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Diffstat (limited to 'src/syscall/syscall_darwin.go')
| -rw-r--r-- | src/syscall/syscall_darwin.go | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/src/syscall/syscall_darwin.go b/src/syscall/syscall_darwin.go new file mode 100644 index 0000000..a9639e3 --- /dev/null +++ b/src/syscall/syscall_darwin.go @@ -0,0 +1,335 @@ +// Copyright 2009,2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Darwin system calls. +// This file is compiled as ordinary Go code, +// but it is also input to mksyscall, +// which parses the //sys lines and generates system call stubs. +// Note that sometimes we use a lowercase //sys name and wrap +// it in our own nicer implementation, either here or in +// syscall_bsd.go or syscall_unix.go. + +package syscall + +import ( + "internal/abi" + "unsafe" +) + +func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) +func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) +func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) +func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) + +var dupTrampoline = abi.FuncPCABI0(libc_dup2_trampoline) + +type SockaddrDatalink struct { + Len uint8 + Family uint8 + Index uint16 + Type uint8 + Nlen uint8 + Alen uint8 + Slen uint8 + Data [12]int8 + raw RawSockaddrDatalink +} + +// Translate "kern.hostname" to []_C_int{0,1,2,3}. +func nametomib(name string) (mib []_C_int, err error) { + const siz = unsafe.Sizeof(mib[0]) + + // NOTE(rsc): It seems strange to set the buffer to have + // size CTL_MAXNAME+2 but use only CTL_MAXNAME + // as the size. I don't know why the +2 is here, but the + // kernel uses +2 for its own implementation of this function. + // I am scared that if we don't include the +2 here, the kernel + // will silently write 2 words farther than we specify + // and we'll get memory corruption. + var buf [CTL_MAXNAME + 2]_C_int + n := uintptr(CTL_MAXNAME) * siz + + p := (*byte)(unsafe.Pointer(&buf[0])) + bytes, err := ByteSliceFromString(name) + if err != nil { + return nil, err + } + + // Magic sysctl: "setting" 0.3 to a string name + // lets you read back the array of integers form. + if err = sysctl([]_C_int{0, 3}, p, &n, &bytes[0], uintptr(len(name))); err != nil { + return nil, err + } + return buf[0 : n/siz], nil +} + +func direntIno(buf []byte) (uint64, bool) { + return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino)) +} + +func direntReclen(buf []byte) (uint64, bool) { + return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen)) +} + +func direntNamlen(buf []byte) (uint64, bool) { + return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen)) +} + +func PtraceAttach(pid int) (err error) { return ptrace(PT_ATTACH, pid, 0, 0) } +func PtraceDetach(pid int) (err error) { return ptrace(PT_DETACH, pid, 0, 0) } + +//sysnb pipe(p *[2]int32) (err error) + +func Pipe(p []int) (err error) { + if len(p) != 2 { + return EINVAL + } + var q [2]int32 + err = pipe(&q) + if err == nil { + p[0] = int(q[0]) + p[1] = int(q[1]) + } + return +} + +func Getfsstat(buf []Statfs_t, flags int) (n int, err error) { + var _p0 unsafe.Pointer + var bufsize uintptr + if len(buf) > 0 { + _p0 = unsafe.Pointer(&buf[0]) + bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf)) + } + r0, _, e1 := syscall(abi.FuncPCABI0(libc_getfsstat_trampoline), uintptr(_p0), bufsize, uintptr(flags)) + n = int(r0) + if e1 != 0 { + err = e1 + } + return +} + +func libc_getfsstat_trampoline() + +//go:cgo_import_dynamic libc_getfsstat getfsstat "/usr/lib/libSystem.B.dylib" + +//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) + +/* + * Wrapped + */ + +//sys kill(pid int, signum int, posix int) (err error) + +func Kill(pid int, signum Signal) (err error) { return kill(pid, int(signum), 1) } + +/* + * Exposed directly + */ +//sys Access(path string, mode uint32) (err error) +//sys Adjtime(delta *Timeval, olddelta *Timeval) (err error) +//sys Chdir(path string) (err error) +//sys Chflags(path string, flags int) (err error) +//sys Chmod(path string, mode uint32) (err error) +//sys Chown(path string, uid int, gid int) (err error) +//sys Chroot(path string) (err error) +//sys Close(fd int) (err error) +//sys closedir(dir uintptr) (err error) +//sys Dup(fd int) (nfd int, err error) +//sys Dup2(from int, to int) (err error) +//sys Exchangedata(path1 string, path2 string, options int) (err error) +//sys Fchdir(fd int) (err error) +//sys Fchflags(fd int, flags int) (err error) +//sys Fchmod(fd int, mode uint32) (err error) +//sys Fchown(fd int, uid int, gid int) (err error) +//sys Flock(fd int, how int) (err error) +//sys Fpathconf(fd int, name int) (val int, err error) +//sys Fsync(fd int) (err error) +// Fsync is not called for os.File.Sync(). Please see internal/poll/fd_fsync_darwin.go +//sys Ftruncate(fd int, length int64) (err error) +//sys Getdtablesize() (size int) +//sysnb Getegid() (egid int) +//sysnb Geteuid() (uid int) +//sysnb Getgid() (gid int) +//sysnb Getpgid(pid int) (pgid int, err error) +//sysnb Getpgrp() (pgrp int) +//sysnb Getpid() (pid int) +//sysnb Getppid() (ppid int) +//sys Getpriority(which int, who int) (prio int, err error) +//sysnb Getrlimit(which int, lim *Rlimit) (err error) +//sysnb Getrusage(who int, rusage *Rusage) (err error) +//sysnb Getsid(pid int) (sid int, err error) +//sysnb Getuid() (uid int) +//sysnb Issetugid() (tainted bool) +//sys Kqueue() (fd int, err error) +//sys Lchown(path string, uid int, gid int) (err error) +//sys Link(path string, link string) (err error) +//sys Listen(s int, backlog int) (err error) +//sys Mkdir(path string, mode uint32) (err error) +//sys Mkfifo(path string, mode uint32) (err error) +//sys Mknod(path string, mode uint32, dev int) (err error) +//sys Mlock(b []byte) (err error) +//sys Mlockall(flags int) (err error) +//sys Mprotect(b []byte, prot int) (err error) +//sys msync(b []byte, flags int) (err error) +//sys Munlock(b []byte) (err error) +//sys Munlockall() (err error) +//sys Open(path string, mode int, perm uint32) (fd int, err error) +//sys Pathconf(path string, name int) (val int, err error) +//sys pread(fd int, p []byte, offset int64) (n int, err error) +//sys pwrite(fd int, p []byte, offset int64) (n int, err error) +//sys read(fd int, p []byte) (n int, err error) +//sys readdir_r(dir uintptr, entry *Dirent, result **Dirent) (res Errno) +//sys Readlink(path string, buf []byte) (n int, err error) +//sys Rename(from string, to string) (err error) +//sys Revoke(path string) (err error) +//sys Rmdir(path string) (err error) +//sys Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_lseek +//sys Select(n int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (err error) +//sys Setegid(egid int) (err error) +//sysnb Seteuid(euid int) (err error) +//sysnb Setgid(gid int) (err error) +//sys Setlogin(name string) (err error) +//sysnb Setpgid(pid int, pgid int) (err error) +//sys Setpriority(which int, who int, prio int) (err error) +//sys Setprivexec(flag int) (err error) +//sysnb Setregid(rgid int, egid int) (err error) +//sysnb Setreuid(ruid int, euid int) (err error) +//sysnb setrlimit(which int, lim *Rlimit) (err error) +//sysnb Setsid() (pid int, err error) +//sysnb Settimeofday(tp *Timeval) (err error) +//sysnb Setuid(uid int) (err error) +//sys Symlink(path string, link string) (err error) +//sys Sync() (err error) +//sys Truncate(path string, length int64) (err error) +//sys Umask(newmask int) (oldmask int) +//sys Undelete(path string) (err error) +//sys Unlink(path string) (err error) +//sys Unmount(path string, flags int) (err error) +//sys write(fd int, p []byte) (n int, err error) +//sys writev(fd int, iovecs []Iovec) (cnt uintptr, err error) +//sys mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) +//sys munmap(addr