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https://github.com/MariaDB/server.git
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147 lines
3 KiB
C
147 lines
3 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 1998, 1999, 2000
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char revid[] = "$Id: os_rw.c,v 11.15 2000/11/15 19:25:39 sue Exp $";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <string.h>
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#include <unistd.h>
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#endif
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#include "db_int.h"
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#include "os_jump.h"
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/*
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* __os_io --
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* Do an I/O.
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*
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* PUBLIC: int __os_io __P((DB_ENV *, DB_IO *, int, size_t *));
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*/
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int
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__os_io(dbenv, db_iop, op, niop)
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DB_ENV *dbenv;
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DB_IO *db_iop;
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int op;
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size_t *niop;
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{
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int ret;
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#if defined(HAVE_PREAD) && defined(HAVE_PWRITE)
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switch (op) {
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case DB_IO_READ:
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if (__db_jump.j_read != NULL)
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goto slow;
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*niop = pread(db_iop->fhp->fd, db_iop->buf,
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db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize);
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break;
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case DB_IO_WRITE:
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if (__db_jump.j_write != NULL)
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goto slow;
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*niop = pwrite(db_iop->fhp->fd, db_iop->buf,
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db_iop->bytes, (off_t)db_iop->pgno * db_iop->pagesize);
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break;
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}
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if (*niop == (size_t)db_iop->bytes)
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return (0);
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slow:
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#endif
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MUTEX_THREAD_LOCK(dbenv, db_iop->mutexp);
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if ((ret = __os_seek(dbenv, db_iop->fhp,
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db_iop->pagesize, db_iop->pgno, 0, 0, DB_OS_SEEK_SET)) != 0)
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goto err;
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switch (op) {
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case DB_IO_READ:
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ret = __os_read(dbenv,
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db_iop->fhp, db_iop->buf, db_iop->bytes, niop);
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break;
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case DB_IO_WRITE:
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ret = __os_write(dbenv,
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db_iop->fhp, db_iop->buf, db_iop->bytes, niop);
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break;
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}
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err: MUTEX_THREAD_UNLOCK(dbenv, db_iop->mutexp);
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return (ret);
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}
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/*
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* __os_read --
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* Read from a file handle.
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*
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* PUBLIC: int __os_read __P((DB_ENV *, DB_FH *, void *, size_t, size_t *));
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*/
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int
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__os_read(dbenv, fhp, addr, len, nrp)
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DB_ENV *dbenv;
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DB_FH *fhp;
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void *addr;
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size_t len;
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size_t *nrp;
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{
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size_t offset;
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ssize_t nr;
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int ret;
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u_int8_t *taddr;
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for (taddr = addr,
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offset = 0; offset < len; taddr += nr, offset += nr) {
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if ((nr = __db_jump.j_read != NULL ?
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__db_jump.j_read(fhp->fd, taddr, len - offset) :
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read(fhp->fd, taddr, len - offset)) < 0) {
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ret = __os_get_errno();
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__db_err(dbenv, "read: 0x%x, %lu: %s", taddr,
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(u_long)len-offset, strerror(ret));
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return (ret);
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}
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if (nr == 0)
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break;
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}
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*nrp = taddr - (u_int8_t *)addr;
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return (0);
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}
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/*
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* __os_write --
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* Write to a file handle.
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*
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* PUBLIC: int __os_write __P((DB_ENV *, DB_FH *, void *, size_t, size_t *));
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*/
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int
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__os_write(dbenv, fhp, addr, len, nwp)
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DB_ENV *dbenv;
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DB_FH *fhp;
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void *addr;
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size_t len;
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size_t *nwp;
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{
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size_t offset;
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ssize_t nw;
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int ret;
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u_int8_t *taddr;
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for (taddr = addr,
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offset = 0; offset < len; taddr += nw, offset += nw)
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if ((nw = __db_jump.j_write != NULL ?
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__db_jump.j_write(fhp->fd, taddr, len - offset) :
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write(fhp->fd, taddr, len - offset)) < 0) {
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ret = __os_get_errno();
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__db_err(dbenv, "write: 0x%x, %lu: %s", taddr,
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(u_long)len-offset, strerror(ret));
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return (ret);
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}
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*nwp = len;
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return (0);
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}
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