github.com/megatontech/mynoteforgo@v0.0.0-20200507084910-5d0c6ea6e890/源码/syscall/syscall_freebsd.go (about) 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 // FreeBSD 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 "sync" 17 "unsafe" 18 ) 19 20 const ( 21 _SYS_FSTAT_FREEBSD12 = 551 // { int fstat(int fd, _Out_ struct stat *sb); } 22 _SYS_FSTATAT_FREEBSD12 = 552 // { int fstatat(int fd, _In_z_ char *path, \ 23 _SYS_GETDIRENTRIES_FREEBSD12 = 554 // { ssize_t getdirentries(int fd, \ 24 _SYS_STATFS_FREEBSD12 = 555 // { int statfs(_In_z_ char *path, \ 25 _SYS_FSTATFS_FREEBSD12 = 556 // { int fstatfs(int fd, \ 26 _SYS_GETFSSTAT_FREEBSD12 = 557 // { int getfsstat( \ 27 _SYS_MKNODAT_FREEBSD12 = 559 // { int mknodat(int fd, _In_z_ char *path, \ 28 ) 29 30 // See https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html. 31 var ( 32 osreldateOnce sync.Once 33 osreldate uint32 34 ) 35 36 // INO64_FIRST from /usr/src/lib/libc/sys/compat-ino64.h 37 const _ino64First = 1200031 38 39 func supportsABI(ver uint32) bool { 40 osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") }) 41 return osreldate >= ver 42 } 43 44 type SockaddrDatalink struct { 45 Len uint8 46 Family uint8 47 Index uint16 48 Type uint8 49 Nlen uint8 50 Alen uint8 51 Slen uint8 52 Data [46]int8 53 raw RawSockaddrDatalink 54 } 55 56 // Translate "kern.hostname" to []_C_int{0,1,2,3}. 57 func nametomib(name string) (mib []_C_int, err error) { 58 const siz = unsafe.Sizeof(mib[0]) 59 60 // NOTE(rsc): It seems strange to set the buffer to have 61 // size CTL_MAXNAME+2 but use only CTL_MAXNAME 62 // as the size. I don't know why the +2 is here, but the 63 // kernel uses +2 for its own implementation of this function. 64 // I am scared that if we don't include the +2 here, the kernel 65 // will silently write 2 words farther than we specify 66 // and we'll get memory corruption. 67 var buf [CTL_MAXNAME + 2]_C_int 68 n := uintptr(CTL_MAXNAME) * siz 69 70 p := (*byte)(unsafe.Pointer(&buf[0])) 71 bytes, err := ByteSliceFromString(name) 72 if err != nil { 73 return nil, err 74 } 75 76 // Magic sysctl: "setting" 0.3 to a string name 77 // lets you read back the array of integers form. 78 if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { 79 return nil, err 80 } 81 return buf[0 : n/siz], nil 82 } 83 84 func direntIno(buf []byte) (uint64, bool) { 85 return readInt(buf, unsafe.Offsetof(Dirent{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno)) 86 } 87 88 func direntReclen(buf []byte) (uint64, bool) { 89 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) 90 } 91 92 func direntNamlen(buf []byte) (uint64, bool) { 93 return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) 94 } 95 96 func Pipe(p []int) error { 97 return Pipe2(p, 0) 98 } 99 100 //sysnb pipe2(p *[2]_C_int, flags int) (err error) 101 102 func Pipe2(p []int, flags int) error { 103 if len(p) != 2 { 104 return EINVAL 105 } 106 var pp [2]_C_int 107 err := pipe2(&pp, flags) 108 p[0] = int(pp[0]) 109 p[1] = int(pp[1]) 110 return err 111 } 112 113 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 114 var value IPMreqn 115 vallen := _Socklen(SizeofIPMreqn) 116 errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 117 return &value, errno 118 } 119 120 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 121 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 122 } 123 124 func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) { 125 var rsa RawSockaddrAny 126 var len _Socklen = SizeofSockaddrAny 127 nfd, err = accept4(fd, &rsa, &len, flags) 128 if err != nil { 129 return 130 } 131 if len > SizeofSockaddrAny { 132 panic("RawSockaddrAny too small") 133 } 134 sa, err = anyToSockaddr(&rsa) 135 if err != nil { 136 Close(nfd) 137 nfd = 0 138 } 139 return 140 } 141 142 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 143 var ( 144 _p0 unsafe.Pointer 145 bufsize uintptr 146 oldBuf []statfs_freebsd11_t 147 needsConvert bool 148 ) 149 150 if len(buf) > 0 { 151 if supportsABI(_ino64First) { 152 _p0 = unsafe.Pointer(&buf[0]) 153 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 154 } else { 155 n := len(buf) 156 oldBuf = make([]statfs_freebsd11_t, n) 157 _p0 = unsafe.Pointer(&oldBuf[0]) 158 bufsize = unsafe.Sizeof(statfs_freebsd11_t{}) * uintptr(n) 159 needsConvert = true 160 } 161 } 162 var sysno uintptr = SYS_GETFSSTAT 163 if supportsABI(_ino64First) { 164 sysno = _SYS_GETFSSTAT_FREEBSD12 165 } 166 r0, _, e1 := Syscall(sysno, uintptr(_p0), bufsize, uintptr(flags)) 167 n = int(r0) 168 if e1 != 0 { 169 err = e1 170 } 171 if e1 == 0 && needsConvert { 172 for i := range oldBuf { 173 buf[i].convertFrom(&oldBuf[i]) 174 } 175 } 176 return 177 } 178 179 func setattrlistTimes(path string, times []Timespec) error { 180 // used on Darwin for UtimesNano 181 return ENOSYS 182 } 183 184 func Stat(path string, st *Stat_t) (err error) { 185 var oldStat stat_freebsd11_t 186 if supportsABI(_ino64First) { 187 return fstatat_freebsd12(_AT_FDCWD, path, st, 0) 188 } 189 err = stat(path, &oldStat) 190 if err != nil { 191 return err 192 } 193 194 st.convertFrom(&oldStat) 195 return nil 196 } 197 198 func Lstat(path string, st *Stat_t) (err error) { 199 var oldStat stat_freebsd11_t 200 if supportsABI(_ino64First) { 201 return fstatat_freebsd12(_AT_FDCWD, path, st, _AT_SYMLINK_NOFOLLOW) 202 } 203 err = lstat(path, &oldStat) 204 if err != nil { 205 return err 206 } 207 208 st.convertFrom(&oldStat) 209 return nil 210 } 211 212 func Fstat(fd int, st *Stat_t) (err error) { 213 var oldStat stat_freebsd11_t 214 if supportsABI(_ino64First) { 215 return fstat_freebsd12(fd, st) 216 } 217 err = fstat(fd, &oldStat) 218 if err != nil { 219 return err 220 } 221 222 st.convertFrom(&oldStat) 223 return nil 224 } 225 226 func Fstatat(fd int, path string, st *Stat_t, flags int) (err error) { 227 var oldStat stat_freebsd11_t 228 if supportsABI(_ino64First) { 229 return fstatat_freebsd12(fd, path, st, flags) 230 } 231 err = fstatat(fd, path, &oldStat, flags) 232 if err != nil { 233 return err 234 } 235 236 st.convertFrom(&oldStat) 237 return nil 238 } 239 240 func Statfs(path string, st *Statfs_t) (err error) { 241 var oldStatfs statfs_freebsd11_t 242 if supportsABI(_ino64First) { 243 return statfs_freebsd12(path, st) 244 } 245 err = statfs(path, &oldStatfs) 246 if err != nil { 247 return err 248 } 249 250 st.convertFrom(&oldStatfs) 251 return nil 252 } 253 254 func Fstatfs(fd int, st *Statfs_t) (err error) { 255 var oldStatfs statfs_freebsd11_t 256 if supportsABI(_ino64First) { 257 return fstatfs_freebsd12(fd, st) 258 } 259 err = fstatfs(fd, &oldStatfs) 260 if err != nil { 261 return err 262 } 263 264 st.convertFrom(&oldStatfs) 265 return nil 266 } 267 268 func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) { 269 if supportsABI(_ino64First) { 270 return getdirentries_freebsd12(fd, buf, basep) 271 } 272 273 // The old syscall entries are smaller than the new. Use 1/4 of the original 274 // buffer size rounded up to DIRBLKSIZ (see /usr/src/lib/libc/sys/getdirentries.c). 275 oldBufLen := roundup(len(buf)/4, _dirblksiz) 276 oldBuf := make([]byte, oldBufLen) 277 n, err = getdirentries(fd, oldBuf, basep) 278 if err == nil && n > 0 { 279 n = convertFromDirents11(buf, oldBuf[:n]) 280 } 281 return 282 } 283 284 func Mknod(path string, mode uint32, dev uint64) (err error) { 285 var oldDev int 286 if supportsABI(_ino64First) { 287 return mknodat_freebsd12(_AT_FDCWD, path, mode, dev) 288 } 289 oldDev = int(dev) 290 return mknod(path, mode, oldDev) 291 } 292 293 // round x to the nearest multiple of y, larger or equal to x. 294 // 295 // from /usr/include/sys/param.h Macros for counting and rounding. 