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