1 // Copyright 2016 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 package syscall 6 7 import "unsafe" 8 9 const ( 10 _SYS_dup = SYS_DUP2 11 _SYS_getdents = SYS_GETDENTS64 12 _SYS_setgroups = SYS_SETGROUPS 13 ) 14 15 //sys Dup2(oldfd int, newfd int) (err error) 16 //sys Fchown(fd int, uid int, gid int) (err error) 17 //sys Fstat(fd int, stat *Stat_t) (err error) 18 //sys Fstatfs(fd int, buf *Statfs_t) (err error) 19 //sys Ftruncate(fd int, length int64) (err error) 20 //sysnb Getegid() (egid int) 21 //sysnb Geteuid() (euid int) 22 //sysnb Getgid() (gid int) 23 //sysnb Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_GETRLIMIT 24 //sysnb Getuid() (uid int) 25 //sysnb InotifyInit() (fd int, err error) 26 //sys Lchown(path string, uid int, gid int) (err error) 27 //sys Lstat(path string, stat *Stat_t) (err error) 28 //sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 29 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 30 //sys Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK 31 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) 32 //sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) 33 //sys Setfsgid(gid int) (err error) 34 //sys Setfsuid(uid int) (err error) 35 //sysnb Setregid(rgid int, egid int) (err error) 36 //sysnb Setresgid(rgid int, egid int, sgid int) (err error) 37 //sysnb Setresuid(ruid int, euid int, suid int) (err error) 38 //sysnb Setrlimit(resource int, rlim *Rlimit) (err error) 39 //sysnb Setreuid(ruid int, euid int) (err error) 40 //sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error) 41 //sys Stat(path string, stat *Stat_t) (err error) 42 //sys Statfs(path string, buf *Statfs_t) (err error) 43 //sys SyncFileRange(fd int, off int64, n int64, flags int) (err error) = SYS_SYNC_FILE_RANGE 44 //sys Truncate(path string, length int64) (err error) 45 //sysnb getgroups(n int, list *_Gid_t) (nn int, err error) 46 //sysnb setgroups(n int, list *_Gid_t) (err error) 47 48 //sysnb Gettimeofday(tv *Timeval) (err error) 49 50 func Time(t *Time_t) (tt Time_t, err error) { 51 var tv Timeval 52 err = Gettimeofday(&tv) 53 if err != nil { 54 return 0, err 55 } 56 if t != nil { 57 *t = Time_t(tv.Sec) 58 } 59 return Time_t(tv.Sec), nil 60 } 61 62 func setTimespec(sec, nsec int64) Timespec { 63 return Timespec{Sec: sec, Nsec: nsec} 64 } 65 66 func setTimeval(sec, usec int64) Timeval { 67 return Timeval{Sec: sec, Usec: usec} 68 } 69 70 func Pipe(p []int) (err error) { 71 if len(p) != 2 { 72 return EINVAL 73 } 74 var pp [2]_C_int 75 err = pipe2(&pp, 0) 76 p[0] = int(pp[0]) 77 p[1] = int(pp[1]) 78 return 79 } 80 81 //sysnb pipe2(p *[2]_C_int, flags int) (err error) 82 83 func Pipe2(p []int, flags int) (err error) { 84 if len(p) != 2 { 85 return EINVAL 86 } 87 var pp [2]_C_int 88 err = pipe2(&pp, flags) 89 p[0] = int(pp[0]) 90 p[1] = int(pp[1]) 91 return 92 } 93 94 // Linux on s390x uses the old mmap interface, which requires arguments to be passed in a struct. 95 // mmap2 also requires arguments to be passed in a struct; it is currently not exposed in <asm/unistd.h>. 96 func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 97 mmap_args := [6]uintptr{addr, length, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(offset)} 98 r0, _, e1 := Syscall(SYS_MMAP, uintptr(unsafe.Pointer(&mmap_args[0])), 0, 0) 99 use(unsafe.Pointer(&mmap_args[0])) 100 xaddr = uintptr(r0) 101 if e1 != 0 { 102 err = errnoErr(e1) 103 } 104 return 105 } 106 107 // On s390x Linux, all the socket calls go through an extra indirection. 108 // The arguments to the underlying system call are the number below 109 // and a pointer to an array of uintptr. We hide the pointer in the 110 // socketcall assembly to avoid allocation on every system call. 111 112 const ( 113 // see linux/net.h 114 _SOCKET = 1 115 _BIND = 2 116 _CONNECT = 3 117 _LISTEN = 4 118 _ACCEPT = 5 119 _GETSOCKNAME = 6 120 _GETPEERNAME = 7 121 _SOCKETPAIR = 8 122 _SEND = 9 123 _RECV = 10 124 _SENDTO = 11 125 _RECVFROM = 12 126 _SHUTDOWN = 13 127 _SETSOCKOPT = 14 128 _GETSOCKOPT = 15 129 _SENDMSG = 16 130 _RECVMSG = 17 131 _ACCEPT4 = 18 132 _RECVMMSG = 19 133 _SENDMMSG = 20 134 ) 135 136 