diff options
Diffstat (limited to '')
-rw-r--r-- | cpukit/libcsupport/src/ftruncate.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/ftruncate.c b/cpukit/libcsupport/src/ftruncate.c new file mode 100644 index 0000000000..7fb2286531 --- /dev/null +++ b/cpukit/libcsupport/src/ftruncate.c @@ -0,0 +1,60 @@ +/* + * ftruncate() - Truncate a File to the Specified Length + * + * 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 <unistd.h> +#include <errno.h> + +#include "libio_.h" + +int ftruncate( + int fd, + off_t length +) +{ + rtems_libio_t *iop; + rtems_filesystem_location_info_t loc; + + /* + * If this is not a file system based entity, it is an error. + */ + + if ( rtems_file_descriptor_type( fd ) ) + set_errno_and_return_minus_one( EBADF ); + + /* + * Now process the ftruncate() request. + */ + + iop = rtems_libio_iop( fd ); + + /* + * Make sure we are not working on a directory + */ + + loc = iop->pathinfo; + if ( !loc.ops->node_type ) + set_errno_and_return_minus_one( ENOTSUP ); + + if ( (*loc.ops->node_type)( &loc ) == RTEMS_FILESYSTEM_DIRECTORY ) + set_errno_and_return_minus_one( EISDIR ); + + rtems_libio_check_fd( fd ); + rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE ); + + if ( !iop->handlers->ftruncate ) + set_errno_and_return_minus_one( ENOTSUP ); + + return (*iop->handlers->ftruncate)( iop, length ); +} + |