I should have checked the docs for the underlying system call! Possible failure modes for read on this system:

EAGAIN
Non-blocking I/O has been selected using O_NONBLOCK and no data was immediately available for reading.
EBADF
fd is not a valid file descriptor or is not open for reading.
EFAULT
buf is outside your accessible address space.
EINTR
The call was interrupted by a signal before any data was read.
EINVAL
fd is attached to an object which is unsuitable for reading; or the file was opened with the O_DIRECT flag, and either the address specified in buf, the value specified in count, or the current file offset is not suitably aligned.
EIO
I/O error. This will happen for example when the process is in a background process group, tries to read from its controlling tty, and either it is ignoring or blocking SIGTTIN or its process group is orphaned. It may also occur when there is a low-level I/O error while reading from a disk or tape.
EISDIR
fd refers to a directory.

Using non-blocking IO might do the trick. Or maybe closing the underlying fd using POSIX::close.

In reply to Re: Generating a readline error by ikegami
in thread Generating a readline error by ikegami

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