usr/src/cmd/sendmail/db/include/os.h

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  *
   7  *      @(#)os.h        10.11 (Sleepycat) 10/12/98
   8  */
   9
  10 #pragma ident   "%Z%%M% %I%     %E% SMI"
  11
  12 /*
  13  * We group seek/write calls into a single function so that we can use
  14  * pread(2)/pwrite(2) where they're available.
  15  */
  16 #define DB_IO_READ      1
  17 #define DB_IO_WRITE     2
  18 typedef struct __io {
  19         int         fd_io;              /* I/O file descriptor. */
  20         int         fd_lock;            /* Locking file descriptor. */
  21         db_mutex_t *mutexp;             /* Mutex to lock. */
  22         size_t      pagesize;           /* Page size. */
  23         db_pgno_t   pgno;               /* Page number. */
  24         u_int8_t   *buf;                /* Buffer. */
  25         size_t      bytes;              /* Bytes read/written. */
  26 } DB_IO;