os_oflags.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: os_oflags.c,v 12.2 2005/06/16 20:23:26 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/stat.h>

#ifdef HAVE_SHMGET
#include <sys/ipc.h>
#include <sys/shm.h>
#endif

#include <fcntl.h>
#endif

#include "db_int.h"

/*
 * __db_oflags --
 *      Convert open(2) flags to DB flags.
 *
 * PUBLIC: u_int32_t __db_oflags __P((int));
 */
u_int32_t
__db_oflags(oflags)
        int oflags;
{
        u_int32_t dbflags;

        dbflags = 0;

        if (oflags & O_CREAT)
                dbflags |= DB_CREATE;

        if (oflags & O_TRUNC)
                dbflags |= DB_TRUNCATE;

        /*
         * !!!
         * Convert POSIX 1003.1 open(2) mode flags to DB flags.  This isn't
         * an exact science as few POSIX implementations have a flag value
         * for O_RDONLY, it's simply the lack of a write flag.
         */
#ifndef O_ACCMODE
#define O_ACCMODE       (O_RDONLY | O_RDWR | O_WRONLY)
#endif
        switch (oflags & O_ACCMODE) {
        case O_RDWR:
        case O_WRONLY:
                break;
        default:
                dbflags |= DB_RDONLY;
                break;
        }
        return (dbflags);
}

#ifdef DB_WIN32
#ifndef S_IRUSR
#define S_IRUSR S_IREAD         /* R for owner */
#endif
#ifndef S_IWUSR
#define S_IWUSR S_IWRITE        /* W for owner */
#endif
#ifndef S_IXUSR
#define S_IXUSR 0               /* X for owner */
#endif
#ifndef S_IRGRP
#define S_IRGRP 0               /* R for group */
#endif
#ifndef S_IWGRP
#define S_IWGRP 0               /* W for group */
#endif
#ifndef S_IXGRP
#define S_IXGRP 0               /* X for group */
#endif
#ifndef S_IROTH
#define S_IROTH 0               /* R for other */
#endif
#ifndef S_IWOTH
#define S_IWOTH 0               /* W for other */
#endif
#ifndef S_IXOTH
#define S_IXOTH 0               /* X for other */
#endif
#else
#ifndef S_IRUSR
#define S_IRUSR 0000400         /* R for owner */
#endif
#ifndef S_IWUSR
#define S_IWUSR 0000200         /* W for owner */
#endif
#ifndef S_IXUSR
#define S_IXUSR 0000100         /* X for owner */
#endif
#ifndef S_IRGRP
#define S_IRGRP 0000040         /* R for group */
#endif
#ifndef S_IWGRP
#define S_IWGRP 0000020         /* W for group */
#endif
#ifndef S_IXGRP
#define S_IXGRP 0000010         /* X for group */
#endif
#ifndef S_IROTH
#define S_IROTH 0000004         /* R for other */
#endif
#ifndef S_IWOTH
#define S_IWOTH 0000002         /* W for other */
#endif
#ifndef S_IXOTH
#define S_IXOTH 0000001         /* X for other */
#endif
#endif /* DB_WIN32 */

/*
 * __db_omode --
 *      Convert a permission string to the correct open(2) flags.
 *
 * PUBLIC: int __db_omode __P((const char *));
 */
int
__db_omode(perm)
        const char *perm;
{
        int mode;
        mode = 0;
        if (perm[0] == 'r')
                mode |= S_IRUSR;
        if (perm[1] == 'w')
                mode |= S_IWUSR;
        if (perm[2] == 'x')
                mode |= S_IXUSR;
        if (perm[3] == 'r')
                mode |= S_IRGRP;
        if (perm[4] == 'w')
                mode |= S_IWGRP;
        if (perm[5] == 'x')
                mode |= S_IXGRP;
        if (perm[6] == 'r')
                mode |= S_IROTH;
        if (perm[7] == 'w')
                mode |= S_IWOTH;
        if (perm[8] == 'x')
                mode |= S_IXOTH;
        return (mode);
}

#ifdef HAVE_SHMGET

#ifndef SHM_R
#define SHM_R   0400
#endif
#ifndef SHM_W
#define SHM_W   0200
#endif

/*
 * __db_shm_mode --
 *      Map the DbEnv::open method file mode permissions to shmget call
 *      permissions.
 *
 * PUBLIC: int __db_shm_mode __P((DB_ENV *));
 */
int
__db_shm_mode(dbenv)
        DB_ENV *dbenv;
{
        int mode;

        /* Default to r/w owner, r/w group. */
        if (dbenv->db_mode == 0)
                return (SHM_R | SHM_W | SHM_R >> 3 | SHM_W >> 3);

        mode = 0;
        if (dbenv->db_mode & S_IRUSR)
                mode |= SHM_R;
        if (dbenv->db_mode & S_IWUSR)
                mode |= SHM_W;
        if (dbenv->db_mode & S_IRGRP)
                mode |= SHM_R >> 3;
        if (dbenv->db_mode & S_IWGRP)
                mode |= SHM_W >> 3;
        if (dbenv->db_mode & S_IROTH)
                mode |= SHM_R >> 6;
        if (dbenv->db_mode & S_IWOTH)
                mode |= SHM_W >> 6;
        return (mode);
}
#endif

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