1 files changed, 147 insertions, 0 deletions
diff --git a/db/os/os_rw.c b/db/os/os_rw.c
new file mode 100644
index 000000000..7e8e1255d
--- /dev/null
+++ b/db/os/os_rw.c
@@ -0,0 +1,147 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997, 1998, 1999, 2000
+ *	Sleepycat Software.  All rights reserved.
+ */
+
+#include "db_config.h"
+
+#ifndef lint
+static const char revid[] = "$Id: os_rw.c,v 11.15 2000/11/15 19:25:39 sue Exp $";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <string.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_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_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 (__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 == (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) {
+		if ((nr = __db_jump.j_read != NULL ?
+		    __db_jump.j_read(fhp->fd, taddr, len - offset) :
+		    read(fhp->fd, taddr, len - offset)) < 0) {
+			ret = __os_get_errno();
+			__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)
+		if ((nw = __db_jump.j_write != NULL ?
+		    __db_jump.j_write(fhp->fd, taddr, len - offset) :
+		    write(fhp->fd, taddr, len - offset)) < 0) {
+			ret = __os_get_errno();
+			__db_err(dbenv, "write: 0x%x, %lu: %s", taddr,
+			    (u_long)len-offset, strerror(ret));
+			return (ret);
+		}
+	*nwp = len;
+	return (0);
+}