296 // #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 297 func roundup(x, y int) int { 298 return ((x + y - 1) / y) * y 299 } 300 301 func (s *Stat_t) convertFrom(old *stat_freebsd11_t) { 302 *s = Stat_t{ 303 Dev: uint64(old.Dev), 304 Ino: uint64(old.Ino), 305 Nlink: uint64(old.Nlink), 306 Mode: old.Mode, 307 Uid: old.Uid, 308 Gid: old.Gid, 309 Rdev: uint64(old.Rdev), 310 Atimespec: old.Atimespec, 311 Mtimespec: old.Mtimespec, 312 Ctimespec: old.Ctimespec, 313 Birthtimespec: old.Birthtimespec, 314 Size: old.Size, 315 Blocks: old.Blocks, 316 Blksize: old.Blksize, 317 Flags: old.Flags, 318 Gen: uint64(old.Gen), 319 } 320 } 321 322 func (s *Statfs_t) convertFrom(old *statfs_freebsd11_t) { 323 *s = Statfs_t{ 324 Version: _statfsVersion, 325 Type: old.Type, 326 Flags: old.Flags, 327 Bsize: old.Bsize, 328 Iosize: old.Iosize, 329 Blocks: old.Blocks, 330 Bfree: old.Bfree, 331 Bavail: old.Bavail, 332 Files: old.Files, 333 Ffree: old.Ffree, 334 Syncwrites: old.Syncwrites, 335 Asyncwrites: old.Asyncwrites, 336 Syncreads: old.Syncreads, 337 Asyncreads: old.Asyncreads, 338 // Spare 339 Namemax: old.Namemax, 340 Owner: old.Owner, 341 Fsid: old.Fsid, 342 // Charspare 343 // Fstypename 344 // Mntfromname 345 // Mntonname 346 } 347 348 sl := old.Fstypename[:] 349 n := clen(*(*[]byte)(unsafe.Pointer(&sl))) 350 copy(s.Fstypename[:], old.Fstypename[:n]) 351 352 sl = old.Mntfromname[:] 353 n = clen(*(*[]byte)(unsafe.Pointer(&sl))) 354 copy(s.Mntfromname[:], old.Mntfromname[:n]) 355 356 sl = old.Mntonname[:] 357 n = clen(*(*[]byte)(unsafe.Pointer(&sl))) 358 copy(s.Mntonname[:], old.Mntonname[:n]) 359 } 360 361 func convertFromDirents11(buf []byte, old []byte) int { 362 const ( 363 fixedSize = int(unsafe.Offsetof(Dirent{}.Name)) 364 oldFixedSize = int(unsafe.Offsetof(dirent_freebsd11{}.Name)) 365 ) 366 367 dstPos := 0 368 srcPos := 0 369 for dstPos+fixedSize < len(buf) && srcPos+oldFixedSize < len(old) { 370 dstDirent := (*Dirent)(unsafe.Pointer(&buf[dstPos])) 371 srcDirent := (*dirent_freebsd11)(unsafe.Pointer(&old[srcPos])) 372 373 reclen := roundup(fixedSize+int(srcDirent.Namlen)+1, 8) 374 if dstPos+reclen > len(buf) { 375 break 376 } 377 378 dstDirent.Fileno = uint64(srcDirent.Fileno) 379 dstDirent.Off = 0 380 dstDirent.Reclen = uint16(reclen) 381 dstDirent.Type = srcDirent.Type 382 dstDirent.Pad0 = 0 383 dstDirent.Namlen = uint16(srcDirent.Namlen) 384 dstDirent.Pad1 = 0 385 386 copy(dstDirent.Name[:], srcDirent.Name[:srcDirent.Namlen]) 387 padding := buf[dstPos+fixedSize+int(dstDirent.Namlen) : dstPos+reclen] 388 for i := range padding { 389 padding[i] = 0 390 } 391 392 dstPos += int(dstDirent.Reclen) 393 srcPos += int(srcDirent.Reclen) 394 } 395 396 return dstPos 397 } 398 399 /* 400 * Exposed directly 401 */ 402 //sys Access(path string, mode uint32) (err error) 403 //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 404 //sys Chdir(path string) (err error) 405 //sys Chflags(path string, flags int) (err error) 406 //sys Chmod(path string, mode uint32) (err error) 407 //sys Chown(path string, uid int, gid int) (err error) 408 //sys Chroot(path string) (err error) 409 //sys Close(fd int) (err error) 410 //sys Dup(fd int) (nfd int, err error) 411 //sys Dup2(from int, to int) (err error) 412 //sys Fchdir(fd int) (err error) 413 //sys Fchflags(fd int, flags int) (err error) 414 //sys Fchmod(fd int, mode uint32) (err error) 415 //sys Fchown(fd int, uid int, gid int) (err error) 416 //sys Flock(fd int, how int) (err error) 417 //sys Fpathconf(fd int, name int) (val int, err error) 418 //sys fstat(fd int, stat *stat_freebsd11_t) (err error) 419 //sys fstat_freebsd12(fd int, stat *Stat_t) (err error) = _SYS_FSTAT_FREEBSD12 420 //sys fstatat(fd int, path string, stat *stat_freebsd11_t, flags int) (err error) 421 //sys fstatat_freebsd12(fd int, path string, stat *Stat_t, flags int) (err error) = _SYS_FSTATAT_FREEBSD12 422 //sys fstatfs(fd int, stat *statfs_freebsd11_t) (err error) 423 //sys fstatfs_freebsd12(fd int, stat *Statfs_t) (err error) = _SYS_FSTATFS_FREEBSD12 424 //sys Fsync(fd int) (err error) 425 //sys Ftruncate(fd int, length int64) (err error) 426 //sys getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) 427 //sys getdirentries_freebsd12(fd int, buf []byte, basep *uintptr) (n int, err error) = _SYS_GETDIRENTRIES_FREEBSD12 428 //sys Getdtablesize() (size int) 429 //sysnb Getegid() (egid int) 430 //sysnb Geteuid() (uid int) 431 //sysnb Getgid() (gid int) 432 //sysnb Getpgid(pid int) (pgid int, err error) 433 //sysnb Getpgrp() (pgrp int) 434 //sysnb Getpid() (pid int) 435 //sysnb Getppid() (ppid int) 436 //sys Getpriority(which int, who int) (prio int, err error) 437 //sysnb Getrlimit(which int, lim *Rlimit) (err error) 438 //sysnb Getrusage(who int, rusage *Rusage) (err error) 439 //sysnb Getsid(pid int) (sid int, err error) 440 //sysnb Gettimeofday(tv *Timeval) (err error) 441 //sysnb Getuid() (uid int) 442 //sys Issetugid() (tainted bool) 443 //sys Kill(pid int, signum Signal) (err error) 444 //sys Kqueue() (fd int, err error) 445 //sys Lchown(path string, uid int, gid int) (err error) 446 //sys Link(path string, link string) (err error) 447 //sys Listen(s int, backlog int) (err error) 448 //sys lstat(path string, stat *stat_freebsd11_t) (err error) 449 //sys Mkdir(path string, mode uint32) (err error) 450 //sys Mkfifo(path string, mode uint32) (err error) 451 //sys mknod(path string, mode uint32, dev int) (err error) 452 //sys mknodat_freebsd12(fd int, path string, mode uint32, dev uint64) (err error) = _SYS_MKNODAT_FREEBSD12 453 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 454 //sys Open(path string, mode int, perm uint32) (fd int, err error) 455 //sys Pathconf(path string, name int) (val int, err error) 456 //sys Pread(fd int, p []byte, offset int64) (n int, err error) 457 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) 458 //sys read(fd int, p []byte) (n int, err error) 459 //sys Readlink(path string, buf []byte) (n int, err error) 460 //sys Rename(from string, to string) (err error) 461 //sys Revoke(path string) (err error) 462 //sys Rmdir(path string) (err error) 463 //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK 464 //sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) 465 //sysnb Setegid(egid int) (err error) 466 //sysnb Seteuid(euid int) (err error) 467 //sysnb Setgid(gid int) (err error) 468 //sys Setlogin(name string) (err error) 469 //sysnb Setpgid(pid int, pgid int) (err error) 470 //sys Setpriority(which int, who int, prio int) (err error) 471 //sysnb Setregid(rgid int, egid int) (err error) 472 //sysnb Setreuid(ruid int, euid int) (err error) 473 //sysnb Setrlimit(which int, lim *Rlimit) (err error) 474 //sysnb Setsid() (pid int, err error) 475 //sysnb Settimeofday(tp *Timeval) (err error) 476 //sysnb Setuid(uid int) (err error) 477 //sys stat(path string, stat *stat_freebsd11_t) (err error) 478 //sys statfs(path string, stat *statfs_freebsd11_t) (err error) 479 //sys statfs_freebsd12(path string, stat *Statfs_t) (err error) = _SYS_STATFS_FREEBSD12 480 //sys Symlink(path string, link string) (err error) 481 //sys Sync() (err error) 482 //sys Truncate(path string, length int64) (err error) 483 //sys Umask(newmask int) (oldmask int) 484 //sys Undelete(path string) (err error) 485 //sys Unlink(path string) (err error) 486 //sys Unmount(path string, flags int) (err error) 487 //sys write(fd int, p []byte) (n int, err error) 488 //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 489 //sys munmap(addr uintptr, length uintptr) (err error) 490 //sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ 491 //sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE 492 //sys accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error) 493 //sys utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error) 494 //sys getcwd(buf []byte) (n int, err error) = SYS___GETCWD 495 //sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL