1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2001 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <unistd.h> 23 #include <string.h> 24 #include <ctype.h> 25 #include <errno.h> 26 #include <sys/types.h> 27 #include <sys/stat.h> 28 #include <fcntl.h> 29 #include <sys/ioctl.h> 30 #include <linux/kd.h> 31 #include <linux/errno.h> 32 33 #include "nlsTest.h" 34 35 int open_block_device(void); 36 37 int block_dev_handle = 0; /* handle to nls test block device */ 38 39 int main(int argc, char **argv) 40 { 41 42 nlsdev_cmd_t cmd = { 0, 0 }; 43 int rc; 44 45 rc = open_block_device(); 46 47 if (!rc) { 48 49 block_dev_handle = open(DEVICE_NAME, O_RDWR); 50 51 if (block_dev_handle < 0) { 52 printf 53 ("ERROR: Open of device %s failed %d errno = %d\n", 54 DEVICE_NAME, block_dev_handle, errno); 55 } else { 56 rc = ioctl(block_dev_handle, NLSDEV_CMD, &cmd); 57 58 printf("return from ioctl %d \n", rc); 59 } 60 61 } else { 62 printf("ERROR: Create/open block device failed\n"); 63 } 64 65 return 0; 66 } 67 68 int open_block_device() 69 { 70 dev_t devt; 71 struct stat statbuf; 72 int rc; 73 74 if (block_dev_handle == 0) { 75 76 /* check for the /dev/ subdir, and create if it does not exist. 77 * 78 * If devfs is running and mounted on /dev, these checks will all pass, 79 * so a new node will not be created. 80 */ 81 82 devt = makedev(NLSMAJOR, 0); 83 84 rc = stat(NLS_DEVICE_PATH, &statbuf); 85 86 if (rc) { 87 if (errno == ENOENT) { 88 /* dev node does not exist. */ 89 rc = mkdir(NLS_DEVICE_PATH, (S_IFDIR | S_IRWXU | 90 S_IRGRP | S_IXGRP | 91 S_IROTH | 92 S_IXOTH)); 93 94 } else { 95 printf 96 ("ERROR: Problem with INC dev directory. Error code from stat() " 97 "is %d\n\n", errno); 98 } 99 } else { 100 if (!(statbuf.st_mode & S_IFDIR)) { 101 rc = unlink(NLS_DEVICE_PATH); 102 if (!rc) { 103 rc = mkdir(NLS_DEVICE_PATH, 104 (S_IFDIR | S_IRWXU | S_IRGRP 105 | S_IXGRP | S_IROTH | 106 S_IXOTH)); 107 } 108 } 109 } 110 111 /* 112 * Check for the block_device node, and create if it does not 113 * exist. 114 */ 115 116 rc = stat(DEVICE_NAME, &statbuf); 117 if (rc) { 118 if (errno == ENOENT) { 119 /* dev node does not exist */ 120 rc = mknod(DEVICE_NAME, 121 (S_IFBLK | S_IRUSR | S_IWUSR | 122 S_IRGRP | S_IWGRP), devt); 123 } else { 124 printf 125 ("ERROR:Problem with block device node directory. Error code form stat() is %d\n\n", 126 errno); 127 } 128 129 } else { 130 /* 131 * Device exists. Check to make sure it is for a 132 * block device and that it has the right major and minor. 133 */ 134 135 if ((!(statbuf.st_mode & S_IFBLK)) || 136 (statbuf.st_rdev != devt)) { 137 /* Recreate the dev node. */ 138 rc = unlink(DEVICE_NAME); 139 if (!rc) { 140 rc = mknod(DEVICE_NAME, 141 (S_IFBLK | S_IRUSR | S_IWUSR 142 | S_IRGRP | S_IWGRP), devt); 143 } 144 } 145 } 146 147 } 148 return rc; 149 } 150
