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// Copyright 2023 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. package poll import ( "sync/atomic" "syscall" "unsafe" ) type SysFile struct { // RefCountPtr is a pointer to the reference count of Sysfd. // // WASI preview 1 lacks a dup(2) system call. When the os and net packages // need to share a file/socket, instead of duplicating the underlying file // descriptor, we instead provide a way to copy FD instances and manage the // underlying file descriptor with reference counting. RefCountPtr *int32 // RefCount is the reference count of Sysfd. When a copy of an FD is made, // it points to the reference count of the original FD instance. RefCount int32 // Cache for the file type, lazily initialized when Seek is called. Filetype uint32 // If the file represents a directory, this field contains the current // readdir position. It is reset to zero if the program calls Seek(0, 0). Dircookie uint64 // Absolute path of the file, as returned by syscall.PathOpen; // this is used by Fchdir to emulate setting the current directory // to an open file descriptor. Path string // TODO(achille): it could be meaningful to move isFile from FD to a method // on this struct type, and expose it as `IsFile() bool` which derives the // result from the Filetype field. We would need to ensure that Filetype is // always set instead of being lazily initialized. } func (s *SysFile) init() { if s.RefCountPtr == nil { s.RefCount = 1 s.RefCountPtr = &s.RefCount } } func (s *SysFile) ref() SysFile { atomic.AddInt32(s.RefCountPtr, +1) return SysFile{RefCountPtr: s.RefCountPtr} } func (s *SysFile) destroy(fd int) error { if s.RefCountPtr != nil && atomic.AddInt32(s.RefCountPtr, -1) > 0 { return nil } // We don't use ignoringEINTR here because POSIX does not define // whether the descriptor is closed if close returns EINTR. // If the descriptor is indeed closed, using a loop would race // with some other goroutine opening a new descriptor. // (The Linux kernel guarantees that it is closed on an EINTR error.) return CloseFunc(fd) } // Copy creates a copy of the FD. // // The FD instance points to the same underlying file descriptor. The file // descriptor isn't closed until all FD instances that refer to it have been // closed/destroyed. func (fd *FD) Copy() FD { return FD{ Sysfd: fd.Sysfd, SysFile: fd.SysFile.ref(), IsStream: fd.IsStream, ZeroReadIsEOF: fd.ZeroReadIsEOF, isBlocking: fd.isBlocking, isFile: fd.isFile, } } // dupCloseOnExecOld always errors on wasip1 because there is no mechanism to // duplicate file descriptors. func dupCloseOnExecOld(fd int) (int, string, error) { return -1, "dup", syscall.ENOSYS } // Fchdir wraps syscall.Fchdir. func (fd *FD) Fchdir() error { if err := fd.incref(); err != nil { return err } defer fd.decref() return syscall.Chdir(fd.Path) } // ReadDir wraps syscall.ReadDir. // We treat this like an ordinary system call rather than a call // that tries to fill the buffer. func (fd *FD) ReadDir(buf []byte, cookie syscall.Dircookie) (int, error) { if err := fd.incref(); err != nil { return 0, err } defer fd.decref() for { n, err := syscall.ReadDir(fd.Sysfd, buf, cookie) if err != nil { n = 0 if err == syscall.EAGAIN && fd.pd.pollable() { if err = fd.pd.waitRead(fd.isFile); err == nil { continue } } } // Do not call eofError; caller does not expect to see io.EOF. return n, err } } func (fd *FD) ReadDirent(buf []byte) (int, error) { n, err := fd.ReadDir(buf, fd.Dircookie) if err != nil { return 0, err } if n <= 0 { return n, nil // EOF } // We assume that the caller of ReadDirent will consume the entire buffer // up to the last full entry, so we scan through the buffer looking for the // value of the last next cookie. b := buf[:n] for len(b) > 0 { next, ok := direntNext(b) if !ok { break } size, ok := direntReclen(b) if !ok { break } if size > uint64(len(b)) { break } fd.Dircookie = syscall.Dircookie(next) b = b[size:] } // Trim a potentially incomplete trailing entry; this is necessary because // the code in src/os/dir_unix.go does not deal well with partial values in // calls to direntReclen, etc... and ends up causing an early EOF before all // directory entries were consumed. ReadDirent is called with a large enough // buffer (8 KiB) that at least one entry should always fit, tho this seems // a bit brittle but cannot be addressed without a large change of the // algorithm in the os.(*File).readdir method. return n - len(b), nil } // Seek wraps syscall.Seek. func (fd *FD) Seek(offset int64, whence int) (int64, error) { if err := fd.incref(); err != nil { return 0, err } defer fd.decref() // syscall.Filetype is a uint8 but we store it as a uint32 in SysFile in // order to use atomic load/store on the field, which is why we have to // perform this type conversion. fileType := syscall.Filetype(atomic.LoadUint32(&fd.Filetype)) if fileType == syscall.FILETYPE_UNKNOWN { var stat syscall.Stat_t if err := fd.Fstat(&stat); err != nil { return 0, err } fileType = stat.Filetype atomic.StoreUint32(&fd.Filetype, uint32(fileType)) } if fileType == syscall.FILETYPE_DIRECTORY { // If the file descriptor is opened on a directory, we reset the readdir // cookie when seeking back to the beginning to allow reusing the file // descriptor to scan the directory again. if offset == 0 && whence == 0 { fd.Dircookie = 0 return 0, nil } else { return 0, syscall.EINVAL } } return syscall.Seek(fd.Sysfd, offset, whence) } // https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md#-dirent-record const sizeOfDirent = 24 func direntReclen(buf []byte) (uint64, bool) { namelen, ok := direntNamlen(buf) return sizeOfDirent + namelen, ok } func direntNamlen(buf []byte) (uint64, bool) { return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Namlen), unsafe.Sizeof(syscall.Dirent{}.Namlen)) } func direntNext(buf []byte) (uint64, bool) { return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Next), unsafe.Sizeof(syscall.Dirent{}.Next)) } // readInt returns the size-bytes unsigned integer in native byte order at offset off. func readInt(b []byte, off, size uintptr) (u uint64, ok bool) { if len(b) < int(off+size) { return 0, false } return readIntLE(b[off:], size), true } func readIntLE(b []byte, size uintptr) uint64 { switch size { case 1: return uint64(b[0]) case 2: _ = b[1] // bounds check hint to compiler; see golang.org/issue/14808 return uint64(b[0]) | uint64(b[1])<<8 case 4: _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808 return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 case 8: _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808 return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 | uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56 default: panic("internal/poll: readInt with unsupported size") } }