xref: /illumos-gate/usr/src/lib/libc/port/gen/posix_fadvise.c (revision 4a38094c1dd4980a3761849bfbdf92ae62c568f5)
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 <sys/types.h>
30 #include <sys/stat.h>
31 #include <errno.h>
32 
33 /*
34  * SUSv3 - file advisory information
35  *
36  * This function does nothing, but that's OK because the
37  * Posix specification doesn't require it to do anything
38  * other than return appropriate error numbers.
39  *
40  * In the future, a file system dependent fadvise() or fcntl()
41  * interface, similar to madvise(), should be developed to enable
42  * the kernel to optimize I/O operations based on the given advice.
43  */
44 
45 int
posix_fadvise(int fd,off_t offset __unused,off_t len,int advice)46 posix_fadvise(int fd, off_t offset __unused, off_t len, int advice)
47 {
48 	struct stat64 statb;
49 
50 	switch (advice) {
51 	case POSIX_FADV_NORMAL:
52 	case POSIX_FADV_RANDOM:
53 	case POSIX_FADV_SEQUENTIAL:
54 	case POSIX_FADV_WILLNEED:
55 	case POSIX_FADV_DONTNEED:
56 	case POSIX_FADV_NOREUSE:
57 		break;
58 	default:
59 		return (EINVAL);
60 	}
61 	if (len < 0)
62 		return (EINVAL);
63 	if (fstat64(fd, &statb) != 0)
64 		return (EBADF);
65 	if (S_ISFIFO(statb.st_mode))
66 		return (ESPIPE);
67 	return (0);
68 }
69 
70 #if !defined(_LP64)
71 
72 int
posix_fadvise64(int fd,off64_t offset __unused,off64_t len,int advice)73 posix_fadvise64(int fd, off64_t offset __unused, off64_t len, int advice)
74 {
75 	struct stat64 statb;
76 
77 	switch (advice) {
78 	case POSIX_FADV_NORMAL:
79 	case POSIX_FADV_RANDOM:
80 	case POSIX_FADV_SEQUENTIAL:
81 	case POSIX_FADV_WILLNEED:
82 	case POSIX_FADV_DONTNEED:
83 	case POSIX_FADV_NOREUSE:
84 		break;
85 	default:
86 		return (EINVAL);
87 	}
88 	if (len < 0)
89 		return (EINVAL);
90 	if (fstat64(fd, &statb) != 0)
91 		return (EBADF);
92 	if (S_ISFIFO(statb.st_mode))
93 		return (ESPIPE);
94 	return (0);
95 }
96 
97 #endif
98