syscall_freebsd.go raw
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 unix
14
15 import (
16 "errors"
17 "sync"
18 "unsafe"
19 )
20
21 // See https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html.
22 var (
23 osreldateOnce sync.Once
24 osreldate uint32
25 )
26
27 func supportsABI(ver uint32) bool {
28 osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })
29 return osreldate >= ver
30 }
31
32 // SockaddrDatalink implements the Sockaddr interface for AF_LINK type sockets.
33 type SockaddrDatalink struct {
34 Len uint8
35 Family uint8
36 Index uint16
37 Type uint8
38 Nlen uint8
39 Alen uint8
40 Slen uint8
41 Data [46]int8
42 raw RawSockaddrDatalink
43 }
44
45 func anyToSockaddrGOOS(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
46 return nil, EAFNOSUPPORT
47 }
48
49 // Translate "kern.hostname" to []_C_int{0,1,2,3}.
50 func nametomib(name string) (mib []_C_int, err error) {
51 const siz = unsafe.Sizeof(mib[0])
52
53 // NOTE(rsc): It seems strange to set the buffer to have
54 // size CTL_MAXNAME+2 but use only CTL_MAXNAME
55 // as the size. I don't know why the +2 is here, but the
56 // kernel uses +2 for its own implementation of this function.
57 // I am scared that if we don't include the +2 here, the kernel
58 // will silently write 2 words farther than we specify
59 // and we'll get memory corruption.
60 var buf [CTL_MAXNAME + 2]_C_int
61 n := uintptr(CTL_MAXNAME) * siz
62
63 p := (*byte)(unsafe.Pointer(&buf[0]))
64 bytes, err := ByteSliceFromString(name)
65 if err != nil {
66 return nil, err
67 }
68
69 // Magic sysctl: "setting" 0.3 to a string name
70 // lets you read back the array of integers form.
71 if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil {
72 return nil, err
73 }
74 return buf[0 : n/siz], nil
75 }
76
77 func direntIno(buf []byte) (uint64, bool) {
78 return readInt(buf, unsafe.Offsetof(Dirent{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno))
79 }
80
81 func direntReclen(buf []byte) (uint64, bool) {
82 return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
83 }
84
85 func direntNamlen(buf []byte) (uint64, bool) {
86 return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
87 }
88
89 func Pipe(p []int) (err error) {
90 return Pipe2(p, 0)
91 }
92
93 //sysnb pipe2(p *[2]_C_int, flags int) (err error)
94
95 func Pipe2(p []int, flags int) error {
96 if len(p) != 2 {
97 return EINVAL
98 }
99 var pp [2]_C_int
100 err := pipe2(&pp, flags)
101 if err == nil {
102 p[0] = int(pp[0])
103 p[1] = int(pp[1])
104 }
105 return err
106 }
107
108 func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
109 var value IPMreqn
110 vallen := _Socklen(SizeofIPMreqn)
111 errno := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
112 return &value, errno
113 }
114
115 func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
116 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), unsafe.Sizeof(*mreq))
117 }
118
119 // GetsockoptXucred is a getsockopt wrapper that returns an Xucred struct.
120 // The usual level and opt are SOL_LOCAL and LOCAL_PEERCRED, respectively.
121 func GetsockoptXucred(fd, level, opt int) (*Xucred, error) {
122 x := new(Xucred)
123 vallen := _Socklen(SizeofXucred)
124 err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen)
125 return x, err
126 }
127
128 func Accept4(fd, flags int) (nfd int, sa Sockaddr, err error) {
129 var rsa RawSockaddrAny
130 var len _Socklen = SizeofSockaddrAny
131 nfd, err = accept4(fd, &rsa, &len, flags)
132 if err != nil {
133 return
134 }
135 if len > SizeofSockaddrAny {
136 panic("RawSockaddrAny too small")
137 }
138 sa, err = anyToSockaddr(fd, &rsa)
139 if err != nil {
140 Close(nfd)
141 nfd = 0
142 }
143 return
144 }
145
146 //sys Getcwd(buf []byte) (n int, err error) = SYS___GETCWD
147
148 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
149 var (
150 _p0 unsafe.Pointer
151 bufsize uintptr
152 )
153 if len(buf) > 0 {
154 _p0 = unsafe.Pointer(&buf[0])
155 bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))
156 }
157 r0, _, e1 := Syscall(SYS_GETFSSTAT, uintptr(_p0), bufsize, uintptr(flags))
158 n = int(r0)
159 if e1 != 0 {
160 err = e1
161 }
162 return
163 }
164
165 //sys ioctl(fd int, req uint, arg uintptr) (err error) = SYS_IOCTL
166 //sys ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL
167
168 //sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL
169
170 func Uname(uname *Utsname) error {
171 mib := []_C_int{CTL_KERN, KERN_OSTYPE}
172 n := unsafe.Sizeof(uname.Sysname)
173 // Suppress ENOMEM errors to be compatible with the C library __xuname() implementation.
