diff options
Diffstat (limited to 'libgo/go/os/file_unix.go')
| -rw-r--r-- | libgo/go/os/file_unix.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libgo/go/os/file_unix.go b/libgo/go/os/file_unix.go index 83158877ab9..5888d48f819 100644 --- a/libgo/go/os/file_unix.go +++ b/libgo/go/os/file_unix.go @@ -66,6 +66,10 @@ type file struct { // making it invalid; see runtime.SetFinalizer for more information on when // a finalizer might be run. On Unix systems this will cause the SetDeadline // methods to stop working. +// Because file descriptors can be reused, the returned file descriptor may +// only be closed through the Close method of f, or by its finalizer during +// garbage collection. Otherwise, during garbage collection the finalizer +// may close an unrelated file descriptor with the same (reused) number. // // As an alternative, see the f.SyscallConn method. func (f *File) Fd() uintptr { @@ -90,6 +94,10 @@ func (f *File) Fd() uintptr { // descriptor. On Unix systems, if the file descriptor is in // non-blocking mode, NewFile will attempt to return a pollable File // (one for which the SetDeadline methods work). +// +// After passing it to NewFile, fd may become invalid under the same +// conditions described in the comments of the Fd method, and the same +// constraints apply. func NewFile(fd uintptr, name string) *File { kind := kindNewFile if nb, err := unix.IsNonblock(int(fd)); err == nil && nb { |