UIO.H(3HEAD) Headers UIO.H(3HEAD)

NAME

uio.h, uio - definitions for vector I/O operations

SYNOPSIS

#include <sys/uio.h>

DESCRIPTION

The <sys/uio.h> header defines the iovec structure, which includes
the following members:

void *iov_base /* base address of a memory region
for input or output */
size_t iov_len /* size of the memory pointed to by
iov_base */


The <sys/uio.h> header uses the iovec structure for scatter/gather
I/O.


The ssize_t and size_t types are defined as described in
<sys/types.h>.

USAGE

The symbol {IOV_MAX} defined in <limits.h> should always be used to
learn about the limits on the number of scatter/gather elements that
can be processed in one call, instead of assuming a fixed value.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+

SEE ALSO

read(2), write(2), limits.h(3HEAD), types.h(3HEAD), attributes(7),
standards(7)

September 10, 2004 UIO.H(3HEAD)