func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err Errno) 137 func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err Errno) 138 139 func accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) { 140 fd, e := socketcall(_ACCEPT, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 141 if e != 0 { 142 err = e 143 } 144 return 145 } 146 147 func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) { 148 fd, e := socketcall(_ACCEPT4, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), uintptr(flags), 0, 0) 149 if e != 0 { 150 err = e 151 } 152 return 153 } 154 155 func getsockname(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 156 _, e := rawsocketcall(_GETSOCKNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 157 if e != 0 { 158 err = e 159 } 160 return 161 } 162 163 func getpeername(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) { 164 _, e := rawsocketcall(_GETPEERNAME, uintptr(s), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0) 165 if e != 0 { 166 err = e 167 } 168 return 169 } 170 171 func socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) { 172 _, e := rawsocketcall(_SOCKETPAIR, uintptr(domain), uintptr(typ), uintptr(flags), uintptr(unsafe.Pointer(fd)), 0, 0) 173 if e != 0 { 174 err = e 175 } 176 return 177 } 178 179 func bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 180 _, e := socketcall(_BIND, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 181 if e != 0 { 182 err = e 183 } 184 return 185 } 186 187 func connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) { 188 _, e := socketcall(_CONNECT, uintptr(s), uintptr(addr), uintptr(addrlen), 0, 0, 0) 189 if e != 0 { 190 err = e 191 } 192 return 193 } 194 195 func socket(domain int, typ int, proto int) (fd int, err error) { 196 fd, e := rawsocketcall(_SOCKET, uintptr(domain), uintptr(typ), uintptr(proto), 0, 0, 0) 197 if e != 0 { 198 err = e 199 } 200 return 201 } 202 203 func getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) { 204 _, e := socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0) 205 if e != 0 { 206 err = e 207 } 208 return 209 } 210 211 func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) { 212 _, e := socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), vallen, 0) 213 if e != 0 { 214 err = e 215 } 216 return 217 } 218 219 func recvfrom(s int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) { 220 var base uintptr 221 if len(p) > 0 { 222 base = uintptr(unsafe.Pointer(&p[0])) 223 } 224 n, e := socketcall(_RECVFROM, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen))) 225 if e != 0 { 226 err = e 227 } 228 return 229 } 230 231 func sendto(s int, p []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) { 232 var base uintptr 233 if len(p) > 0 { 234 base = uintptr(unsafe.Pointer(&p[0])) 235 } 236 _, e := socketcall(_SENDTO, uintptr(s), base, uintptr(len(p)), uintptr(flags), uintptr(to), uintptr(addrlen)) 237 if e != 0 { 238 err = e 239 } 240 return 241 } 242 243 func recvmsg(s int, msg *Msghdr, flags int) (n int, err error) { 244 n, e := socketcall(_RECVMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 245 if e != 0 { 246 err = e 247 } 248 return 249 } 250 251 func sendmsg(s int, msg *Msghdr, flags int) (n int, err error) { 252 n, e := socketcall(_SENDMSG, uintptr(s), uintptr(unsafe.Pointer(msg)), uintptr(flags), 0, 0, 0) 253 if e != 0 { 254 err = e 255 } 256 return 257 } 258 259 func Listen(s int, n int) (err error) { 260 _, e := socketcall(_LISTEN, uintptr(s), uintptr(n), 0, 0, 0, 0) 261 if e != 0 { 262 err = e 263 } 264 return 265 } 266 267 func Shutdown(s, how int) (err error) { 268 _, e := socketcall(_SHUTDOWN, uintptr(s), uintptr(how), 0, 0, 0, 0) 269 if e != 0 { 270 err = e 271 } 272 return 273 } 274 275 func (r *PtraceRegs) PC() uint64 { return r.Psw.Addr } 276 277 func (r *PtraceRegs) SetPC(pc uint64) { r.Psw.Addr = pc } 278 279 func (iov *Iovec) SetLen(length int) { 280 iov.Len = uint64(length) 281 } 282 283 func (msghdr *Msghdr) SetControllen(length int) { 284 msghdr.Controllen = uint64(length) 285 } 286 287 func (cmsg *Cmsghdr) SetLen(length int) { 288 cmsg.Len = uint64(length) 289 } 290
