usr/src/lib/libc/port/gen/posix_fadvise.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "lint.h"
  30 #include <fcntl.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <errno.h>
  34
  35 /*
  36  * SUSv3 - file advisory information
  37  *
  38  * This function does nothing, but that's OK because the
  39  * Posix specification doesn't require it to do anything
  40  * other than return appropriate error numbers.
  41  *
  42  * In the future, a file system dependent fadvise() or fcntl()
  43  * interface, similar to madvise(), should be developed to enable
  44  * the kernel to optimize I/O operations based on the given advice.
  45  */
  46
  47 /* ARGSUSED1 */
  48 int
  49 posix_fadvise(int fd, off_t offset, off_t len, int advice)
  50 {
  51         struct stat64 statb;
  52
  53         switch (advice) {
  54         case POSIX_FADV_NORMAL:
  55         case POSIX_FADV_RANDOM:
  56         case POSIX_FADV_SEQUENTIAL:
  57         case POSIX_FADV_WILLNEED:
  58         case POSIX_FADV_DONTNEED:
  59         case POSIX_FADV_NOREUSE:
  60                 break;
  61         default:
  62                 return (EINVAL);
  63         }
  64         if (len < 0)
  65                 return (EINVAL);
  66         if (fstat64(fd, &statb) != 0)
  67                 return (EBADF);
  68         if (S_ISFIFO(statb.st_mode))
  69                 return (ESPIPE);
  70         return (0);
  71 }
  72
  73 #if !defined(_LP64)
  74
  75 /* ARGSUSED1 */
  76 int
  77 posix_fadvise64(int fd, off64_t offset, off64_t len, int advice)
  78 {
  79         struct stat64 statb;
  80
  81         switch (advice) {
  82         case POSIX_FADV_NORMAL:
  83         case POSIX_FADV_RANDOM:
  84         case POSIX_FADV_SEQUENTIAL:
  85         case POSIX_FADV_WILLNEED:
  86         case POSIX_FADV_DONTNEED:
  87         case POSIX_FADV_NOREUSE:
  88                 break;
  89         default:
  90                 return (EINVAL);
  91         }
  92         if (len < 0)
  93                 return (EINVAL);
  94         if (fstat64(fd, &statb) != 0)
  95                 return (EBADF);
  96         if (S_ISFIFO(statb.st_mode))
  97                 return (ESPIPE);
  98         return (0);
  99 }
 100
 101 #endif