srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 1 | // support.cc |
| 2 | // Non-class support functions for gdisk program. |
| 3 | // Primarily by Rod Smith, February 2009, but with a few functions |
| 4 | // copied from other sources (see attributions below). |
| 5 | |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 6 | /* This program is copyright (c) 2009 by Roderick W. Smith. It is distributed |
| 7 | under the terms of the GNU GPL version 2, as detailed in the COPYING file. */ |
| 8 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 9 | #define __STDC_LIMIT_MACROS |
| 10 | #define __STDC_CONSTANT_MACROS |
| 11 | |
| 12 | #include <sys/ioctl.h> |
| 13 | #include <stdio.h> |
| 14 | #include <string.h> |
| 15 | #include <stdint.h> |
| 16 | #include <errno.h> |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 17 | #include <fcntl.h> |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 18 | #include <sys/stat.h> |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 19 | #include "support.h" |
| 20 | |
| 21 | #include <sys/types.h> |
| 22 | |
| 23 | using namespace std; |
| 24 | |
| 25 | // Get a numeric value from the user, between low and high (inclusive). |
| 26 | // Keeps looping until the user enters a value within that range. |
| 27 | // If user provides no input, def (default value) is returned. |
| 28 | // (If def is outside of the low-high range, an explicit response |
| 29 | // is required.) |
| 30 | int GetNumber(int low, int high, int def, const char prompt[]) { |
| 31 | int response, num; |
| 32 | char line[255]; |
| 33 | |
| 34 | if (low != high) { // bother only if low and high differ... |
| 35 | response = low - 1; // force one loop by setting response outside range |
| 36 | while ((response < low) || (response > high)) { |
| 37 | printf(prompt); |
| 38 | fgets(line, 255, stdin); |
| 39 | num = sscanf(line, "%d", &response); |
| 40 | if (num == 1) { // user provided a response |
| 41 | if ((response < low) || (response > high)) |
| 42 | printf("Value out of range\n"); |
| 43 | } else { // user hit enter; return default |
| 44 | response = def; |
| 45 | } // if/else |
| 46 | } // while |
| 47 | } else { // low == high, so return this value |
| 48 | printf("Using %d\n", low); |
| 49 | response = low; |
| 50 | } // else |
| 51 | return (response); |
| 52 | } // GetNumber() |
| 53 | |
| 54 | // Gets a Y/N response (and converts lowercase to uppercase) |
| 55 | char GetYN(void) { |
| 56 | char line[255]; |
| 57 | char response = '\0'; |
| 58 | |
| 59 | while ((response != 'Y') && (response != 'N')) { |
| 60 | printf("(Y/N): "); |
| 61 | fgets(line, 255, stdin); |
| 62 | sscanf(line, "%c", &response); |
| 63 | if (response == 'y') response = 'Y'; |
| 64 | if (response == 'n') response = 'N'; |
| 65 | } // while |
| 66 | return response; |
| 67 | } // GetYN(void) |
| 68 | |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 69 | // Obtains a sector number, between low and high, from the |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 70 | // user, accepting values prefixed by "+" to add sectors to low, |
| 71 | // or the same with "K", "M", "G", or "T" as suffixes to add |
| 72 | // kilobytes, megabytes, gigabytes, or terabytes, respectively. |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 73 | // If a "-" prefix is used, use the high value minus the user- |
| 74 | // specified number of sectors (or KiB, MiB, etc.). Use the def |
| 75 | //value as the default if the user just hits Enter |
| 76 | uint64_t GetSectorNum(uint64_t low, uint64_t high, uint64_t def, char prompt[]) { |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 77 | unsigned long long response; |
| 78 | int num; |
| 79 | int plusFlag = 0; |
| 80 | uint64_t mult = 1; |
| 81 | char suffix; |
| 82 | char line[255]; |
| 83 | |
