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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997, 1998
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)os_rw.c 10.11 (Sleepycat) 10/12/98";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "os_jump.h"
/*
* __os_io --
* Do an I/O.
*
* PUBLIC: int __os_io __P((DB_IO *, int, ssize_t *));
*/
int
__os_io(db_iop, op, niop)
DB_IO *db_iop;
int op;
ssize_t *niop;
{
int ret;
#ifdef HAVE_PREAD
switch (op) {
case DB_IO_READ:
if (__db_jump.j_read != NULL)
goto slow;
*niop = pread(db_iop->fd_io, db_iop->buf,
db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize);
break;
case DB_IO_WRITE:
if (__db_jump.j_write != NULL)
goto slow;
*niop = pwrite(db_iop->fd_io, db_iop->buf,
db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize);
break;
}
if (*niop == db_iop->bytes)
return (0);
slow:
#endif
if (db_iop->mutexp != NULL)
(void)__db_mutex_lock(db_iop->mutexp, db_iop->fd_lock);
if ((ret = __os_seek(db_iop->fd_io,
db_iop->pagesize, db_iop->pgno, 0, 0, SEEK_SET)) != 0)
goto err;
switch (op) {
case DB_IO_READ:
ret =
__os_read(db_iop->fd_io, db_iop->buf, db_iop->bytes, niop);
break;
case DB_IO_WRITE:
ret =
__os_write(db_iop->fd_io, db_iop->buf, db_iop->bytes, niop);
break;
}
err: if (db_iop->mutexp != NULL)
(void)__db_mutex_unlock(db_iop->mutexp, db_iop->fd_lock);
return (ret);
}
/*
* __os_read --
* Read from a file handle.
*
* PUBLIC: int __os_read __P((int, void *, size_t, ssize_t *));
*/
int
__os_read(fd, addr, len, nrp)
int fd;
void *addr;
size_t len;
ssize_t *nrp;
{
size_t offset;
ssize_t nr;
u_int8_t *taddr;
for (taddr = addr,
offset = 0; offset < len; taddr += nr, offset += nr) {
if ((nr = __db_jump.j_read != NULL ?
__db_jump.j_read(fd, taddr, len - offset) :
read(fd, taddr, len - offset)) < 0)
return (errno);
if (nr == 0)
break;
}
*nrp = taddr - (u_int8_t *)addr;
return (0);
}
/*
* __os_write --
* Write to a file handle.
*
* PUBLIC: int __os_write __P((int, void *, size_t, ssize_t *));
*/
int
__os_write(fd, addr, len, nwp)
int fd;
const void *addr;
size_t len;
ssize_t *nwp;
{
size_t offset;
ssize_t nw;
const u_int8_t *taddr;
for (taddr = addr,
offset = 0; offset < len; taddr += nw, offset += nw)
if ((nw = __db_jump.j_write != NULL ?
__db_jump.j_write(fd, taddr, len - offset) :
write(fd, taddr, len - offset)) < 0)
return (errno);
*nwp = len;
return (0);
}
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