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[smlnj] View of /sml/branches/num64/runtime/c-libs/posix-filesys/ftruncate_64.c
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View of /sml/branches/num64/runtime/c-libs/posix-filesys/ftruncate_64.c

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Revision 5219 - (download) (as text) (annotate)
Thu May 30 13:17:43 2019 UTC (2 months, 3 weeks ago) by jhr
File size: 776 byte(s)
  Switch 64-bit versions of Posix FileSys and IO operations to directly
  pass 64-bit integers to/from the runtime (instead of using two 32-bit
  words).  Have also changed the representation of file timestamps
  to a 64-bit number of nanoseconds (instead of 32-bit seconds).
  The plan is to make these versions the default.
/* ftruncate_64.c
 *
 *   Version of ftruncate with 64-positions passed as pair of 32-bit values.
 *
 * COPYRIGHT (c) 2019 The Fellowship of SML/NJ (http://www.smlnj.org)
 * All rights reserved.
 */

#include "ml-unixdep.h"
#include "ml-objects.h"
#include "ml-c.h"
#include "cfun-proto-list.h"
#include <sys/types.h>
#include <sys/stat.h>

/* _ml_P_FileSys_ftruncate_64 : (int * Position.int) -> unit
 *
 * Truncate or extend a file to a specified length
 */
ml_val_t _ml_P_FileSys_ftruncate_64 (ml_state_t *msp, ml_val_t arg)
{
    int		fd = REC_SELINT(arg, 0);
    ml_val_t	boxed_len = REC_SELINT(arg, 1);
    off_t	len = (off_t)INT64_MLtoC(boxed_len);
    int		sts;

    sts = ftruncate (fd, len);

    CHK_RETURN_UNIT(msp, sts)

} /* end of _ml_P_FileSys_ftruncate_64 */

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