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      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 *
     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
     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
    133 di_dli_openr(char *path)
    134 {
    135 	return (di_dli_open(path, O_RDONLY, F_RDLCK, DLI_NAME));
    136 }
    137 
    138 
    139 int
    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
    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