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
fallocate_errno(int fd)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
posix_fallocate(int fd,off_t offset,off_t len)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
posix_fallocate64(int fd,off64_t offset,off64_t len)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
107