267 } 268 return 269 } 270 271 func Fstatfs(fd int, buf *Statfs_t) (err error) { 272 _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 273 if e != 0 { 274 err = e 275 } 276 return 277 } 278 279 func Statfs(path string, buf *Statfs_t) (err error) { 280 pathp, err := BytePtrFromString(path) 281 if err != nil { 282 return err 283 } 284 _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 285 if e != 0 { 286 err = e 287 } 288 return 289 } 290 291 func (r *PtraceRegs) PC() uint64 { return uint64(uint32(r.Eip)) } 292 293 func (r *PtraceRegs) SetPC(pc uint64) { r.Eip = int32(pc) } 294 295 func (iov *Iovec) SetLen(length int) { 296 iov.Len = uint32(length) 297 } 298 299 func (msghdr *Msghdr) SetControllen(length int) { 300 msghdr.Controllen = uint32(length) 301 } 302 303 func (msghdr *Msghdr) SetIovlen(length int) { 304 msghdr.Iovlen = uint32(length) 305 } 306 307 func (cmsg *Cmsghdr) SetLen(length int) { 308 cmsg.Len = uint32(length) 309 } 310 311 func (rsa *RawSockaddrNFCLLCP) SetServiceNameLen(length int) { 312 rsa.Service_name_len = uint32(length) 313 }