critical impact:

libaio, libaio_raw - POSIX AIO support is in librt (CrCh361)

Problem description

The POSIX 1003.1b Asynchronous I/O (AIO) interfaces are in the libaio and libaio_raw libraries on Tru64 UNIX; they are in the librt library on HP-UX.

The POSIX AIO interfaces allow a process or thread to start multiple simultaneous read and/or write operations to multiple files, to wait for or obtain notification of completion of requested operations, and to retrieve the status of completed operations.

On Tru64 UNIX, the POSIX AIO interfaces are in the libaio and libaio_raw libraries. The libaio library is for performing asynchronous I/O to files. The library uses POSIX threads to simulate the asynchronous I/O. The libaio_raw library is for raw devices that directly support true asynchronous I/O.

On HP-UX, the POSIX AIO interfaces are in the librt library. They support both files and raw devices. The implementation resides entirely within the kernel and uses kernel threads to simulate asynchronous I/O for devices that do not directly support it.

Identifiers

-laio	libaio.so
-laio_raw	libaio_raw.so

See also

• Background information on libraries impacts

• Tru64 UNIX Guide to Realtime Programming

Solution description

Applications that call the POSIX AIO interfaces should link with -lrt on HP-UX.

See also

• aio(5)

Problem summary