174 if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
175 return err
176 }
177
178 mib = []_C_int{CTL_KERN, KERN_HOSTNAME}
179 n = unsafe.Sizeof(uname.Nodename)
180 if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
181 return err
182 }
183
184 mib = []_C_int{CTL_KERN, KERN_OSRELEASE}
185 n = unsafe.Sizeof(uname.Release)
186 if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
187 return err
188 }
189
190 mib = []_C_int{CTL_KERN, KERN_VERSION}
191 n = unsafe.Sizeof(uname.Version)
192 if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
193 return err
194 }
195
196 // The version might have newlines or tabs in it, convert them to
197 // spaces.
198 for i, b := range uname.Version {
199 if b == '\n' || b == '\t' {
200 if i == len(uname.Version)-1 {
201 uname.Version[i] = 0
202 } else {
203 uname.Version[i] = ' '
204 }
205 }
206 }
207
208 mib = []_C_int{CTL_HW, HW_MACHINE}
209 n = unsafe.Sizeof(uname.Machine)
210 if err := sysctl(mib, &uname.Machine[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
211 return err
212 }
213
214 return nil
215 }
216
217 func Stat(path string, st *Stat_t) (err error) {
218 return Fstatat(AT_FDCWD, path, st, 0)
219 }
220
221 func Lstat(path string, st *Stat_t) (err error) {
222 return Fstatat(AT_FDCWD, path, st, AT_SYMLINK_NOFOLLOW)
223 }
224
225 func Getdents(fd int, buf []byte) (n int, err error) {
226 return Getdirentries(fd, buf, nil)
227 }
228
229 func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
230 if basep == nil || unsafe.Sizeof(*basep) == 8 {
231 return getdirentries(fd, buf, (*uint64)(unsafe.Pointer(basep)))
232 }
233 // The syscall needs a 64-bit base. On 32-bit machines
234 // we can't just use the basep passed in. See #32498.
235 var base uint64 = uint64(*basep)
236 n, err = getdirentries(fd, buf, &base)
237 *basep = uintptr(base)
238 if base>>32 != 0 {
239 // We can't stuff the base back into a uintptr, so any
240 // future calls would be suspect. Generate an error.
241 // EIO is allowed by getdirentries.
242 err = EIO
243 }
244 return
245 }
246
247 func Mknod(path string, mode uint32, dev uint64) (err error) {
248 return Mknodat(AT_FDCWD, path, mode, dev)
249 }
250
251 func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
252 if raceenabled {
253 raceReleaseMerge(unsafe.Pointer(&ioSync))
254 }
255 return sendfile(outfd, infd, offset, count)
256 }
257
258 //sys ptrace(request int, pid int, addr uintptr, data int) (err error)
259 //sys ptracePtr(request int, pid int, addr unsafe.Pointer, data int) (err error) = SYS_PTRACE
260
261 func PtraceAttach(pid int) (err error) {
262 return ptrace(PT_ATTACH, pid, 0, 0)
263 }
264
265 func PtraceCont(pid int, signal int) (err error) {
266 return ptrace(PT_CONTINUE, pid, 1, signal)
267 }
268
269 func PtraceDetach(pid int) (err error) {
270 return ptrace(PT_DETACH, pid, 1, 0)
271 }
272
273 func PtraceGetFpRegs(pid int, fpregsout *FpReg) (err error) {
274 return ptracePtr(PT_GETFPREGS, pid, unsafe.Pointer(fpregsout), 0)
275 }
276
277 func PtraceGetRegs(pid int, regsout *Reg) (err error) {
278 return ptracePtr(PT_GETREGS, pid, unsafe.Pointer(regsout), 0)
279 }
280
281 func PtraceIO(req int, pid int, offs uintptr, out []byte, countin int) (count int, err error) {
282 ioDesc := PtraceIoDesc{
283 Op: int32(req),
284 Offs: offs,
285 }
286 if countin > 0 {
287 _ = out[:countin] // check bounds
288 ioDesc.Addr = &out[0]
289 } else if out != nil {
290 ioDesc.Addr = (*byte)(unsafe.Pointer(&_zero))
291 }
292 ioDesc.SetLen(countin)
293
294 err = ptracePtr(PT_IO, pid, unsafe.Pointer(&ioDesc), 0)
295 return int(ioDesc.Len), err
296 }
297
298 func PtraceLwpEvents(pid int, enable int) (err error) {
299 return ptrace(PT_LWP_EVENTS, pid, 0, enable)
300 }
301
302 func PtraceLwpInfo(pid int, info *PtraceLwpInfoStruct) (err error) {
