forked from Imagelibrary/rtems
93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
/**
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* @file
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*
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* @ingroup libcsupport
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*
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* @brief POSIX 1003.1b 6.3.1 - Close a File
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*/
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/*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/libio_.h>
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int close(
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int fd
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)
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{
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rtems_libio_t *iop;
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unsigned int flags;
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int rc;
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if ( (uint32_t) fd >= rtems_libio_number_iops ) {
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rtems_set_errno_and_return_minus_one( EBADF );
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}
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iop = rtems_libio_iop( fd );
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flags = rtems_libio_iop_flags( iop );
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while ( true ) {
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unsigned int desired;
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bool success;
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if ( ( flags & LIBIO_FLAGS_OPEN ) == 0 ) {
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rtems_set_errno_and_return_minus_one( EBADF );
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}
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/* The expected flags */
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flags &= LIBIO_FLAGS_REFERENCE_INC - 1U;
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desired = flags & ~LIBIO_FLAGS_OPEN;
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success = _Atomic_Compare_exchange_uint(
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&iop->flags,
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&flags,
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desired,
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ATOMIC_ORDER_ACQ_REL,
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ATOMIC_ORDER_RELAXED
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);
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if ( success ) {
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break;
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}
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if ( ( flags & ~( LIBIO_FLAGS_REFERENCE_INC - 1U ) ) != 0 ) {
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rtems_set_errno_and_return_minus_one( EBUSY );
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}
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}
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rc = (*iop->pathinfo.handlers->close_h)( iop );
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rtems_libio_free( iop );
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return rc;
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}
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/*
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* _close_r
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*
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* This is the Newlib dependent reentrant version of close().
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*/
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#if defined(RTEMS_NEWLIB) && !defined(HAVE__CLOSE_R)
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#include <reent.h>
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int _close_r(
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struct _reent *ptr RTEMS_UNUSED,
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int fd
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)
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{
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return close( fd );
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}
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#endif
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