critical impact:

readv - different buffer capacity (CrCh97)

Problem description

The IOV_MAX constant used by the readv function has different values on Tru64 UNIX and HP-UX.

The readv function reads from a file. On Tru64 UNIX, the </usr/include/limits.h> header file defines IOV_MAX as having the value 1024. On HP-UX, IOV_MAX is defined as having the value 16. The third parameter, iov_count on Tru64 UNIX and iovcnt on HP-UX, is valid if greater than zero and less or equal to IOV_MAX. This might cause problems in applications that use a value of IOV_MAX greater than 16.

Identifiers

IOV_MAX

See also

• Background information on capacity scaling and limits issues impacts
• Background information on Input/Output (files, devices) impacts
• Background information on kernel impacts
• readv(2)

Solution description

Review the applicable manpages and your code to determine if your code has dependencies on the value.

See also

• readv(2)

Problem summary