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 */
48 static 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  */
62 char *
di_dli_name(char * path)63 di_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 
87 static int
di_dli_open(char * path,int oflag,short l_type,int flags)88 di_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 	}
124 OUT:
125 	free(dlipath_dup);
126 	if (flags & DLI_NAME)
127 		free(dlipath);
128 	return (fd);
129 }
130 
131 
132 int
di_dli_openr(char * path)133 di_dli_openr(char *path)
134 {
135 	return (di_dli_open(path, O_RDONLY, F_RDLCK, DLI_NAME));
136 }
137 
138 
139 int
di_dli_openw(char * path)140 di_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 
147 void
di_dli_close(int fd)148 di_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