| 84 | response = low - 1; // Ensure one pass by setting a too-low initial value |
| 85 | while ((response < low) || (response > high)) { |
| 86 | printf(prompt); |
| 87 | fgets(line, 255, stdin); |
| 88 | |
| 89 | // Remove leading spaces, if present |
| 90 | while (line[0] == ' ') |
| 91 | strcpy(line, &line[1]); |
| 92 | |
| 93 | // If present, flag and remove leading plus sign |
| 94 | if (line[0] == '+') { |
| 95 | plusFlag = 1; |
| 96 | strcpy(line, &line[1]); |
| 97 | } // if |
| 98 | |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 99 | // If present, flag and remove leading minus sign |
| 100 | if (line[0] == '-') { |
| 101 | plusFlag = -1; |
| 102 | strcpy(line, &line[1]); |
| 103 | } // if |
| 104 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 105 | // Extract numeric response and, if present, suffix |
| 106 | num = sscanf(line, "%llu%c", &response, &suffix); |
| 107 | |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 108 | // If no response, use default (def) |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 109 | if (num <= 0) { |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 110 | response = (unsigned long long) def; |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 111 | suffix = ' '; |
srs5694 | e19ba09 | 2009-08-24 14:10:35 -0400 | [diff] [blame] | 112 | plusFlag = 0; |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 113 | } // if |
| 114 | |
| 115 | // Set multiplier based on suffix |
| 116 | switch (suffix) { |
| 117 | case 'K': |
| 118 | case 'k': |
| 119 | mult = (uint64_t) 1024 / SECTOR_SIZE; |
| 120 | break; |
| 121 | case 'M': |
| 122 | case 'm': |
| 123 | mult = (uint64_t) 1048576 / SECTOR_SIZE; |
| 124 | break; |
| 125 | case 'G': |
| 126 | case 'g': |
| 127 | mult = (uint64_t) 1073741824 / SECTOR_SIZE; |
| 128 | break; |
| 129 | case 'T': |
| 130 | case 't': |
| 131 | mult = ((uint64_t) 1073741824 * (uint64_t) 1024) / (uint64_t) SECTOR_SIZE; |
| 132 | break; |
| 133 | default: |
| 134 | mult = 1; |
| 135 | } // switch |
| 136 | |
| 137 | // Adjust response based on multiplier and plus flag, if present |
| 138 | response *= (unsigned long long) mult; |
| 139 | if (plusFlag == 1) { |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 140 | response = response + (unsigned long long) low - UINT64_C(1); |
| 141 | } // if |
| 142 | if (plusFlag == -1) { |
| 143 | response = (unsigned long long) high - response; |
srs5694 | e19ba09 | 2009-08-24 14:10:35 -0400 | [diff] [blame] | 144 | } // if |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 145 | } // while |
| 146 | return ((uint64_t) response); |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 147 | } // GetSectorNum() |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 148 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 149 | // Takes a size in bytes (in size) and converts this to a size in |
| 150 | // SI units (KiB, MiB, GiB, TiB, or PiB), returned in C++ string |
| 151 | // form |
| 152 | char* BytesToSI(uint64_t size, char theValue[]) { |
| 153 | char units[8]; |
| 154 | float sizeInSI; |
| 155 | |
| 156 | if (theValue != NULL) { |
| 157 | sizeInSI = (float) size; |
| 158 | strcpy (units, " bytes"); |
| 159 | if (sizeInSI > 1024.0) { |
| 160 | sizeInSI /= 1024.0; |
| 161 | strcpy(units, " KiB"); |
| 162 | } // if |
| 163 | if (sizeInSI > 1024.0) { |
| 164 | sizeInSI /= 1024.0; |
| 165 | strcpy(units, " MiB"); |
| 166 | } // if |
| 167 | if (sizeInSI > 1024.0) { |
| 168 | sizeInSI /= 1024.0; |
| 169 | strcpy(units, " GiB"); |
| 170 | } // if |
| 171 | if (sizeInSI > 1024.0) { |
| 172 | sizeInSI /= 1024.0; |
| 173 | strcpy(units, " TiB"); |
| 174 | } // if |
| 175 | if (sizeInSI > 1024.0) { |
| 176 | sizeInSI /= 1024.0; |
| 177 | strcpy(units, " PiB"); |
| 178 | } // if |
| 179 | if (strcmp(units, " bytes") == 0) { // in bytes, so no decimal point |
