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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997, 1998, 1999
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char sccsid[] = "@(#)os_rw.c 11.2 (Sleepycat) 9/20/99";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#ifndef _MSC_VER /* _WIN32 */
#include <unistd.h>
#endif
#endif
#include "db_int.h"
#include "os_jump.h"
/*
* CDB___os_io --
* Do an I/O.
*
* PUBLIC: int CDB___os_io __P((DB_IO *, int, ssize_t *));
*/
int
CDB___os_io(db_iop, op, niop)
DB_IO *db_iop;
int op;
ssize_t *niop;
{
int ret;
/* HACK to debug where the O_BINARY mode of the file gets fouled up */
/*
printf("\n[CDB___os_io]");
printf("DB_IO_READ:[%d], DB_IO_WRITE:[%d]\n", (DB_IO_READ==op?1:0), (DB_IO_WRITE==op?1:0));
printf("[CDB___os_io]");
#ifdef HAVE_PREAD
printf("using pread/pwrite\n");
#else
printf("using CDB___os_read & CDB___os_write\n");
#endif
printf("[CDB___os_io]");
printf("FD=[%d], BYTES=[%d], PAGESIZE=[%d]\n", db_iop->fhp->fd, db_iop->bytes,db_iop->pagesize);
*/
#ifdef HAVE_PREAD
switch (op) {
case DB_IO_READ:
if (CDB___db_jump.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 (CDB___db_jump.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 == (ssize_t)db_iop->bytes)
return (0);
slow:
#endif
MUTEX_THREAD_LOCK(db_iop->mutexp);
if ((ret = CDB___os_seek(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 =
CDB___os_read(db_iop->fhp, db_iop->buf, db_iop->bytes, niop);
break;
case DB_IO_WRITE:
ret =
CDB___os_write(db_iop->fhp, db_iop->buf, db_iop->bytes, niop);
break;
}
err: MUTEX_THREAD_UNLOCK(db_iop->mutexp);
return (ret);
}
/*
* CDB___os_read --
* Read from a file handle.
*
* PUBLIC: int CDB___os_read __P((DB_FH *, void *, size_t, ssize_t *));
*/
int
CDB___os_read(fhp, addr, len, nrp)
DB_FH *fhp;
void *addr;
size_t len;
ssize_t *nrp;
{
size_t offset;
ssize_t nr;
u_int8_t *taddr;
/* HACK to debug where the O_BINARY mode of the file gets fouled up */
/*
printf("\n[CDB___os_read] fhp->fd=[%d], len=[%d]\n", fhp->fd, len);
printf("[CDB___os_read] CDB___db_jump.j_read==NULL ?[%d]\n",
( CDB___db_jump.j_read == NULL ?1:0) );
printf("[CDB___os_read] lseek(fhp->fd, 0, SEEK_CUR)=[%d]\n", lseek(fhp->fd, 0, SEEK_CUR));
printf("[CDB___os_read] current mode=[%#x]\n", setmode(fhp->fd, 0x8000));
*/
for (taddr = addr,
offset = 0; offset < len; taddr += nr, offset += nr) {
if ((nr = CDB___db_jump.j_read != NULL ?
CDB___db_jump.j_read(fhp->fd, taddr, len - offset) :
read(fhp->fd, taddr, len - offset)) < 0)
return (CDB___os_get_errno());
if (nr == 0)
break;
}
*nrp = taddr - (u_int8_t *)addr;
return (0);
}
/*
* CDB___os_write --
* Write to a file handle.
*
* PUBLIC: int CDB___os_write __P((DB_FH *, void *, size_t, ssize_t *));
*/
int
CDB___os_write(fhp, addr, len, nwp)
DB_FH *fhp;
void *addr;
size_t len;
ssize_t *nwp;
{
size_t offset;
ssize_t nw;
u_int8_t *taddr;
/* HACK to debug where the O_BINARY mode of the file gets fouled up */
/*
printf("\n[CDB___os_write] fhp->fd=[%d], len=[%d]\n", fhp->fd, len);
printf("[CDB___os_write] CDB___db_jump.j_write==NULL ?[%d]\n",
( CDB___db_jump.j_write == NULL ?1:0) );
printf("[CDB___os_write] lseek(fhp->fd, 0, SEEK_CUR)=[%d]\n", lseek(fhp->fd, 0, SEEK_CUR));
printf("[CDB___os_write] current mode=[%#x]\n", setmode(fhp->fd, 0x8000));
*/
for (taddr = addr,
offset = 0; offset < len; taddr += nw, offset += nw)
{
if ((nw = CDB___db_jump.j_write != NULL ?
CDB___db_jump.j_write(fhp->fd, taddr, len - offset) :
write(fhp->fd, taddr, len - offset)) < 0)
return (CDB___os_get_errno());
/* HACK to debug where the O_BINARY mode of the file gets fouled up */
/* printf("** %d bytes written, wanted to write %d\n", nw, len-offset); */
}
*nwp = len;
/* HACK to debug where the O_BINARY mode of the file gets fouled up */
/* printf("[AFTER CDB___os_write] lseek(fhp->fd, 0, SEEK_CUR)=[%d]\n", lseek(fhp->fd, 0, SEEK_CUR)); */
return (0);
}
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