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/*
* write() - POSIX 1003.1b 6.4.2 - Write to a File
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include "libio_.h"
/*
* write
*
* This routine writes count bytes from from buffer pointed to by buffer
* to the file associated with the open file descriptor, fildes.
*/
/* XXX newlib has the prototype for this wrong. It will be a bit painful */
/* XXX to fix so we are choosing to delay fixing this. */
int write( /* XXX this should return a ssize_t */
int fd,
const void *buffer,
unsigned32 count /* XXX this should be a size_t */
)
{
rtems_status_code rc;
rtems_libio_t *iop;
/*
* If this file descriptor is mapped to an external set of handlers,
* then pass the request on to them.
*/
if ( rtems_file_descriptor_type( fd ) ) {
rtems_libio_write_t fp;
fp = rtems_libio_handlers[rtems_file_descriptor_type_index(fd)].write;
if ( fp == NULL )
set_errno_and_return_minus_one( EBADF );
return (*fp)( fd, buffer, count );
}
/*
* Now process the write() request.
*/
iop = rtems_libio_iop( fd );
rtems_libio_check_fd( fd );
rtems_libio_check_buffer( buffer );
rtems_libio_check_count( count );
rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );
if ( !iop->handlers->write )
set_errno_and_return_minus_one( ENOTSUP );
rc = (*iop->handlers->write)( iop, buffer, count );
if ( rc > 0 )
iop->offset += rc;
return rc;
}
/*
* _write_r
*
* This is the Newlib dependent reentrant version of write().
*/
#if defined(RTEMS_NEWLIB)
#include <reent.h>
long _write_r(
struct _reent *ptr,
int fd,
const void *buf,
size_t nbytes
)
{
return write( fd, buf, nbytes );
}
#endif
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