xref: /illumos-gate/usr/src/lib/libc/port/gen/posix_fallocate.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
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 #include "lint.h"
28 #include <fcntl.h>
29 #include <errno.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 
33 /*
34  * Return the proper Posix error number for a failed (EINVAL) fcntl() operation.
35  */
36 static int
fallocate_errno(int fd)37 fallocate_errno(int fd)
38 {
39 	struct stat64 statb;
40 	int error;
41 
42 	if (fstat64(fd, &statb) != 0)		/* can't happen? */
43 		error = EBADF;
44 	else if (S_ISFIFO(statb.st_mode))	/* pipe or FIFO */
45 		error = ESPIPE;
46 	else if (!S_ISREG(statb.st_mode))	/* not a regular file */
47 		error = ENODEV;
48 	else			/* the file system doesn't support F_ALLOCSP */
49 		error = EINVAL;
50 
51 	return (error);
52 }
53 
54 int
posix_fallocate(int fd,off_t offset,off_t len)55 posix_fallocate(int fd, off_t offset, off_t len)
56 {
57 	struct flock lck;
58 	int error;
59 
60 	if (offset < 0 || len <= 0)
61 		return (EINVAL);
62 
63 	lck.l_whence = 0;
64 	lck.l_start = offset;
65 	lck.l_len = len;
66 	lck.l_type = F_WRLCK;
67 
68 	if (fcntl(fd, F_ALLOCSP, &lck) == -1) {
69 		if ((error = errno) == EINVAL)
70 			error = fallocate_errno(fd);
71 		else if (error == EOVERFLOW)
72 			error = EFBIG;
73 		return (error);
74 	}
75 	return (0);
76 }
77 
78 #if !defined(_LP64)
79 
80 int
posix_fallocate64(int fd,off64_t offset,off64_t len)81 posix_fallocate64(int fd, off64_t offset, off64_t len)
82 {
83 	struct flock64 lck;
84 	int error;
85 
86 	if (offset < 0 || len <= 0)
87 		return (EINVAL);
88 
89 	lck.l_whence = 0;
90 	lck.l_start = offset;
91 	lck.l_len = len;
92 	lck.l_type = F_WRLCK;
93 
94 	if (fcntl(fd, F_ALLOCSP64, &lck) == -1) {
95 		if ((error = errno) == EINVAL)
96 			error = fallocate_errno(fd);
97 		else if (error == EOVERFLOW)
98 			error = EFBIG;
99 		return (error);
100 	}
101 	return (0);
102 }
103 
104 #endif
105