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 2006 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/*
30 * Interfaces for getting device configuration data from kernel
31 * through the devinfo driver.
32 */
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <strings.h>
38#include <fcntl.h>
39#include <unistd.h>
40#include <sys/stat.h>
41#include <sys/types.h>
42#include <stdarg.h>
43#include <unistd.h>
44#include <libgen.h>
45#include "libdevinfo.h"
46
47/* Function Prototypes */
48static int di_dli_open(char *, int, short, int);
49
50#define	DLI_NAME	0x1
51
52/*
53 * Private hotplug interfaces to be used between cfgadm pci plugin and
54 * devfsadm link generator.
55 */
56
57
58/*
59 * returns a devlink info file name derived from <path>
60 * callers need to free the returned string
61 */
62char *
63di_dli_name(char *path)
64{
65#define	dliroot		"/etc/devices/dli/info."
66#define	dliroot_len	(sizeof (dliroot) - 1)
67
68	char *dlipath;
69	int dlipathsz;
70	char *basep;
71
72	basep = basename(path);
73	dlipathsz = strlen(basep) + dliroot_len + 1;
74	dlipath = malloc(sizeof (char) * dlipathsz);
75
76	(void) snprintf(dlipath, dlipathsz, "%s%s", dliroot, basep);
77	dlipath[dlipathsz - 1] = '\0';
78	return (dlipath);
79
80#undef	dlipre
81#undef	dlipre_len
82#undef	dliroot
83#undef	dliroot_len
84}
85
86
87static int
88di_dli_open(char *path, int oflag, short l_type, int flags)
89{
90	int fd;
91	char *dlipath, *dlipath_dir, *dlipath_dup;
92	struct stat statbuf;
93	int mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
94	flock_t lock;
95
96	dlipath = (flags & DLI_NAME) ? di_dli_name(path) : (char *)path;
97	dlipath_dup = strdup(dlipath);
98	dlipath_dir = dirname(dlipath_dup);
99
100	if (stat(dlipath_dir, &statbuf) < 0) {
101		if (mkdirp(dlipath_dir,
102		    S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
103			fd = -1;
104			goto OUT;
105		}
106	}
107
108	fd = open(dlipath, oflag, mode);
109	if (fd < 0)
110		goto OUT;
111
112	if (fchmod(fd, mode) < 0) {
113		(void) close(fd);
114		fd = -1;
115		goto OUT;
116	}
117
118	bzero(&lock, sizeof (lock));
119	lock.l_type = l_type;
120	if (fcntl(fd, F_SETLKW, &lock) < 0) {
121		(void) close(fd);
122		fd = -1;
123	}
124OUT:
125	free(dlipath_dup);
126	if (flags & DLI_NAME)
127		free(dlipath);
128	return (fd);
129}
130
131
132int
133di_dli_openr(char *path)
134{
135	return (di_dli_open(path, O_RDONLY, F_RDLCK, DLI_NAME));
136}
137
138
139int
140di_dli_openw(char *path)
141{
142	return (di_dli_open(path, O_RDWR | O_SYNC | O_TRUNC | O_CREAT,
143	    F_WRLCK, DLI_NAME));
144}
145
146
147void
148di_dli_close(int fd)
149{
150	flock_t lock;
151	if (fd < 0)
152		return;
153
154	bzero(&lock, sizeof (lock));
155	lock.l_type = F_UNLCK;
156	(void) fcntl(fd, F_SETLK, &lock);
157	(void) close(fd);
158}
159