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 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <ctype.h> 31 #include <string.h> 32 #include <limits.h> 33 #include <sys/types.h> 34 #include <svm.h> 35 36 /* 37 * Macros to produce a quoted string containing the value of a 38 * preprocessor macro. For example, if SIZE is defined to be 256, 39 * VAL2STR(SIZE) is "256". This is used to construct format 40 * strings for scanf-family functions below. 41 */ 42 #define QUOTE(x) #x 43 #define VAL2STR(x) QUOTE(x) 44 45 static int is_blank(char *); 46 47 /* 48 * is_blank() returns 1 (true) if a line specified is composed of 49 * whitespace characters only. otherwise, it returns 0 (false). 50 * 51 * Note. the argument (line) must be null-terminated. 52 */ 53 static int 54 is_blank(char *line) 55 { 56 for (/* nothing */; *line != '\0'; line++) 57 if (!isspace(*line)) 58 return (0); 59 return (1); 60 } 61 62 /* 63 * FUNCTION: 64 * Return the driver name for a major number 65 * 66 * INPUT: major number, mount point for name_to_major file, pointer 67 * to a valid buffer. 68 * 69 * RETURN VALUES: 70 * 0 - SUCCESS - buf contain the driver name. 71 * -1 - FAIL 72 * 73 */ 74 75 int 76 get_drv_name(major_t major, char *mnt, char *buf) 77 { 78 FILE *fp; 79 char drv[FILENAME_MAX + 1]; 80 char entry[FILENAME_MAX + 1]; 81 char line[MAX_N2M_ALIAS_LINE], *cp; 82 char fname[PATH_MAX]; 83 84 int status = RET_NOERROR; 85 (void) snprintf(fname, sizeof (fname), "%s%s", mnt, NAME_TO_MAJOR); 86 87 if ((fp = fopen(fname, "r")) == NULL) { 88 return (RET_ERROR); 89 } 90 91 while ((fgets(line, sizeof (line), fp) != NULL) && 92 status == RET_NOERROR) { 93 /* cut off comments starting with '#' */ 94 if ((cp = strchr(line, '#')) != NULL) 95 *cp = '\0'; 96 /* ignore comment or blank lines */ 97 if (is_blank(line)) 98 continue; 99 /* sanity-check */ 100 if (sscanf(line, 101 "%" VAL2STR(FILENAME_MAX) "s %" VAL2STR(FILENAME_MAX) "s", 102 drv, entry) != 2) { 103 status = RET_ERROR; 104 } 105 if (atoi(entry) == major) 106 break; 107 } 108 109 if (status == RET_NOERROR) 110 (void) strcpy(buf, drv); 111 (void) fclose(fp); 112 return (status); 113 } 114