os_fsync.c
上传用户:romrleung
上传日期:2022-05-23
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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_fsync.c,v 11.14 2002/07/12 18:56:50 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <fcntl.h> /* XXX: Required by __hp3000s900 */
- #include <unistd.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #ifdef HAVE_VXWORKS
- #include "ioLib.h"
- #define fsync(fd) __vx_fsync(fd);
- int
- __vx_fsync(fd)
- int fd;
- {
- int ret;
- /*
- * The results of ioctl are driver dependent. Some will return the
- * number of bytes sync'ed. Only if it returns 'ERROR' should we
- * flag it.
- */
- if ((ret = ioctl(fd, FIOSYNC, 0)) != ERROR)
- return (0);
- return (ret);
- }
- #endif
- #ifdef __hp3000s900
- #define fsync(fd) __mpe_fsync(fd);
- int
- __mpe_fsync(fd)
- int fd;
- {
- extern FCONTROL(short, short, void *);
- FCONTROL(_MPE_FILENO(fd), 2, NULL); /* Flush the buffers */
- FCONTROL(_MPE_FILENO(fd), 6, NULL); /* Write the EOF */
- return (0);
- }
- #endif
- /*
- * __os_fsync --
- * Flush a file descriptor.
- *
- * PUBLIC: int __os_fsync __P((DB_ENV *, DB_FH *));
- */
- int
- __os_fsync(dbenv, fhp)
- DB_ENV *dbenv;
- DB_FH *fhp;
- {
- int ret;
- /*
- * Do nothing if the file descriptor has been marked as not requiring
- * any sync to disk.
- */
- if (F_ISSET(fhp, DB_FH_NOSYNC))
- return (0);
- do {
- ret = DB_GLOBAL(j_fsync) != NULL ?
- DB_GLOBAL(j_fsync)(fhp->fd) : fsync(fhp->fd);
- } while (ret != 0 && (ret = __os_get_errno()) == EINTR);
- if (ret != 0)
- __db_err(dbenv, "fsync %s", strerror(ret));
- return (ret);
- }