303 return ptracePtr(PT_LWPINFO, pid, unsafe.Pointer(info), int(unsafe.Sizeof(*info)))
304 }
305
306 func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
307 return PtraceIO(PIOD_READ_D, pid, addr, out, SizeofLong)
308 }
309
310 func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
311 return PtraceIO(PIOD_READ_I, pid, addr, out, SizeofLong)
312 }
313
314 func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
315 return PtraceIO(PIOD_WRITE_D, pid, addr, data, SizeofLong)
316 }
317
318 func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
319 return PtraceIO(PIOD_WRITE_I, pid, addr, data, SizeofLong)
320 }
321
322 func PtraceSetRegs(pid int, regs *Reg) (err error) {
323 return ptracePtr(PT_SETREGS, pid, unsafe.Pointer(regs), 0)
324 }
325
326 func PtraceSingleStep(pid int) (err error) {
327 return ptrace(PT_STEP, pid, 1, 0)
328 }
329
330 func Dup3(oldfd, newfd, flags int) error {
331 if oldfd == newfd || flags&^O_CLOEXEC != 0 {
332 return EINVAL
333 }
334 how := F_DUP2FD
335 if flags&O_CLOEXEC != 0 {
336 how = F_DUP2FD_CLOEXEC
337 }
338 _, err := fcntl(oldfd, how, newfd)
339 return err
340 }
341
342 /*
343 * Exposed directly
344 */
345 //sys Access(path string, mode uint32) (err error)
346 //sys Adjtime(delta *Timeval, olddelta *Timeval) (err error)
347 //sys CapEnter() (err error)
348 //sys capRightsGet(version int, fd int, rightsp *CapRights) (err error) = SYS___CAP_RIGHTS_GET
349 //sys capRightsLimit(fd int, rightsp *CapRights) (err error)
350 //sys Chdir(path string) (err error)
351 //sys Chflags(path string, flags int) (err error)
352 //sys Chmod(path string, mode uint32) (err error)
353 //sys Chown(path string, uid int, gid int) (err error)
354 //sys Chroot(path string) (err error)
355 //sys ClockGettime(clockid int32, time *Timespec) (err error)
356 //sys Close(fd int) (err error)
357 //sys Dup(fd int) (nfd int, err error)
358 //sys Dup2(from int, to int) (err error)
359 //sys Exit(code int)
360 //sys ExtattrGetFd(fd int, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
361 //sys ExtattrSetFd(fd int, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
362 //sys ExtattrDeleteFd(fd int, attrnamespace int, attrname string) (err error)
363 //sys ExtattrListFd(fd int, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
364 //sys ExtattrGetFile(file string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
365 //sys ExtattrSetFile(file string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
366 //sys ExtattrDeleteFile(file string, attrnamespace int, attrname string) (err error)
367 //sys ExtattrListFile(file string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
368 //sys ExtattrGetLink(link string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
369 //sys ExtattrSetLink(link string, attrnamespace int, attrname string, data uintptr, nbytes int) (ret int, err error)
370 //sys ExtattrDeleteLink(link string, attrnamespace int, attrname string) (err error)
371 //sys ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
372 //sys Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_POSIX_FADVISE
373 //sys Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
374 //sys Fchdir(fd int) (err error)
375 //sys Fchflags(fd int, flags int) (err error)
376 //sys Fchmod(fd int, mode uint32) (err error)
377 //sys Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
378 //sys Fchown(fd int, uid int, gid int) (err error)
379 //sys Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
380 //sys Flock(fd int, how int) (err error)
381 //sys Fpathconf(fd int, name int) (val int, err error)
382 //sys Fstat(fd int, stat *Stat_t) (err error)
383 //sys Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
384 //sys Fstatfs(fd int, stat *Statfs_t) (err error)
385 //sys Fsync(fd int) (err error)
