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