github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/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, _Out_ struct stat *buf, int flag); } 23 _SYS_GETDIRENTRIES_FREEBSD12 = 554 // { ssize_t getdirentries(int fd, _Out_writes_bytes_(count) char *buf, size_t count, _Out_ off_t *basep); } 24 _SYS_STATFS_FREEBSD12 = 555 // { int statfs(_In_z_ char *path, _Out_ struct statfs *buf); } 25 _SYS_FSTATFS_FREEBSD12 = 556 // { int fstatfs(int fd, _Out_ struct statfs *buf); } 26 _SYS_GETFSSTAT_FREEBSD12 = 557 // { int getfsstat(_Out_writes_bytes_opt_(bufsize) struct statfs *buf, long bufsize, int mode); } 27 _SYS_MKNODAT_FREEBSD12 = 559 // { int mknodat(int fd, _In_z_ char *path, mode_t mode, dev_t dev); } 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 if err == nil { 109 p[0] = int(pp[0]) 110 p[1] = int(pp[1]) 111 } 112 return err 113 } 114 115 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) { 116 var value IPMreqn 117 vallen := _Socklen(SizeofIPMreqn) 118 errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) 119 return &value, errno 120 } 121 122 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) { 123 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq)) 124 } 125 126 func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) { 127 var rsa RawSockaddrAny 128 var len _Socklen = SizeofSockaddrAny 129 nfd, err = accept4(fd, &rsa, &len, flags) 130 if err != nil { 131 return 132 } 133 if len > SizeofSockaddrAny { 134 panic("RawSockaddrAny too small") 135 } 136 sa, err = anyToSockaddr(&rsa) 137 if err != nil { 138 Close(nfd) 139 nfd = 0 140 } 141 return 142 } 143 144 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { 145 var ( 146 _p0 unsafe.Pointer 147 bufsize uintptr 148 oldBuf []statfs_freebsd11_t 149 needsConvert bool 150 ) 151 152 if len(buf) > 0 { 153 if supportsABI(_ino64First) { 154 _p0 = unsafe.Pointer(&buf[0]) 155 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) 156 } else { 157 n := len(buf) 158 oldBuf = make([]statfs_freebsd11_t, n) 159 _p0 = unsafe.Pointer(&oldBuf[0]) 160 bufsize = unsafe.Sizeof(statfs_freebsd11_t{}) * uintptr(n) 161 needsConvert = true 162 } 163 } 164 var sysno uintptr = SYS_GETFSSTAT 165 if supportsABI(_ino64First) { 166 sysno = _SYS_GETFSSTAT_FREEBSD12 167 } 168 r0, _, e1 := Syscall(sysno, uintptr(_p0), bufsize, uintptr(flags)) 169 n = int(r0) 170 if e1 != 0 { 171 err = e1 172 } 173 if e1 == 0 && needsConvert { 174 for i := range oldBuf { 175 buf[i].convertFrom(&oldBuf[i]) 176 } 177 } 178 return 179 } 180 181 func setattrlistTimes(path string, times []Timespec) error { 182 // used on Darwin for UtimesNano 183 return ENOSYS 184 } 185 186 func Stat(path string, st *Stat_t) (err error) { 187 var oldStat stat_freebsd11_t 188 if supportsABI(_ino64First) { 189 return fstatat_freebsd12(_AT_FDCWD, path, st, 0) 190 } 191 err = stat(path, &oldStat) 192 if err != nil { 193 return err 194 } 195 196 st.convertFrom(&oldStat) 197 return nil 198 } 199 200 func Lstat(path string, st *Stat_t) (err error) { 201 var oldStat stat_freebsd11_t 202 if supportsABI(_ino64First) { 203 return fstatat_freebsd12(_AT_FDCWD, path, st, _AT_SYMLINK_NOFOLLOW) 204 } 205 err = lstat(path, &oldStat) 206 if err != nil { 207 return err 208 } 209 210 st.convertFrom(&oldStat) 211 return nil 212 } 213 214 func Fstat(fd int, st *Stat_t) (err error) { 215 var oldStat stat_freebsd11_t 216 if supportsABI(_ino64First) { 217 return fstat_freebsd12(fd, st) 218 } 219 err = fstat(fd, &oldStat) 220 if err != nil { 221 return err 222 } 223 224 st.convertFrom(&oldStat) 225 return nil 226 } 227 228 func Fstatat(fd int, path string, st *Stat_t, flags int) (err error) { 229 var oldStat stat_freebsd11_t 230 if supportsABI(_ino64First) { 231 return fstatat_freebsd12(fd, path, st, flags) 232 } 233 err = fstatat(fd, path, &oldStat, flags) 234 if err != nil { 235 return err 236 } 237 238 st.convertFrom(&oldStat) 239 return nil 240 } 241 242 func Statfs(path string, st *Statfs_t) (err error) { 243 var oldStatfs statfs_freebsd11_t 244 if supportsABI(_ino64First) { 245 return statfs_freebsd12(path, st) 246 } 247 err = statfs(path, &oldStatfs) 248 if err != nil { 249 return err 250 } 251 252 st.convertFrom(&oldStatfs) 253 return nil 254 } 255 256 func Fstatfs(fd int, st *Statfs_t) (err error) { 257 var oldStatfs statfs_freebsd11_t 258 if supportsABI(_ino64First) { 259 return fstatfs_freebsd12(fd, st) 260 } 261 err = fstatfs(fd, &oldStatfs) 262 if err != nil { 263 return err 264 } 265 266 st.convertFrom(&oldStatfs) 267 return nil 268 } 269 270 func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) { 271 if supportsABI(_ino64First) { 272 if basep == nil || unsafe.Sizeof(*basep) == 8 { 273 return getdirentries_freebsd12(fd, buf, (*uint64)(unsafe.Pointer(basep))) 274 } 275 // The freebsd12 syscall needs a 64-bit base. On 32-bit machines 276 // we can't just use the basep passed in. See #32498. 277 var base uint64 = uint64(*basep) 278 n, err = getdirentries_freebsd12(fd, buf, &base) 279 *basep = uintptr(base) 280 if base>>32 != 0 { 281 // We can't stuff the base back into a uintptr, so any 282 // future calls would be suspect. Generate an error. 283 // EIO is allowed by getdirentries. 284 err = EIO 285 } 286 return 287 } 288 289 // The old syscall entries are smaller than the new. Use 1/4 of the original 290 // buffer size rounded up to DIRBLKSIZ (see /usr/src/lib/libc/sys/getdirentries.c). 291 oldBufLen := roundup(len(buf)/4, _dirblksiz) 292 oldBuf := make([]byte, oldBufLen) 293 n, err = getdirentries(fd, oldBuf, basep) 294 if err == nil && n > 0 { 295 n = convertFromDirents11(buf, oldBuf[:n]) 296 } 297 return 298 } 299 300 func Mknod(path string, mode uint32, dev uint64) (err error) { 301 var oldDev int 302 if supportsABI(_ino64First) { 303 return mknodat_freebsd12(_AT_FDCWD, path, mode, dev) 304 } 305 oldDev = int(dev) 306 return mknod(path, mode, oldDev) 307 } 308 309 // round x to the nearest multiple of y, larger or equal to x. 310 // 311 // from /usr/include/sys/param.h Macros for counting and rounding. 312 // #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 313 func roundup(x, y int) int { 314 return ((x + y - 1) / y) * y 315 } 316 317 func (s *Stat_t) convertFrom(old *stat_freebsd11_t) { 318 *s = Stat_t{ 319 Dev: uint64(old.Dev), 320 Ino: uint64(old.Ino), 321 Nlink: uint64(old.Nlink), 322 Mode: old.Mode, 323 Uid: old.Uid, 324 Gid: old.Gid, 325 Rdev: uint64(old.Rdev), 326 Atimespec: old.Atimespec, 327 Mtimespec: old.Mtimespec, 328 Ctimespec: old.Ctimespec, 329 Birthtimespec: old.Birthtimespec, 330 Size: old.Size, 331 Blocks: old.Blocks, 332 Blksize: old.Blksize, 333 Flags: old.Flags, 334 Gen: uint64(old.Gen), 335 } 336 } 337 338 func (s *Statfs_t) convertFrom(old *statfs_freebsd11_t) { 339 *s = Statfs_t{ 340 Version: _statfsVersion, 341 Type: old.Type, 342 Flags: old.Flags, 343 Bsize: old.Bsize, 344 Iosize: old.Iosize, 345 Blocks: old.Blocks, 346 Bfree: old.Bfree, 347 Bavail: old.Bavail, 348 Files: old.Files, 349 Ffree: old.Ffree, 350 Syncwrites: old.Syncwrites, 351 Asyncwrites: old.Asyncwrites, 352 Syncreads: old.Syncreads, 353 Asyncreads: old.Asyncreads, 354 // Spare 355 