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14a1bb6a08
1999-06-14 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * sysdeps/unix/sysv/linux/sys/sysmacros.h [!__GNUC__]: Use correct word order. * sysdeps/unix/sysv/linux/alpha/sys/sysmacros.h: New file. * sysdeps/unix/sysv/linux/sparc/sys/sysmacros.h: New file. 1999-06-15 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * db2/db/db.c: Restore __nss_db_open alias. * db2/db_int.h: Use <db.h> instead of "db.h" to find header in include. * db2/os/os_rw.c (__os_write): Maintain const correctness. * db2/progs/db_load/db_load.c (main): Avoid ambiguous `else'.
137 lines
2.6 KiB
C
137 lines
2.6 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
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_rw.c 10.11 (Sleepycat) 10/12/98";
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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 <errno.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_IO *, int, ssize_t *));
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*/
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int
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__os_io(db_iop, op, niop)
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DB_IO *db_iop;
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int op;
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ssize_t *niop;
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{
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int ret;
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#ifdef HAVE_PREAD
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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->fd_io, 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->fd_io, 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 == db_iop->bytes)
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return (0);
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slow:
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#endif
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if (db_iop->mutexp != NULL)
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(void)__db_mutex_lock(db_iop->mutexp, db_iop->fd_lock);
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if ((ret = __os_seek(db_iop->fd_io,
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db_iop->pagesize, db_iop->pgno, 0, 0, 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 =
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__os_read(db_iop->fd_io, 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 =
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__os_write(db_iop->fd_io, db_iop->buf, db_iop->bytes, niop);
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break;
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}
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err: if (db_iop->mutexp != NULL)
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(void)__db_mutex_unlock(db_iop->mutexp, db_iop->fd_lock);
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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((int, void *, size_t, ssize_t *));
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*/
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int
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__os_read(fd, addr, len, nrp)
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int fd;
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void *addr;
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size_t len;
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ssize_t *nrp;
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{
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size_t offset;
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ssize_t nr;
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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(fd, taddr, len - offset) :
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read(fd, taddr, len - offset)) < 0)
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return (errno);
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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((int, void *, size_t, ssize_t *));
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*/
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int
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__os_write(fd, addr, len, nwp)
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int fd;
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const void *addr;
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size_t len;
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ssize_t *nwp;
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{
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size_t offset;
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ssize_t nw;
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const 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(fd, taddr, len - offset) :
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write(fd, taddr, len - offset)) < 0)
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return (errno);
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*nwp = len;
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return (0);
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}
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