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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 11.24 2002/07/12 18:56:52 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 defined(HAVE_PREAD) && defined(HAVE_PWRITE)
switch (op) {
case DB_IO_READ:
if (DB_GLOBAL(j_read) != NULL)
goto slow;
*niop = pread(db_iop->fhp->fd, db_iop->buf,
db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize);
break;
case DB_IO_WRITE:
if (DB_GLOBAL(j_write) != NULL)
goto slow;
*niop = pwrite(db_iop->fhp->fd, db_iop->buf,
db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize);
break;
}
if (*niop == (size_t)db_iop->bytes)
return (0);
slow:
#endif
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;
ssize_t nr;
int ret;
u_int8_t *taddr;
for (taddr = addr,
offset = 0; offset < len; taddr += nr, offset += nr) {
retry: if ((nr = DB_GLOBAL(j_read) != NULL ?
DB_GLOBAL(j_read)(fhp->fd, taddr, len - offset) :
read(fhp->fd, taddr, len - offset)) < 0) {
if ((ret = __os_get_errno()) == EINTR)
goto retry;
__db_err(dbenv, "read: 0x%x, %lu: %s", 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;
ssize_t nw;
int ret;
u_int8_t *taddr;
for (taddr = addr,
offset = 0; offset < len; taddr += nw, offset += nw)
retry: if ((nw = DB_GLOBAL(j_write) != NULL ?
DB_GLOBAL(j_write)(fhp->fd, taddr, len - offset) :
write(fhp->fd, taddr, len - offset)) < 0) {
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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