Namemax: old.Namemax, 356 Owner: old.Owner, 357 Fsid: old.Fsid, 358 // Charspare 359 // Fstypename 360 // Mntfromname 361 // Mntonname 362 } 363 364 sl := old.Fstypename[:] 365 n := clen(*(*[]byte)(unsafe.Pointer(&sl))) 366 copy(s.Fstypename[:], old.Fstypename[:n]) 367 368 sl = old.Mntfromname[:] 369 n = clen(*(*[]byte)(unsafe.Pointer(&sl))) 370 copy(s.Mntfromname[:], old.Mntfromname[:n]) 371 372 sl = old.Mntonname[:] 373 n = clen(*(*[]byte)(unsafe.Pointer(&sl))) 374 copy(s.Mntonname[:], old.Mntonname[:n]) 375 } 376 377 func convertFromDirents11(buf []byte, old []byte) int { 378 const ( 379 fixedSize = int(unsafe.Offsetof(Dirent{}.Name)) 380 oldFixedSize = int(unsafe.Offsetof(dirent_freebsd11{}.Name)) 381 ) 382 383 dstPos := 0 384 srcPos := 0 385 for dstPos+fixedSize < len(buf) && srcPos+oldFixedSize < len(old) { 386 var dstDirent Dirent 387 var srcDirent dirent_freebsd11 388 389 // If multiple direntries are written, sometimes when we reach the final one, 390 // we may have cap of old less than size of dirent_freebsd11. 391 copy((*[unsafe.Sizeof(srcDirent)]byte)(unsafe.Pointer(&srcDirent))[:], old[srcPos:]) 392 393 reclen := roundup(fixedSize+int(srcDirent.Namlen)+1, 8) 394 if dstPos+reclen > len(buf) { 395 break 396 } 397 398 dstDirent.Fileno = uint64(srcDirent.Fileno) 399 dstDirent.Off = 0 400 dstDirent.Reclen = uint16(reclen) 401 dstDirent.Type = srcDirent.Type 402 dstDirent.Pad0 = 0 403 dstDirent.Namlen = uint16(srcDirent.Namlen) 404 dstDirent.Pad1 = 0 405 406 copy(dstDirent.Name[:], srcDirent.Name[:srcDirent.Namlen]) 407 copy(buf[dstPos:], (*[unsafe.Sizeof(dstDirent)]byte)(unsafe.Pointer(&dstDirent))[:]) 408 padding := buf[dstPos+fixedSize+int(dstDirent.Namlen) : dstPos+reclen] 409 for i := range padding { 410 padding[i] = 0 411 } 412 413 dstPos += int(dstDirent.Reclen) 414 srcPos += int(srcDirent.Reclen) 415 } 416 417 return dstPos 418 } 419 420 /* 421 * Exposed directly 422 */ 423 //sys Access(path string, mode uint32) (err error) 424 //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) 425 //sys Chdir(path string) (err error) 426 //sys Chflags(path string, flags int) (err error) 427 //sys Chmod(path string, mode uint32) (err error) 428 //sys Chown(path string, uid int, gid int) (err error) 429 //sys Chroot(path string) (err error) 430 //sys Close(fd int) (err error) 431 //sys Dup(fd int) (nfd int, err error) 432 //sys Dup2(from int, to int) (err error) 433 //sys Fchdir(fd int) (err error) 434 //sys Fchflags(fd int, flags int) (err error) 435 //sys Fchmod(fd int, mode uint32) (err error) 436 //sys Fchown(fd int, uid int, gid int) (err error) 437 //sys Flock(fd int, how int) (err error) 438 //sys Fpathconf(fd int, name int) (val int, err error) 439 //sys fstat(fd int, stat *stat_freebsd11_t) (err error) 440 //sys fstat_freebsd12(fd int, stat *Stat_t) (err error) = _SYS_FSTAT_FREEBSD12 441 //sys fstatat(fd int, path string, stat *stat_freebsd11_t, flags int) (err error) 442 //sys fstatat_freebsd12(fd int, path string, stat *Stat_t, flags int) (err error) = _SYS_FSTATAT_FREEBSD12 443 //sys fstatfs(fd int, stat *statfs_freebsd11_t) (err error) 444 //sys fstatfs_freebsd12(fd int, stat *Statfs_t) (err error) = _SYS_FSTATFS_FREEBSD12 445 //sys Fsync(fd int) (err error) 446 //sys Ftruncate(fd int, length int64) (err error) 447 //sys getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) 448 //sys getdirentries_freebsd12(fd int, buf []byte, basep *uint64) (n int, err error) = _SYS_GETDIRENTRIES_FREEBSD12 449 //sys Getdtablesize() (size int) 450 //sysnb Getegid() (egid int) 451 //sysnb Geteuid() (uid