usr/src/lib/libc/port/gen/posix_fallocate.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 <errno.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34
  35 /*
  36  * Return the proper Posix error number for a failed (EINVAL) fcntl() operation.
  37  */
  38 static int
  39 fallocate_errno(int fd)
  40 {
  41         struct stat64 statb;
  42         int error;
  43
  44         if (fstat64(fd, &statb) != 0)           /* can't happen? */
  45                 error = EBADF;
  46         else if (S_ISFIFO(statb.st_mode))       /* pipe or FIFO */
  47                 error = ESPIPE;
  48         else if (!S_ISREG(statb.st_mode))       /* not a regular file */
  49                 error = ENODEV;
  50         else                    /* the file system doesn't support F_ALLOCSP */
  51                 error = EINVAL;
  52
  53         return (error);
  54 }
  55
  56 int
  57 posix_fallocate(int fd, off_t offset, off_t len)
  58 {
  59         struct flock lck;
  60         int error;
  61
  62         if (offset < 0 || len <= 0)
  63                 return (EINVAL);
  64
  65         lck.l_whence = 0;
  66         lck.l_start = offset;
  67         lck.l_len = len;
  68         lck.l_type = F_WRLCK;
  69
  70         if (fcntl(fd, F_ALLOCSP, &lck) == -1) {
  71                 if ((error = errno) == EINVAL)
  72                         error = fallocate_errno(fd);
  73                 else if (error == EOVERFLOW)
  74                         error = EFBIG;
  75                 return (error);
  76         }
  77         return (0);
  78 }
  79
  80 #if !defined(_LP64)
  81
  82 int
  83 posix_fallocate64(int fd, off64_t offset, off64_t len)
  84 {
  85         struct flock64 lck;
  86         int error;
  87
  88         if (offset < 0 || len <= 0)
  89                 return (EINVAL);
  90
  91         lck.l_whence = 0;
  92         lck.l_start = offset;
  93         lck.l_len = len;
  94         lck.l_type = F_WRLCK;
  95
  96         if (fcntl(fd, F_ALLOCSP64, &lck) == -1) {
  97                 if ((error = errno) == EINVAL)
  98                         error = fallocate_errno(fd);
  99                 else if (error == EOVERFLOW)
 100                         error = EFBIG;
 101                 return (error);
 102         }
 103         return (0);
 104 }
 105
 106 #endif