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/*-
* 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_rw.c,v 11.28 2002/08/06 04:56:19 bostic Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
/*
* __os_io --
* Do an I/O.
*
* PUBLIC: int __os_io __P((DB_ENV *, DB_IO *, int, size_t *));
*/
int
__os_io(dbenv, db_iop, op, niop)
DB_ENV *dbenv;
DB_IO *db_iop;
int op;
size_t *niop;
{
int ret;
if (__os_is_winnt()) {
ULONG64 off = (ULONG64)db_iop->pagesize * db_iop->pgno;
OVERLAPPED over;
DWORD nbytes;
over.Offset = (DWORD)(off & 0xffffffff);
over.OffsetHigh = (DWORD)(off >> 32);
over.hEvent = 0; /* we don't want asynchronous notifications */
switch (op) {
case DB_IO_READ:
if (DB_GLOBAL(j_read) != NULL)
goto slow;
if (!ReadFile(db_iop->fhp->handle,
db_iop->buf, (DWORD)db_iop->bytes, &nbytes, &over))
goto slow;
break;
case DB_IO_WRITE:
if (DB_GLOBAL(j_write) != NULL)
goto slow;
if (!WriteFile(db_iop->fhp->handle,
db_iop->buf, (DWORD)db_iop->bytes, &nbytes, &over))
goto slow;
break;
}
if (nbytes == db_iop->bytes) {
*niop = (size_t)nbytes;
return (0);
}
}
slow: MUTEX_THREAD_LOCK(dbenv, db_iop->mutexp);
if ((ret = __os_seek(dbenv, db_iop->fhp,
db_iop->pagesize, db_iop->pgno, 0, 0, DB_OS_SEEK_SET)) != 0)
goto err;
switch (op) {
case DB_IO_READ:
ret = __os_read(dbenv,
db_iop->fhp, db_iop->buf, db_iop->bytes, niop);
break;
case DB_IO_WRITE:
ret = __os_write(dbenv,
db_iop->fhp, db_iop->buf, db_iop->bytes, niop);
break;
}
err: MUTEX_THREAD_UNLOCK(dbenv, db_iop->mutexp);
return (ret);
}
/*
* __os_read --
* Read from a file handle.
*
* PUBLIC: int __os_read __P((DB_ENV *, DB_FH *, void *, size_t, size_t *));
*/
int
__os_read(dbenv, fhp, addr, len, nrp)
DB_ENV *dbenv;
DB_FH *fhp;
void *addr;
size_t len;
size_t *nrp;
{
size_t offset;
DWORD nr;
int ret;
BOOL success;
u_int8_t *taddr;
for (taddr = addr,
offset = 0; offset < len; taddr += nr, offset += nr) {
retry: if (DB_GLOBAL(j_read) != NULL) {
nr = (DWORD)DB_GLOBAL(j_read)(fhp->fd,
taddr, len - offset);
success = (nr >= 0);
} else {
success = ReadFile(fhp->handle,
taddr, (DWORD)(len - offset), &nr, NULL);
if (!success)
__os_set_errno(__os_win32_errno());
}
if (!success) {
if ((ret = __os_get_errno()) == EINTR)
goto retry;
__db_err(dbenv, "read: 0x%lx, %lu: %s",
P_TO_ULONG(taddr),
(u_long)len - offset, strerror(ret));
return (ret);
}
if (nr == 0)
break;
}
*nrp = taddr - (u_int8_t *)addr;
return (0);
}
/*
* __os_write --
* Write to a file handle.
*
* PUBLIC: int __os_write __P((DB_ENV *, DB_FH *, void *, size_t, size_t *));
*/
int
__os_write(dbenv, fhp, addr, len, nwp)
DB_ENV *dbenv;
DB_FH *fhp;
void *addr;
size_t len;
size_t *nwp;
{
size_t offset;
DWORD nw;
int ret;
BOOL success;
u_int8_t *taddr;
for (taddr = addr,
offset = 0; offset < len; taddr += nw, offset += nw) {
retry: if (DB_GLOBAL(j_write) != NULL) {
nw = (DWORD)DB_GLOBAL(j_write)(fhp->fd,
taddr, len - offset);
success = (nw >= 0);
} else {
success = WriteFile(fhp->handle,
taddr, (DWORD)(len - offset), &nw, NULL);
if (!success)
__os_set_errno(__os_win32_errno());
}
if (!success) {
if ((ret = __os_get_errno()) == EINTR)
goto retry;
__db_err(dbenv, "write: 0x%x, %lu: %s", taddr,
(u_long)len-offset, strerror(ret));
return (ret);
}
}
*nwp = len;
return (0);
}
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