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/*
* This file contains the support infrastructure used to manage the
* table of integer style file descriptors used by the low level
* POSIX system calls like open(), read, fstat(), etc.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rtems.h>
#include <rtems/libio_.h>
#include <rtems/assoc.h>
/* define this to alias O_NDELAY to O_NONBLOCK, i.e.,
* O_NDELAY is accepted on input but fcntl(F_GETFL) returns
* O_NONBLOCK. This is because rtems has no distinction
* between the two (but some systems have).
* Note that accepting this alias creates a problem:
* an application trying to clear the non-blocking flag
* using a
*
* fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NDELAY);
*
* does (silently) ignore the operation.
*/
#undef ACCEPT_O_NDELAY_ALIAS
/*
* rtems_libio_fcntl_flags
*
* Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand
*/
static const rtems_assoc_t access_modes_assoc[] = {
{ "READ", LIBIO_FLAGS_READ, O_RDONLY },
{ "WRITE", LIBIO_FLAGS_WRITE, O_WRONLY },
{ "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR },
{ 0, 0, 0 },
};
static const rtems_assoc_t status_flags_assoc[] = {
#ifdef ACCEPT_O_NDELAY_ALIAS
{ "NO DELAY", LIBIO_FLAGS_NO_DELAY, O_NDELAY },
#endif
{ "NONBLOCK", LIBIO_FLAGS_NO_DELAY, O_NONBLOCK },
{ "APPEND", LIBIO_FLAGS_APPEND, O_APPEND },
{ "CREATE", LIBIO_FLAGS_CREATE, O_CREAT },
{ 0, 0, 0 },
};
uint32_t rtems_libio_fcntl_flags( int fcntl_flags )
{
uint32_t flags = 0;
uint32_t access_modes;
/*
* Access mode is a small integer
*/
access_modes = (uint32_t) (fcntl_flags & O_ACCMODE);
fcntl_flags &= ~O_ACCMODE;
flags = rtems_assoc_local_by_remote( access_modes_assoc, access_modes );
/*
* Everything else is single bits
*/
flags |= rtems_assoc_local_by_remote_bitfield(
status_flags_assoc,
(uint32_t) fcntl_flags
);
return flags;
}
/*
* rtems_libio_to_fcntl_flags
*
* Convert RTEMS internal flags to UNIX fnctl(2) flags
*/
int rtems_libio_to_fcntl_flags( uint32_t flags )
{
int fcntl_flags = 0;
if ( (flags & LIBIO_FLAGS_READ_WRITE) == LIBIO_FLAGS_READ_WRITE ) {
fcntl_flags |= O_RDWR;
} else if ( (flags & LIBIO_FLAGS_READ) == LIBIO_FLAGS_READ) {
fcntl_flags |= O_RDONLY;
} else if ( (flags & LIBIO_FLAGS_WRITE) == LIBIO_FLAGS_WRITE) {
fcntl_flags |= O_WRONLY;
}
if ( (flags & LIBIO_FLAGS_NO_DELAY) == LIBIO_FLAGS_NO_DELAY ) {
fcntl_flags |= O_NONBLOCK;
}
if ( (flags & LIBIO_FLAGS_APPEND) == LIBIO_FLAGS_APPEND ) {
fcntl_flags |= O_APPEND;
}
if ( (flags & LIBIO_FLAGS_CREATE) == LIBIO_FLAGS_CREATE ) {
fcntl_flags |= O_CREAT;
}
return fcntl_flags;
}
/*
* rtems_libio_allocate
*
* This routine searches the IOP Table for an unused entry. If it
* finds one, it returns it. Otherwise, it returns NULL.
*/
rtems_libio_t *rtems_libio_allocate( void )
{
rtems_libio_t *iop, *next;
rtems_status_code rc;
rtems_id sema;
rtems_libio_lock();
if (rtems_libio_iop_freelist) {
rc = rtems_semaphore_create(
RTEMS_LIBIO_IOP_SEM(rtems_libio_iop_freelist - rtems_libio_iops),
1,
RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY,
0,
&sema
);
if (rc != RTEMS_SUCCESSFUL)
goto failed;
iop = rtems_libio_iop_freelist;
next = iop->data1;
(void) memset( iop, 0, sizeof(rtems_libio_t) );
iop->flags = LIBIO_FLAGS_OPEN;
iop->sem = sema;
rtems_libio_iop_freelist = next;
goto done;
}
failed:
iop = 0;
done:
rtems_libio_unlock();
return iop;
}
/*
* rtems_libio_free
*
* This routine frees the resources associated with an IOP (file descriptor)
* and clears the slot in the IOP Table.
*/
void rtems_libio_free(
rtems_libio_t *iop
)
{
rtems_filesystem_location_free( &iop->pathinfo );
rtems_libio_lock();
if (iop->sem)
rtems_semaphore_delete(iop->sem);
iop->flags &= ~LIBIO_FLAGS_OPEN;
iop->data1 = rtems_libio_iop_freelist;
rtems_libio_iop_freelist = iop;
rtems_libio_unlock();
}
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