os_stat.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1997-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: os_stat.c,v 11.20 2002/07/12 18:56:53 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- /*
- * __os_exists --
- * Return if the file exists.
- *
- * PUBLIC: int __os_exists __P((const char *, int *));
- */
- int
- __os_exists(path, isdirp)
- const char *path;
- int *isdirp;
- {
- int ret;
- struct stat sb;
- if (DB_GLOBAL(j_exists) != NULL)
- return (DB_GLOBAL(j_exists)(path, isdirp));
- do {
- ret =
- #ifdef HAVE_VXWORKS
- stat((char *)path, &sb);
- #else
- stat(path, &sb);
- #endif
- if (ret != 0)
- ret = __os_get_errno();
- } while (ret == EINTR);
- if (ret != 0)
- return (ret);
- #if !defined(S_ISDIR) || defined(STAT_MACROS_BROKEN)
- #undef S_ISDIR
- #ifdef _S_IFDIR
- #define S_ISDIR(m) (_S_IFDIR & (m))
- #else
- #define S_ISDIR(m) (((m) & 0170000) == 0040000)
- #endif
- #endif
- if (isdirp != NULL)
- *isdirp = S_ISDIR(sb.st_mode);
- return (0);
- }
- /*
- * __os_ioinfo --
- * Return file size and I/O size; abstracted to make it easier
- * to replace.
- *
- * PUBLIC: int __os_ioinfo __P((DB_ENV *, const char *,
- * PUBLIC: DB_FH *, u_int32_t *, u_int32_t *, u_int32_t *));
- */
- int
- __os_ioinfo(dbenv, path, fhp, mbytesp, bytesp, iosizep)
- DB_ENV *dbenv;
- const char *path;
- DB_FH *fhp;
- u_int32_t *mbytesp, *bytesp, *iosizep;
- {
- int ret;
- struct stat sb;
- if (DB_GLOBAL(j_ioinfo) != NULL)
- return (DB_GLOBAL(j_ioinfo)(path,
- fhp->fd, mbytesp, bytesp, iosizep));
- retry:
- if (fstat(fhp->fd, &sb) == -1) {
- if ((ret = __os_get_errno()) == EINTR)
- goto retry;
- __db_err(dbenv, "fstat: %s", strerror(ret));
- return (ret);
- }
- /* Return the size of the file. */
- if (mbytesp != NULL)
- *mbytesp = (u_int32_t)(sb.st_size / MEGABYTE);
- if (bytesp != NULL)
- *bytesp = (u_int32_t)(sb.st_size % MEGABYTE);
- /*
- * Return the underlying filesystem blocksize, if available.
- *
- * XXX
- * Check for a 0 size -- the HP MPE/iX architecture has st_blksize,
- * but it's always 0.
- */
- #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
- if (iosizep != NULL && (*iosizep = sb.st_blksize) == 0)
- *iosizep = DB_DEF_IOSIZE;
- #else
- if (iosizep != NULL)
- *iosizep = DB_DEF_IOSIZE;
- #endif
- return (0);
- }