sys-iounit man page on Inferno

sys-iounit man page on Inferno

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SYS-IOUNIT(2)							 SYS-IOUNIT(2)

NAME
       iounit - return size of atomic I/O unit for file descriptor

SYNOPSIS
       include "sys.m";
       sys := load Sys Sys->PATH;

       iounit:	 fn(fd: ref FD): int;

DESCRIPTION
       Reads  and  writes  of files are transmitted using the 9P protocol (see
       intro(5)) and in general, operations involving large  amounts  of  data
       must  be	 broken into smaller pieces by the operating system.  The `I/O
       unit' associated with each file descriptor records the maximum size, in
       bytes, that may be read or written without breaking up the transfer.

       The  iounit system call returns the I/O unit size for the open file fd.
       Certain file descriptors, particularly those associated	with  devices,
       may have no specific I/O unit, in which case iounit will return zero.

SOURCE
       /emu/port/inferno.c
       /os/port/inferno.c

SEE ALSO
       sys-dup(2), read(5)

DIAGNOSTICS
       Returns	zero  if any error occurs or if the I/O unit size of the fd is
       unspecified or unknown.

								 SYS-IOUNIT(2)

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