| 180 | sprintf(theValue, "%1.0f%s", sizeInSI, units); |
| 181 | } else { |
| 182 | sprintf(theValue, "%1.1f%s", sizeInSI, units); |
| 183 | } // if/else |
| 184 | } // if |
| 185 | return theValue; |
| 186 | } // BlocksToSI() |
| 187 | |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 188 | // Returns block size of device pointed to by fd file descriptor. If the ioctl |
| 189 | // returns an error condition, print a warning but return a value of SECTOR_SIZE |
| 190 | // (512).. |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 191 | int GetBlockSize(int fd) { |
| 192 | int err, result; |
| 193 | |
| 194 | #ifdef __APPLE__ |
| 195 | err = ioctl(fd, DKIOCGETBLOCKSIZE, &result); |
| 196 | #else |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 197 | #ifdef __FreeBSD__ |
| 198 | err = ioctl(fd, DIOCGSECTORSIZE, &result); |
| 199 | #else |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 200 | err = ioctl(fd, BLKSSZGET, &result); |
| 201 | #endif |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 202 | #endif |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 203 | |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 204 | if (err == -1) { |
| 205 | result = SECTOR_SIZE; |
| 206 | // ENOTTY = inappropriate ioctl; probably being called on a disk image |
| 207 | // file, so don't display the warning message.... |
| 208 | if (errno != ENOTTY) { |
| 209 | printf("\aError %d when determining sector size! Setting sector size to %d\n", |
| 210 | errno, SECTOR_SIZE); |
| 211 | } // if |
| 212 | } // if |
| 213 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 214 | if (result != 512) { |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 215 | printf("\aWARNING! Sector size is not 512 bytes! This program is likely to "); |
| 216 | printf("misbehave!\nProceed at your own risk!\n\n"); |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 217 | } // if |
| 218 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 219 | return (result); |
| 220 | } // GetBlockSize() |
| 221 | |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 222 | // Return a plain-text name for a partition type. |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 223 | // Convert a GUID to a string representation, suitable for display |
| 224 | // to humans.... |
| 225 | char* GUIDToStr(struct GUIDData theGUID, char* theString) { |
| 226 | uint64_t block; |
| 227 | |
| 228 | if (theString != NULL) { |
| 229 | block = (theGUID.data1 & UINT64_C(0x00000000FFFFFFFF)); |
| 230 | sprintf(theString, "%08llX-", (unsigned long long) block); |
| 231 | block = (theGUID.data1 & UINT64_C(0x0000FFFF00000000)) >> 32; |
| 232 | sprintf(theString, "%s%04llX-", theString, (unsigned long long) block); |
| 233 | block = (theGUID.data1 & UINT64_C(0xFFFF000000000000)) >> 48; |
| 234 | sprintf(theString, "%s%04llX-", theString, (unsigned long long) block); |
| 235 | block = (theGUID.data2 & UINT64_C(0x00000000000000FF)); |
| 236 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 237 | block = (theGUID.data2 & UINT64_C(0x000000000000FF00)) >> 8; |
| 238 | sprintf(theString, "%s%02llX-", theString, (unsigned long long) block); |
| 239 | block = (theGUID.data2 & UINT64_C(0x0000000000FF0000)) >> 16; |
| 240 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 241 | block = (theGUID.data2 & UINT64_C(0x00000000FF000000)) >> 24; |
| 242 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 243 | block = (theGUID.data2 & UINT64_C(0x000000FF00000000)) >> 32; |
| 244 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 245 | block = (theGUID.data2 & UINT64_C(0x0000FF0000000000)) >> 40; |
| 246 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 247 | block = (theGUID.data2 & UINT64_C(0x00FF000000000000)) >> 48; |
