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 5package syscall 6 7import "unsafe" 8 9const ( 10 _SYS_setgroups = SYS_SETGROUPS32 11 _SYS_clone3 = 435 12 _SYS_faccessat2 = 439 13 _SYS_fchmodat2 = 452 14) 15 16func setTimespec(sec, nsec int64) Timespec { 17 return Timespec{Sec: int32(sec), Nsec: int32(nsec)} 18} 19 20func setTimeval(sec, usec int64) Timeval { 21 return Timeval{Sec: int32(sec), Usec: int32(usec)} 22} 23 24// Underlying system call writes to newoffset via pointer. 25// Implemented in assembly to avoid allocation. 26func seek(fd int, offset int64, whence int) (newoffset int64, err Errno) 27 28func Seek(fd int, offset int64, whence int) (newoffset int64, err error) { 29 newoffset, errno := seek(fd, offset, whence) 30 if errno != 0 { 31 return 0, errno 32 } 33 return newoffset, nil 34} 35 36//sys accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) 37//sys bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) 38//sys connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) 39//sysnb getgroups(n int, list *_Gid_t) (nn int, err error) = SYS_GETGROUPS32 40//sys getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error) 41//sys setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) 42//sysnb socket(domain int, typ int, proto int) (fd int, err error) 43//sysnb getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) 44//sysnb getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) 45//sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) 46//sys sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) 47//sysnb socketpair(domain int, typ int, flags int, fd *[2]int32) (err error) 48//sys recvmsg(s int, msg *Msghdr, flags int) (n int, err error) 49//sys sendmsg(s int, msg *Msghdr, flags int) (n int, err error) 50 51// 64-bit file system and 32-bit uid calls 52// (16-bit uid calls are not always supported in newer kernels) 53//sys Dup2(oldfd int, newfd int) (err error) 54//sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32 55//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 56//sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64 57//sysnb Getegid() (egid int) = SYS_GETEGID32 58//sysnb Geteuid() (euid int) = SYS_GETEUID32 59//sysnb Getgid() (gid int) = SYS_GETGID32 60//sysnb Getuid() (uid int) = SYS_GETUID32 61//sysnb InotifyInit() (fd int, err error) 62//sys Listen(s int, n int) (err error) 63//sys Pause() (err error) 64//sys Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) 65//sys sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64 66//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT 67//sys Setfsgid(gid int) (err error) = SYS_SETFSGID32 68//sys Setfsuid(uid int) (err error) = SYS_SETFSUID32 69//sys Shutdown(fd int, how int) (err error) 70//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) 71//sys Ustat(dev int, ubuf *Ustat_t) (err error) 72 73//sys futimesat(dirfd int, path string, times *[2]Timeval) (err error) 74//sysnb Gettimeofday(tv *Timeval) (err error) 75//sysnb Time(t *Time_t) (tt Time_t, err error) 76//sys Utime(path string, buf *Utimbuf) (err error) 77//sys utimes(path string, times *[2]Timeval) (err error) 78 79//sys pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64 80//sys pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64 81//sys Truncate(path string, length int64) (err error) = SYS_TRUNCATE64 82//sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 83 84//sys mmap2(addr uintptr, length uintptr, prot int, flags int, fd int, pageOffset uintptr) (xaddr uintptr, err error) 85//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) 86 87func Stat(path string, stat *Stat_t) (err error) { 88 return fstatat(_AT_FDCWD, path, stat, 0) 89} 90 91func Lchown(path string, uid int, gid int) (err error) { 92 return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW) 93} 94 95func Lstat(path string, stat *Stat_t) (err error) { 96 return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW) 97} 98 99func Fstatfs(fd int, buf *Statfs_t) (err error) { 100 _, _, e := Syscall(SYS_FSTATFS64, uintptr(fd), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 101 if e != 0 { 102 err = e 103 } 104 return 105} 106 107func Statfs(path string, buf *Statfs_t) (err error) { 108 pathp, err := BytePtrFromString(path) 109 if err != nil { 110 return err 111 } 112 _, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(pathp)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf))) 113 if e != 0 { 114 err = e 115 } 116 return 117} 118 119func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) { 120 page := uintptr(offset / 4096) 121 if offset != int64(page)*4096 { 122 return 0, EINVAL 123 } 124 return mmap2(addr, length, prot, flags, fd, page) 125} 126 127type rlimit32 struct { 128 Cur uint32 129 Max uint32 130} 131 132//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT 133 134const rlimInf32 = ^uint32(0) 135const rlimInf64 = ^uint64(0) 136 137func Getrlimit(resource int, rlim *Rlimit) (err error) { 138 err = prlimit(0, resource, nil, rlim) 139 if err != ENOSYS { 140 return err 141 } 142 143 rl := rlimit32{} 144 err = getrlimit(resource, &rl) 145 if err != nil { 146 return 147 } 148 149 if rl.Cur == rlimInf32 { 150 rlim.Cur = rlimInf64 151 } else { 152 rlim.Cur = uint64(rl.Cur) 153 } 154 155 if rl.Max == rlimInf32 { 156 rlim.Max = rlimInf64 157 } else { 158 rlim.Max = uint64(rl.Max) 159 } 160 return 161} 162 163//sysnb setrlimit1(resource int, rlim *rlimit32) (err error) = SYS_SETRLIMIT 164 165func setrlimit(resource int, rlim *Rlimit) (err error) { 166 err = prlimit(0, resource, rlim, nil) 167 if err != ENOSYS { 168 return err 169 } 170 171 rl := rlimit32{} 172 if rlim.Cur == rlimInf64 { 173 rl.Cur = rlimInf32 174 } else if rlim.Cur < uint64(rlimInf32) { 175 rl.Cur = uint32(rlim.Cur) 176 } else { 177 return EINVAL 178 } 179 if rlim.Max == rlimInf64 { 180 rl.Max = rlimInf32 181 } else if rlim.Max < uint64(rlimInf32) { 182 rl.Max = uint32(rlim.Max) 183 } else { 184 return EINVAL 185 } 186 187 return setrlimit1(resource, &rl) 188} 189 190//go:nosplit 191func rawSetrlimit(resource int, rlim *Rlimit) Errno { 192 _, _, errno := RawSyscall6(SYS_PRLIMIT64, 0, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0, 0, 0) 193 if errno != ENOSYS { 194 return errno 195 } 196 197 rl := rlimit32{} 198 if rlim.Cur == rlimInf64 { 199 rl.Cur = rlimInf32 200 } else if rlim.Cur < uint64(rlimInf32) { 201 rl.Cur = uint32(rlim.Cur) 202 } else { 203 return EINVAL 204 } 205 if rlim.Max == rlimInf64 { 206 rl.Max = rlimInf32 207 } else if rlim.Max < uint64(rlimInf32) { 208 rl.Max = uint32(rlim.Max) 209 } else { 210 return EINVAL 211 } 212 213 _, _, errno = RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0) 214 return errno 215} 216 217func (r *PtraceRegs) PC() uint64 { return uint64(r.Uregs[15]) } 218 219func (r *PtraceRegs) SetPC(pc uint64) { r.Uregs[15] = uint32(pc) } 220 221func (iov *Iovec) SetLen(length int) { 222 iov.Len = uint32(length) 223} 224 225func (msghdr *Msghdr) SetControllen(length int) { 226 msghdr.Controllen = uint32(length) 227} 228 229func (cmsg *Cmsghdr) SetLen(length int) { 230 cmsg.Len = uint32(length) 231} 232