int) 452 //sysnb Getgid() (gid int) 453 //sysnb Getpgid(pid int) (pgid int, err error) 454 //sysnb Getpgrp() (pgrp int) 455 //sysnb Getpid() (pid int) 456 //sysnb Getppid() (ppid int) 457 //sys Getpriority(which int, who int) (prio int, err error) 458 //sysnb Getrlimit(which int, lim *Rlimit) (err error) 459 //sysnb Getrusage(who int, rusage *Rusage) (err error) 460 //sysnb Getsid(pid int) (sid int, err error) 461 //sysnb Gettimeofday(tv *Timeval) (err error) 462 //sysnb Getuid() (uid int) 463 //sys Issetugid() (tainted bool) 464 //sys Kill(pid int, signum Signal) (err error) 465 //sys Kqueue() (fd int, err error) 466 //sys Lchown(path string, uid int, gid int) (err error) 467 //sys Link(path string, link string) (err error) 468 //sys Listen(s int, backlog int) (err error) 469 //sys lstat(path string, stat *stat_freebsd11_t) (err error) 470 //sys Mkdir(path string, mode uint32) (err error) 471 //sys Mkfifo(path string, mode uint32) (err error) 472 //sys mknod(path string, mode uint32, dev int) (err error) 473 //sys mknodat_freebsd12(fd int, path string, mode uint32, dev uint64) (err error) = _SYS_MKNODAT_FREEBSD12 474 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error) 475 //sys Open(path string, mode int, perm uint32) (fd int, err error) 476 //sys Pathconf(path string, name int) (val int, err error) 477 //sys Pread(fd int, p []byte, offset int64) (n int, err error) 478 //sys Pwrite(fd int, p []byte, offset int64) (n int, err error) 479 //sys read(fd int, p []byte) (n int, err error) 480 //sys Readlink(path string, buf []byte) (n int, err error) 481 //sys Rename(from string, to string) (err error) 482 //sys Revoke(path string) (err error) 483 //sys Rmdir(path string) (err error) 484 //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK 485 //sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) 486 //sysnb Setegid(egid int) (err error) 487 //sysnb Seteuid(euid int) (err error) 488 //sysnb Setgid(gid int) (err error) 489 //sys Setlogin(name string) (err error) 490 //sysnb Setpgid(pid int, pgid int) (err error) 491 //sys Setpriority(which int, who int, prio int) (err error) 492 //sysnb Setregid(rgid int, egid int) (err error) 493 //sysnb Setreuid(ruid int, euid int) (err error) 494 //sysnb Setrlimit(which int, lim *Rlimit) (err error) 495 //sysnb Setsid() (pid int, err error) 496 //sysnb Settimeofday(tp *Timeval) (err error) 497 //sysnb Setuid(uid int) (err error) 498 //sys stat(path string, stat *stat_freebsd11_t) (err error) 499 //sys statfs(path string, stat *statfs_freebsd11_t) (err error) 500 //sys statfs_freebsd12(path string, stat *Statfs_t) (err error) = _SYS_STATFS_FREEBSD12 501 //sys Symlink(path string, link string) (err error) 502 //sys Sync() (err error) 503 //sys Truncate(path string, length int64) (err error) 504 //sys Umask(newmask int) (oldmask int) 505 //sys Undelete(path string) (err error) 506 //sys Unlink(path string) (err error) 507 //sys Unmount(path string, flags int) (err error) 508 //sys write(fd int, p []byte) (n int, err error) 509 //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) 510 //sys munmap(addr uintptr, length uintptr) (err error) 511 //sys readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ 512 //sys writelen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_WRITE 513 //sys accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error) 514 //sys utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error) 515 //sys getcwd(buf []byte) (n int, err error) = SYS___GETCWD 516 //sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL