Source file src/syscall/syscall_darwin.go
1 // Copyright 2009,2010 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 // Darwin system calls. 6 // This file is compiled as ordinary Go code, 7 // but it is also input to mksyscall, 8 // which parses the //sys lines and generates system call stubs. 9 // Note that sometimes we use a lowercase //sys name and wrap 10 // it in our own nicer implementation, either here or in 11 // syscall_bsd.go or syscall_unix.go. 12 13 package syscall 14 15 import ( 16 "internal/abi" 17 "unsafe" 18 ) 19 20 func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) 21 func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) 22 func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) 23 func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) 24 25 var dupTrampoline = abi.FuncPCABI0(libc_dup2_trampoline) 26 27 type SockaddrDatalink struct { 28 Len uint8 29 Family uint8 30 Index uint16 31 Type uint8 32 Nlen uint8 33 Alen uint8 34 Slen uint8 35 Data [12]int8 36 raw RawSockaddrDatalink 37 } 38 39 // Translate "kern.hostname" to []_C_int{0,1,2,3}. 40 func nametomib(name string) (mib []_C_int, err error) { 41 const siz = unsafe.Sizeof(mib[0]) 42 43 // NOTE(rsc): It seems strange to set the buffer to have 44 // size CTL_MAXNAME+2 but use only CTL_MAXNAME 45 // as the size. I don't know why the +2 is here, but the 46 // kernel uses +2 for its own implementation of this function. 47 // I am scared that if we don't include the +2 here, the kernel 48 // will silently write 2 words farther than we specify 49 // and we'll get memory corruption. 50 var buf [CTL_MAXNAME + 2]_C_int 51 n := uintptr(CTL_MAXNAME) * siz 52 53 p := (*byte)(unsafe.Pointer(&buf[0])) 54 bytes, err := ByteSliceFromString(name) 55 if err != nil { 56 return nil, err 57 } 58 59 // Magic sysctl: "setting" 0.3 to a string name 60 // lets you read back the array of integers form. 61 if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { 62 return nil, err 63 } 64 return buf[0 : n/siz], nil 65 } 66 67 func direntIno(buf []byte) (uint64, bool) { 68 return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) 69 } 70 71 func direntReclen(buf []byte) (uint64, bool) { 72 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 73 } 74 75 func direntNamlen(buf []byte) (uint64, bool) { 76 return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) 77 } 78 79 func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } 80 func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } 81 82 //sysnb pipe(p *[2]int32) (err error) 83 84 func Pipe(p []int) (err error) { 85 if len(p) != 2 { 86 return EINVAL 87 } 88 var q [2]int32 89 err = pipe(&q) 90 if err == nil { 91 p[0] = int(q[0]) 92 p[1] = int(q[1]) 93 } 94 return 95 } 96 97 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 98 var _p0 unsafe.Pointer 99 var bufsize uintptr 100 if len(buf) > 0 { 101 _p0 = unsafe.Pointer(&buf[0]) 102 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 103 } 104 r0, _, e1 := syscall(abi.FuncPCABI0(libc_getfsstat_trampoline), uintptr(_p0), bufsize, uintptr(flags)) 105 n = int(r0) 106 if e1 != 0 { 107 err = e1 108 } 109 return 110 } 111 112 func libc_getfsstat_trampoline() 113 114 //go:cgo_import_dynamic libc_getfsstat getfsstat "/usr/lib/libSystem.B.dylib" 115 116 //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) 117 118 /* 119 * Wrapped 120 */ 121 122 //sys kill(pid int, signum int, posix int) (err error) 123 124 func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1) } 125 126 /* 127 * Exposed directly 128 */ 129 //sys Access(path string, mode uint32) (err error) 130 //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 131 //sys Chdir(path string) (err error) 132 //sys Chflags(path string, flags int) (err error) 133 //sys Chmod(path string, mode uint32) (err error) 134 //sys Chown(path string, uid int, gid int) (err error) 135 //sys Chroot(path string) (err error) 136 //sys Close(fd int) (err error) 137 //sys closedir(dir uintptr) (err error) 138 //sys Dup(fd int) (nfd int, err error) 139 //sys Dup2(from int, to int) (err error) 140 //sys Exchangedata(path1 string, path2 string, options int) (err error) 141 //sys Fchdir(fd int) (err error) 142 //sys Fchflags(fd int, flags int) (err error) 143 //sys Fchmod(fd int, mode uint32) (err error) 144 //sys Fchown(fd int, uid int, gid int) (err error) 145 //sys Flock(fd int, how int) (err error) 146 //sys Fpathconf(fd int, name int) (val int, err error) 147 //sys Fsync(fd int) (err error) 148 // Fsync is not called for os.File.Sync(). Please see internal/poll/fd_fsync_darwin.go 149 //sys Ftruncate(fd int, length int64) (err error) 150 //sys Getdtablesize() (size int) 151 //sysnb Getegid() (egid int) 152 //sysnb Geteuid() (uid int) 153 //sysnb Getgid() (gid int) 154 //sysnb Getpgid(pid int) (pgid int, err error) 155 //sysnb Getpgrp() (pgrp int) 156 //sysnb Getpid() (pid int) 157 //sysnb Getppid() (ppid int) 158 //sys Getpriority(which int, who int) (prio int, err error) 159 //sysnb Getrlimit(which int, lim *Rlimit) (err error) 160 //sysnb Getrusage(who int, rusage *Rusage) (err error) 161 //sysnb Getsid(pid int) (sid int, err error) 162 //sysnb Getuid() (uid int) 163 //sysnb Issetugid() (tainted bool) 164 //sys Kqueue() (fd int, err error) 165 //sys Lchown(path string, uid int, gid int) (err error) 166 //sys Link(path string, link string) (err error) 167 //sys Listen(s int, backlog int) (err error) 168 //sys Mkdir(path string, mode uint32) (err error) 169 //sys Mkfifo(path string, mode uint32) (err error) 170 //sys Mknod(path string, mode uint32, dev int) (err error) 171 //sys Mlock(b []byte) (err error) 172 //sys Mlockall(flags int) (err error) 173 //sys Mprotect(b []byte, prot int) (err error) 174 //sys msync(b []byte, flags int) (err error) 175 //sys Munlock(b []byte) (err error) 176 //sys Munlockall() (err error) 177 //sys Open(path string, mode int, perm uint32) (fd int, err error) 178 //sys Pathconf(path string, name int) (val int, err error) 179 //sys pread(fd int, p []byte, offset int64) (n int, err error) 180 //sys pwrite(fd int, p []byte, offset int64) (n int, err error) 181 //sys read(fd int, p []byte) (n int, err error) 182 //sys readdir_r(dir uintptr, entry *Dirent, result **Dirent) (res Errno) 183 //sys Readlink(path string, buf []byte) (n int, err error) 184 //sys Rename(from string, to string) (err error) 185 //sys Revoke(path string) (err error) 186 //sys Rmdir(path string) (err error) 187 //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_lseek 188 //sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) 189 //sys Setegid(egid int) (err error) 190 //sysnb Seteuid(euid int) (err error) 191 //sysnb Setgid(gid int) (err error) 192 //sys Setlogin(name string) (err error) 193 //sysnb Setpgid(pid int, pgid int) (err error) 194 //sys Setpriority(which int, who int, prio int) (err error) 195 //sys Setprivexec(flag int) (err error) 196 //sysnb Setregid(rgid int, egid int) (err error) 197 //sysnb Setreuid(ruid int, euid int) (err error) 198 //sysnb setrlimit(which int, lim *Rlimit) (err error) 199 //sysnb Setsid() (pid int, err error) 200 //sysnb Settimeofday(tp *Timeval) (err error) 201 //sysnb Setuid(uid int) (err error) 202 //sys Symlink(path string, link string) (err error) 203 //sys Sync() (err error) 204 //sys Truncate(path string, length int64) (err error) 205 //sys Umask(newmask int) (oldmask int) 206 //sys Undelete(path string) (err error) 207 //sys Unlink(path string) (err error) 208 //sys Unmount(path string, flags int) (err error) 209 //sys write(fd int, p []byte) (n int, err error) 210 //sys writev(fd int, iovecs []Iovec) (cnt uintptr, err error) 211 //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 212 //sys munmap(addr uintptr, length uintptr) (err error) 213 //sysnb fork() (pid int, err error) 214 //sysnb ioctl(fd int, req int, arg int) (err error) 215 //sysnb ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_ioctl 216 //sysnb execve(path *byte, argv **byte, envp **byte) (err error) 217 //sysnb exit(res int) (err error) 218 //sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) 219 //sys fcntlPtr(fd int, cmd int, arg unsafe.Pointer) (val int, err error) = SYS_fcntl 220 //sys unlinkat(fd int, path string, flags int) (err error) 221 //sys openat(fd int, path string, flags int, perm uint32) (fdret int, err error) 222 //sys getcwd(buf []byte) (n int, err error) 223 224 func init() { 225 execveDarwin = execve 226 } 227 228 func fdopendir(fd int) (dir uintptr, err error) { 229 r0, _, e1 := syscallPtr(abi.FuncPCABI0(libc_fdopendir_trampoline), uintptr(fd), 0, 0) 230 dir = r0 231 if e1 != 0 { 232 err = errnoErr(e1) 233 } 234 return 235 } 236 237 func libc_fdopendir_trampoline() 238 239 //go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib" 240 241 func readlen(fd int, buf *byte, nbuf int) (n int, err error) { 242 r0, _, e1 := syscall(abi.FuncPCABI0(libc_read_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf)) 243 n = int(r0) 244 if e1 != 0 { 245 err = errnoErr(e1) 246 } 247 return 248 } 249 250 func writelen(fd int, buf *byte, nbuf int) (n int, err error) { 251 r0, _, e1 := syscall(abi.FuncPCABI0(libc_write_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf)) 252 n = int(r0) 253 if e1 != 0 { 254 err = errnoErr(e1) 255 } 256 return 257 } 258 259 func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) { 260 // Simulate Getdirentries using fdopendir/readdir_r/closedir. 261 // We store the number of entries to skip in the seek 262 // offset of fd. See issue #31368. 263 // It's not the full required semantics, but should handle the case 264 // of calling Getdirentries or ReadDirent repeatedly. 265 // It won't handle assigning the results of lseek to *basep, or handle 266 // the directory being edited underfoot. 267 skip, err := Seek(fd, 0, 1 /* SEEK_CUR */) 268 if err != nil { 269 return 0, err 270 } 271 272 // We need to duplicate the incoming file descriptor 273 // because the caller expects to retain control of it, but 274 // fdopendir expects to take control of its argument. 275 // Just Dup'ing the file descriptor is not enough, as the 276 // result shares underlying state. Use openat to make a really 277 // new file descriptor referring to the same directory. 278 fd2, err := openat(fd, ".", O_RDONLY, 0) 279 if err != nil { 280 return 0, err 281 } 282 d, err := fdopendir(fd2) 283 if err != nil { 284 Close(fd2) 285 return 0, err 286 } 287 defer closedir(d) 288 289 var cnt int64 290 for { 291 var entry Dirent 292 var entryp *Dirent 293 e := readdir_r(d, &entry, &entryp) 294 if e != 0 { 295 return n, errnoErr(e) 296 } 297 if entryp == nil { 298 break 299 } 300 if skip > 0 { 301 skip-- 302 cnt++ 303 continue 304 } 305 reclen := int(entry.Reclen) 306 if reclen > len(buf) { 307 // Not enough room. Return for now. 308 // The counter will let us know where we should start up again. 309 // Note: this strategy for suspending in the middle and 310 // restarting is O(n^2) in the length of the directory. Oh well. 311 break 312 } 313 // Copy entry into return buffer. 314 copy(buf, unsafe.Slice((*byte)(unsafe.Pointer(&entry)), reclen)) 315 buf = buf[reclen:] 316 n += reclen 317 cnt++ 318 } 319 // Set the seek offset of the input fd to record 320 // how many files we've already returned. 321 _, err = Seek(fd, cnt, 0 /* SEEK_SET */) 322 if err != nil { 323 return n, err 324 } 325 326 return n, nil 327 } 328 329 // Implemented in the runtime package (runtime/sys_darwin.go) 330 func syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) 331 func syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) 332 func syscall6X(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) 333 func rawSyscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) 334 func rawSyscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) 335 func syscallPtr(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) 336