Originální popis anglicky:
sys/uio.h - definitions for vector I/O operations
Návod, kniha: POSIX Programmer's Manual
#include <sys/uio.h>
The
<sys/uio.h> header shall define the
iovec structure that
includes at least the following members:
void *iov_base Base address of a memory region for input or output.
size_t iov_len The 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 shall be defined as described in
<sys/types.h>.
The following shall be declared as functions and may also be defined as macros.
Function prototypes shall be provided.
ssize_t readv(int, const struct iovec *, int);
ssize_t writev(int, const struct iovec *, int);
The following sections are informative.
The implementation can put a limit on the number of scatter/gather elements
which can be processed in one call. The symbol {IOV_MAX} defined in
<limits.h> should always be used to learn about the limits
instead of assuming a fixed value.
Traditionally, the maximum number of scatter/gather elements the system can
process in one call were described by the symbolic value {UIO_MAXIOV}. In
IEEE Std 1003.1-2001 this value is replaced by the constant
{IOV_MAX} which can be found in
<limits.h>.
None.
<limits.h> ,
<sys/types.h> , the System Interfaces
volume of IEEE Std 1003.1-2001,
read(),
write()
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
