1 *7c478bd9Sstevel@tonic-gate /*- 2 *7c478bd9Sstevel@tonic-gate * See the file LICENSE for redistribution information. 3 *7c478bd9Sstevel@tonic-gate * 4 *7c478bd9Sstevel@tonic-gate * Copyright (c) 1996, 1997, 1998 5 *7c478bd9Sstevel@tonic-gate * Sleepycat Software. All rights reserved. 6 *7c478bd9Sstevel@tonic-gate */ 7 *7c478bd9Sstevel@tonic-gate 8 *7c478bd9Sstevel@tonic-gate #include "config.h" 9 *7c478bd9Sstevel@tonic-gate 10 *7c478bd9Sstevel@tonic-gate #ifndef lint 11 *7c478bd9Sstevel@tonic-gate static const char sccsid[] = "@(#)os_fid.c 10.12 (Sleepycat) 7/21/98"; 12 *7c478bd9Sstevel@tonic-gate #endif /* not lint */ 13 *7c478bd9Sstevel@tonic-gate 14 *7c478bd9Sstevel@tonic-gate #ifndef NO_SYSTEM_INCLUDES 15 *7c478bd9Sstevel@tonic-gate #include <sys/types.h> 16 *7c478bd9Sstevel@tonic-gate #include <sys/stat.h> 17 *7c478bd9Sstevel@tonic-gate 18 *7c478bd9Sstevel@tonic-gate #include <errno.h> 19 *7c478bd9Sstevel@tonic-gate #include <string.h> 20 *7c478bd9Sstevel@tonic-gate #include <time.h> 21 *7c478bd9Sstevel@tonic-gate #endif 22 *7c478bd9Sstevel@tonic-gate 23 *7c478bd9Sstevel@tonic-gate #include "db_int.h" 24 *7c478bd9Sstevel@tonic-gate #include "common_ext.h" 25 *7c478bd9Sstevel@tonic-gate 26 *7c478bd9Sstevel@tonic-gate /* 27 *7c478bd9Sstevel@tonic-gate * __os_fileid -- 28 *7c478bd9Sstevel@tonic-gate * Return a unique identifier for a file. 29 *7c478bd9Sstevel@tonic-gate * 30 *7c478bd9Sstevel@tonic-gate * PUBLIC: int __os_fileid __P((DB_ENV *, const char *, int, u_int8_t *)); 31 *7c478bd9Sstevel@tonic-gate */ 32 *7c478bd9Sstevel@tonic-gate int 33 *7c478bd9Sstevel@tonic-gate __os_fileid(dbenv, fname, timestamp, fidp) 34 *7c478bd9Sstevel@tonic-gate DB_ENV *dbenv; 35 *7c478bd9Sstevel@tonic-gate const char *fname; 36 *7c478bd9Sstevel@tonic-gate int timestamp; 37 *7c478bd9Sstevel@tonic-gate u_int8_t *fidp; 38 *7c478bd9Sstevel@tonic-gate { 39 *7c478bd9Sstevel@tonic-gate struct stat sb; 40 *7c478bd9Sstevel@tonic-gate size_t i; 41 *7c478bd9Sstevel@tonic-gate time_t now; 42 *7c478bd9Sstevel@tonic-gate u_int8_t *p; 43 *7c478bd9Sstevel@tonic-gate 44 *7c478bd9Sstevel@tonic-gate /* Clear the buffer. */ 45 *7c478bd9Sstevel@tonic-gate memset(fidp, 0, DB_FILE_ID_LEN); 46 *7c478bd9Sstevel@tonic-gate 47 *7c478bd9Sstevel@tonic-gate /* Check for the unthinkable. */ 48 *7c478bd9Sstevel@tonic-gate if (sizeof(sb.st_ino) + 49 *7c478bd9Sstevel@tonic-gate sizeof(sb.st_dev) + sizeof(time_t) > DB_FILE_ID_LEN) 50 *7c478bd9Sstevel@tonic-gate return (EINVAL); 51 *7c478bd9Sstevel@tonic-gate 52 *7c478bd9Sstevel@tonic-gate /* On UNIX, use a dev/inode pair. */ 53 *7c478bd9Sstevel@tonic-gate if (stat(fname, &sb)) { 54 *7c478bd9Sstevel@tonic-gate __db_err(dbenv, "%s: %s", fname, strerror(errno)); 55 *7c478bd9Sstevel@tonic-gate return (errno); 56 *7c478bd9Sstevel@tonic-gate } 57 *7c478bd9Sstevel@tonic-gate 58 *7c478bd9Sstevel@tonic-gate /* 59 *7c478bd9Sstevel@tonic-gate * Use the inode first and in reverse order, hopefully putting the 60 *7c478bd9Sstevel@tonic-gate * distinguishing information early in the string. 61 *7c478bd9Sstevel@tonic-gate */ 62 *7c478bd9Sstevel@tonic-gate for (p = (u_int8_t *)&sb.st_ino + 63 *7c478bd9Sstevel@tonic-gate sizeof(sb.st_ino), i = 0; i < sizeof(sb.st_ino); ++i) 64 *7c478bd9Sstevel@tonic-gate *fidp++ = *--p; 65 *7c478bd9Sstevel@tonic-gate for (p = (u_int8_t *)&sb.st_dev + 66 *7c478bd9Sstevel@tonic-gate sizeof(sb.st_dev), i = 0; i < sizeof(sb.st_dev); ++i) 67 *7c478bd9Sstevel@tonic-gate *fidp++ = *--p; 68 *7c478bd9Sstevel@tonic-gate 69 *7c478bd9Sstevel@tonic-gate if (timestamp) { 70 *7c478bd9Sstevel@tonic-gate (void)time(&now); 71 *7c478bd9Sstevel@tonic-gate for (p = (u_int8_t *)&now + 72 *7c478bd9Sstevel@tonic-gate sizeof(now), i = 0; i < sizeof(now); ++i) 73 *7c478bd9Sstevel@tonic-gate *fidp++ = *--p; 74 *7c478bd9Sstevel@tonic-gate } 75 *7c478bd9Sstevel@tonic-gate return (0); 76 *7c478bd9Sstevel@tonic-gate } 77