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