| 248 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 249 | block = (theGUID.data2 & UINT64_C(0xFF00000000000000)) >> 56; |
| 250 | sprintf(theString, "%s%02llX", theString, (unsigned long long) block); |
| 251 | } // if |
| 252 | return theString; |
| 253 | } // GUIDToStr() |
| 254 | |
| 255 | // Get a GUID from the user |
| 256 | GUIDData GetGUID(void) { |
| 257 | uint64_t part1, part2, part3, part4, part5; |
| 258 | int entered = 0; |
| 259 | char temp[255], temp2[255]; |
| 260 | GUIDData theGUID; |
| 261 | |
| 262 | printf("\nA GUID is entered in five segments of from two to six bytes, with\n" |
| 263 | "dashes between segments.\n"); |
| 264 | printf("Enter the entire GUID, a four-byte hexadecimal number for the first segment, or\n" |
| 265 | "'R' to generate the entire GUID randomly: "); |
| 266 | fgets(temp, 255, stdin); |
| 267 | |
| 268 | // If user entered 'r' or 'R', generate GUID randomly.... |
| 269 | if ((temp[0] == 'r') || (temp[0] == 'R')) { |
| 270 | theGUID.data1 = (uint64_t) rand() * (uint64_t) rand(); |
| 271 | theGUID.data2 = (uint64_t) rand() * (uint64_t) rand(); |
| 272 | entered = 1; |
| 273 | } // if user entered 'R' or 'r' |
| 274 | |
| 275 | // If string length is right for whole entry, try to parse it.... |
| 276 | if ((strlen(temp) == 37) && (entered == 0)) { |
| 277 | strncpy(temp2, &temp[0], 8); |
| 278 | temp2[8] = '\0'; |
| 279 | sscanf(temp2, "%llx", &part1); |
| 280 | strncpy(temp2, &temp[9], 4); |
| 281 | temp2[4] = '\0'; |
| 282 | sscanf(temp2, "%llx", &part2); |
| 283 | strncpy(temp2, &temp[14], 4); |
| 284 | temp2[4] = '\0'; |
| 285 | sscanf(temp2, "%llx", &part3); |
| 286 | theGUID.data1 = (part3 << 48) + (part2 << 32) + part1; |
| 287 | strncpy(temp2, &temp[19], 4); |
| 288 | temp2[4] = '\0'; |
| 289 | sscanf(temp2, "%llx", &part4); |
| 290 | strncpy(temp2, &temp[24], 12); |
| 291 | temp2[12] = '\0'; |
| 292 | sscanf(temp2, "%llx", &part5); |
| 293 | theGUID.data2 = ((part4 & UINT64_C(0x000000000000FF00)) >> 8) + |
| 294 | ((part4 & UINT64_C(0x00000000000000FF)) << 8) + |
| 295 | ((part5 & UINT64_C(0x0000FF0000000000)) >> 24) + |
| 296 | ((part5 & UINT64_C(0x000000FF00000000)) >> 8) + |
| 297 | ((part5 & UINT64_C(0x00000000FF000000)) << 8) + |
| 298 | ((part5 & UINT64_C(0x0000000000FF0000)) << 24) + |
| 299 | ((part5 & UINT64_C(0x000000000000FF00)) << 40) + |
| 300 | ((part5 & UINT64_C(0x00000000000000FF)) << 56); |
| 301 | entered = 1; |
| 302 | } // if |
| 303 | |
| 304 | // If neither of the above methods of entry was used, use prompted |
| 305 | // entry.... |
| 306 | if (entered == 0) { |
| 307 | sscanf(temp, "%llx", &part1); |
| 308 | printf("Enter a two-byte hexadecimal number for the second segment: "); |
| 309 | fgets(temp, 255, stdin); |
| 310 | sscanf(temp, "%llx", &part2); |
| 311 | printf("Enter a two-byte hexadecimal number for the third segment: "); |
| 312 | fgets(temp, 255, stdin); |
| 313 | sscanf(temp, "%llx", &part3); |
| 314 | theGUID.data1 = (part3 << 48) + (part2 << 32) + part1; |
| 315 | printf("Enter a two-byte hexadecimal number for the fourth segment: "); |
| 316 | fgets(temp, 255, stdin); |
| 317 | sscanf(temp, "%llx", &part4); |
| 318 | printf("Enter a six-byte hexadecimal number for the fifth segment: "); |
| 319 | fgets(temp, 255, stdin); |
| 320 | sscanf(temp, "%llx", &part5); |
| 321 | theGUID.data2 = ((part4 & UINT64_C(0x000000000000FF00)) >> 8) + |
| 322 | ((part4 & UINT64_C(0x00000000000000FF)) << 8) + |
| 323 | ((part5 & UINT64_C(0x0000FF0000000000)) >> 24) + |
| 324 | ((part5 & UINT64_C(0x000000FF00000000)) >> 8) + |
| 325 | ((part5 & UINT64_C(0x00000000FF000000)) << 8) + |
| 326 | ((part5 & UINT64_C(0x0000000000FF0000)) << 24) + |
| 327 | ((part5 & UINT64_C(0x000000000000FF00)) << 40) + |
| 328 | ((part5 & UINT64_C(0x00000000000000FF)) << 56); |
| 329 | entered = 1; |
| 330 | } // if/else |
| 331 | printf("New GUID: %s\n", GUIDToStr(theGUID, temp)); |
| 332 | return theGUID; |
| 333 | } // GetGUID() |
| 334 | |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 335 | // Return 1 if the CPU architecture is little endian, 0 if it's big endian.... |
| 336 | int IsLittleEndian(void) { |
| 337 | int littleE = 1; // assume little-endian (Intel-style) |
| 338 | union { |
| 339 | uint32_t num; |
| 340 | unsigned char uc[sizeof(uint32_t)]; |
| 341 | } endian; |
| 342 | |
| 343 | endian.num = 1; |
| 344 | if (endian.uc[0] != (unsigned char) 1) { |
| 345 | littleE = 0; |
| 346 | } // if |
| 347 | return (littleE); |
| 348 | } // IsLittleEndian() |
| 349 | |
| 350 | // Reverse the byte order of theValue; numBytes is number of bytes |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 351 | void ReverseBytes(void* theValue, int numBytes) { |
| 352 | char* origValue; |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 353 | char* tempValue; |
| 354 | int i; |
| 355 | |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 356 | origValue = (char*) theValue; |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 357 | tempValue = (char*) malloc(numBytes); |
| 358 | for (i = 0; i < numBytes; i++) |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 359 | tempValue[i] = origValue[i]; |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 360 | for (i = 0; i < numBytes; i++) |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 361 | origValue[i] = tempValue[numBytes - i - 1]; |
srs5694 | 2a9f5da | 2009-08-26 00:48:01 -0400 | [diff] [blame] | 362 | free(tempValue); |
| 363 | } // ReverseBytes() |
| 364 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 365 | // Compute (2 ^ value). Given the return type, value must be 63 or less. |
| 366 | // Used in some bit-fiddling functions |
| 367 | uint64_t PowerOf2(int value) { |
| 368 | uint64_t retval = 1; |
| 369 | int i; |
| 370 | |
| 371 | if ((value < 64) && (value >= 0)) { |
| 372 | for (i = 0; i < value; i++) { |
| 373 | retval *= 2; |
| 374 | } // for |
| 375 | } else retval = 0; |
| 376 | return retval; |
| 377 | } // PowerOf2() |
| 378 | |
srs5694 | e4ac11e | 2009-08-31 10:13:04 -0400 | [diff] [blame] | 379 | // An extended file-open function. This includes some system-specific checks. |
| 380 | // I want them in a function because I use these calls twice and I don't want |
| 381 | // to forget to change them in one location if I need to change them in |
| 382 | // the other.... |
| 383 | int OpenForWrite(char* deviceFilename) { |
| 384 | int fd; |
| 385 | |
| 386 | fd = open(deviceFilename, O_WRONLY); // try to open the device; may fail.... |
| 387 | #ifdef __APPLE__ |
| 388 | // MacOS X requires a shared lock under some circumstances.... |
| 389 | if (fd < 0) { |
| 390 | fd = open(deviceFilename, O_WRONLY|O_SHLOCK); |
| 391 | } // if |
| 392 | #endif |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 393 | return fd; |
| 394 | } // OpenForWrite() |
| 395 | |
| 396 | // Resync disk caches so the OS uses the new partition table. This code varies |
| 397 | // a lot from one OS to another. |
| 398 | void DiskSync(int fd) { |
| 399 | int i; |
| 400 | |
| 401 | sync(); |
| 402 | #ifdef __APPLE__ |
| 403 | printf("Warning: The kernel may continue to use old or deleted partitions.\n" |
| 404 | "You should reboot or remove the drive.\n"); |
| 405 | /* don't know if this helps |
| 406 | * it definitely will get things on disk though: |
| 407 | * http://topiks.org/mac-os-x/0321278542/ch12lev1sec8.html */ |
| 408 | i = ioctl(fd, DKIOCSYNCHRONIZECACHE); |
| 409 | #else |
| 410 | #ifdef __FreeBSD__ |
| 411 | sleep(2); |
| 412 | i = ioctl(fd, DIOCGFLUSH); |
| 413 | printf("Warning: The kernel may continue to use old or deleted partitions.\n" |
| 414 | "You should reboot or remove the drive.\n"); |
| 415 | #else |
| 416 | sleep(2); |