386 //sys Ftruncate(fd int, length int64) (err error)
387 //sys getdirentries(fd int, buf []byte, basep *uint64) (n int, err error)
388 //sys Getdtablesize() (size int)
389 //sysnb Getegid() (egid int)
390 //sysnb Geteuid() (uid int)
391 //sysnb Getgid() (gid int)
392 //sysnb Getpgid(pid int) (pgid int, err error)
393 //sysnb Getpgrp() (pgrp int)
394 //sysnb Getpid() (pid int)
395 //sysnb Getppid() (ppid int)
396 //sys Getpriority(which int, who int) (prio int, err error)
397 //sysnb Getrlimit(which int, lim *Rlimit) (err error)
398 //sysnb Getrusage(who int, rusage *Rusage) (err error)
399 //sysnb Getsid(pid int) (sid int, err error)
400 //sysnb Gettimeofday(tv *Timeval) (err error)
401 //sysnb Getuid() (uid int)
402 //sys Issetugid() (tainted bool)
403 //sys Kill(pid int, signum syscall.Signal) (err error)
404 //sys Kqueue() (fd int, err error)
405 //sys Lchown(path string, uid int, gid int) (err error)
406 //sys Link(path string, link string) (err error)
407 //sys Linkat(pathfd int, path string, linkfd int, link string, flags int) (err error)
408 //sys Listen(s int, backlog int) (err error)
409 //sys Mkdir(path string, mode uint32) (err error)
410 //sys Mkdirat(dirfd int, path string, mode uint32) (err error)
411 //sys Mkfifo(path string, mode uint32) (err error)
412 //sys Mknodat(fd int, path string, mode uint32, dev uint64) (err error)
413 //sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
414 //sys Open(path string, mode int, perm uint32) (fd int, err error)
415 //sys Openat(fdat int, path string, mode int, perm uint32) (fd int, err error)
416 //sys Pathconf(path string, name int) (val int, err error)
417 //sys pread(fd int, p []byte, offset int64) (n int, err error)
418 //sys pwrite(fd int, p []byte, offset int64) (n int, err error)
419 //sys read(fd int, p []byte) (n int, err error)
420 //sys Readlink(path string, buf []byte) (n int, err error)
421 //sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
422 //sys Rename(from string, to string) (err error)
423 //sys Renameat(fromfd int, from string, tofd int, to string) (err error)
424 //sys Revoke(path string) (err error)
425 //sys Rmdir(path string) (err error)
426 //sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK
427 //sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
428 //sysnb Setegid(egid int) (err error)
429 //sysnb Seteuid(euid int) (err error)
430 //sysnb Setgid(gid int) (err error)
431 //sys Setlogin(name string) (err error)
432 //sysnb Setpgid(pid int, pgid int) (err error)
433 //sys Setpriority(which int, who int, prio int) (err error)
434 //sysnb Setregid(rgid int, egid int) (err error)
435 //sysnb Setreuid(ruid int, euid int) (err error)
436 //sysnb Setresgid(rgid int, egid int, sgid int) (err error)
437 //sysnb Setresuid(ruid int, euid int, suid int) (err error)
438 //sysnb Setsid() (pid int, err error)
439 //sysnb Settimeofday(tp *Timeval) (err error)
440 //sysnb Setuid(uid int) (err error)
441 //sys Statfs(path string, stat *Statfs_t) (err error)
442 //sys Symlink(path string, link string) (err error)
443 //sys Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
444 //sys Sync() (err error)
445 //sys Truncate(path string, length int64) (err error)
446 //sys Umask(newmask int) (oldmask int)
447 //sys Undelete(path string) (err error)
448 //sys Unlink(path string) (err error)
449 //sys Unlinkat(dirfd int, path string, flags int) (err error)
450 //sys Unmount(path string, flags int) (err error)
451 //sys write(fd int, p []byte) (n int, err error)
452 //sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
453 //sys munmap(addr uintptr, length uintptr) (err error)
454 //sys accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
455 //sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
456