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