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(5) 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(5), standards(5)

SunOS 5.11							    10 Sep 2004 						      uio.h(3HEAD)