| 417 | i = ioctl(fd, BLKRRPART); |
| 418 | if (i) |
| 419 | printf("Warning: The kernel is still using the old partition table.\n" |
| 420 | "The new table will be used at the next reboot.\n"); |
| 421 | #endif |
| 422 | #endif |
| 423 | } // DiskSync() |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 424 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 425 | /************************************************************************************** |
| 426 | * * |
| 427 | * Below functions are lifted from various sources, as documented in comments before * |
| 428 | * each one. * |
| 429 | * * |
| 430 | **************************************************************************************/ |
| 431 | |
| 432 | // The disksize function is taken from the Linux fdisk code and modified |
| 433 | // to work around a problem returning a uint64_t value on Mac OS. |
| 434 | uint64_t disksize(int fd, int *err) { |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 435 | long sz; // Do not delete; needed for Linux |
| 436 | long long b; // Do not delete; needed for Linux |
| 437 | uint64_t sectors = 0, bytes = 0; // size in sectors & bytes |
| 438 | struct stat st; |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 439 | |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 440 | // Note to self: I recall testing a simplified version of |
| 441 | // this code, similar to what's in the __APPLE__ block, |
| 442 | // on Linux, but I had some problems. IIRC, it ran OK on 32-bit |
| 443 | // systems but not on 64-bit. Keep this in mind in case of |
| 444 | // 32/64-bit issues on MacOS.... |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 445 | #ifdef __APPLE__ |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 446 | *err = ioctl(fd, DKIOCGETBLOCKCOUNT, §ors); |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 447 | #else |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 448 | #ifdef __FreeBSD__ |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 449 | *err = ioctl(fd, DIOCGMEDIASIZE, &sz); |
| 450 | b = GetBlockSize(fd); |
| 451 | sectors = sz / b; |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 452 | #else |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 453 | *err = ioctl(fd, BLKGETSIZE, &sz); |
| 454 | if (*err) { |
| 455 | sectors = sz = 0; |
| 456 | } // if |
| 457 | if ((errno == EFBIG) || (!*err)) { |
| 458 | *err = ioctl(fd, BLKGETSIZE64, &b); |
| 459 | if (*err || b == 0 || b == sz) |
| 460 | sectors = sz; |
| 461 | else |
| 462 | sectors = (b >> 9); |
| 463 | } // if |
| 464 | |
| 465 | // if (*err) { |
| 466 | // sz = 0; |
| 467 | // if (errno != EFBIG) |
| 468 | // return sz; |
| 469 | // } |
| 470 | // *err = ioctl(fd, BLKGETSIZE64, &b); |
| 471 | // if (*err || b == 0 || b == sz) |
| 472 | // sectors = sz; |
| 473 | // else |
| 474 | // sectors = (b >> 9); |
| 475 | |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 476 | #endif |
srs5694 | 221e087 | 2009-08-29 15:00:31 -0400 | [diff] [blame] | 477 | #endif |
srs5694 | e35eb1b | 2009-09-14 00:29:34 -0400 | [diff] [blame^] | 478 | |
| 479 | // The above methods have failed (or it's a bum filename reference), |
| 480 | // so let's assume it's a regular file (a QEMU image, dd backup, or |
| 481 | // what have you) and see what stat() gives us.... |
| 482 | if (sectors == 0) { |
| 483 | if (fstat(fd, &st) == 0) { |
| 484 | bytes = (uint64_t) st.st_size; |
| 485 | if ((bytes % UINT64_C(512)) != 0) |
| 486 | fprintf(stderr, "Warning: File size is not a multiple of 512 bytes!" |
| 487 | " Misbehavior is likely!\n\a"); |
| 488 | sectors = bytes / UINT64_C(512); |
| 489 | } // if |
| 490 | } // if |
| 491 | // printf("In disksize(), sectors is %lld.\n", sectors); |
| 492 | return sectors; |
srs5694 | e7b4ff9 | 2009-08-18 13:16:10 -0400 | [diff] [blame] | 493 | } |