uintptr, length uintptr) (err error) +//sysnb fork() (pid int, err error) +//sysnb ioctl(fd int, req int, arg int) (err error) +//sysnb ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_ioctl +//sysnb execve(path *byte, argv **byte, envp **byte) (err error) +//sysnb exit(res int) (err error) +//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) +//sys fcntlPtr(fd int, cmd int, arg unsafe.Pointer) (val int, err error) = SYS_fcntl +//sys unlinkat(fd int, path string, flags int) (err error) +//sys openat(fd int, path string, flags int, perm uint32) (fdret int, err error) +//sys getcwd(buf []byte) (n int, err error) + +func init() { + execveDarwin = execve +} + +func fdopendir(fd int) (dir uintptr, err error) { + r0, _, e1 := syscallPtr(abi.FuncPCABI0(libc_fdopendir_trampoline), uintptr(fd), 0, 0) + dir = r0 + if e1 != 0 { + err = errnoErr(e1) + } + return +} + +func libc_fdopendir_trampoline() + +//go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib" + +func readlen(fd int, buf *byte, nbuf int) (n int, err error) { + r0, _, e1 := syscall(abi.FuncPCABI0(libc_read_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf)) + n = int(r0) + if e1 != 0 { + err = errnoErr(e1) + } + return +} + +func writelen(fd int, buf *byte, nbuf int) (n int, err error) { + r0, _, e1 := syscall(abi.FuncPCABI0(libc_write_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf)) + n = int(r0) + if e1 != 0 { + err = errnoErr(e1) + } + return +} + +func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) { + // Simulate Getdirentries using fdopendir/readdir_r/closedir. + // We store the number of entries to skip in the seek + // offset of fd. See issue #31368. + // It's not the full required semantics, but should handle the case + // of calling Getdirentries or ReadDirent repeatedly. + // It won't handle assigning the results of lseek to *basep, or handle + // the directory being edited underfoot. + skip, err := Seek(fd, 0, 1 /* SEEK_CUR */) + if err != nil { + return 0, err + } + + // We need to duplicate the incoming file descriptor + // because the caller expects to retain control of it, but + // fdopendir expects to take control of its argument. + // Just Dup'ing the file descriptor is not enough, as the + // result shares underlying state. Use openat to make a really + // new file descriptor referring to the same directory. + fd2, err := openat(fd, ".", O_RDONLY, 0) + if err != nil { + return 0, err + } + d, err := fdopendir(fd2) + if err != nil { + Close(fd2) + return 0, err + } + defer closedir(d) + + var cnt int64 + for { + var entry Dirent + var entryp *Dirent + e := readdir_r(d, &entry, &entryp) + if e != 0 { + return n, errnoErr(e) + } + if entryp == nil { + break + } + if skip > 0 { + skip-- + cnt++ + continue + } + reclen := int(entry.Reclen) + if reclen > len(buf) { + // Not enough room. Return for now. + // The counter will let us know where we should start up again. + // Note: this strategy for suspending in the middle and + // restarting is O(n^2) in the length of the directory. Oh well. + break + } + // Copy entry into return buffer. + copy(buf, unsafe.Slice((*byte)(unsafe.Pointer(&entry)), reclen)) + buf = buf[reclen:] + n += reclen + cnt++ + } + // Set the seek offset of the input fd to record + // how many files we've already returned. + _, err = Seek(fd, cnt, 0 /* SEEK_SET */) + if err != nil { + return n, err + } + + return n, nil +} + +// Implemented in the runtime package (runtime/sys_darwin.go) +func syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) +func syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) +func syscall6X(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) +func rawSyscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) +func rawSyscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) +func syscallPtr(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) |