FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/open.c

     /*      $NetBSD: open.c,v 1.23 2003/08/07 16:32:29 agc Exp $    */
     
     /*-
      * Copyright (c) 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)open.c      8.1 (Berkeley) 6/11/93
     *  
     *
     * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
     * All Rights Reserved.
     *
     * Author: Alessandro Forin
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     */
    
    #include "stand.h"
    
    /*
     *      File primitives proper
     */
    
    #ifdef HELLO_CTAGS
    oopen(){}
    #endif
    
    int
    #ifndef __INTERNAL_LIBSA_CREAD
    open(fname, mode)
    #else
    oopen(fname, mode)
    #endif
            const char *fname;
            int mode;
    {
            struct open_file *f;
            int fd, error;
    #if !defined(LIBSA_SINGLE_FILESYSTEM)
            int i, besterror;
    #endif
            char *file;
    
            /* find a free file descriptor */
            for (fd = 0, f = files; fd < SOPEN_MAX; fd++, f++)
                    if (f->f_flags == 0)
                            goto fnd;
            errno = EMFILE;
            return (-1);
    fnd:
            /*
             * Try to open the device.
             * Convert open mode (0,1,2) to F_READ, F_WRITE.
             */
           f->f_flags = mode + 1;
   #if !defined(LIBSA_SINGLE_DEVICE)
           f->f_dev = (struct devsw *)0;
   #endif
   #if !defined(LIBSA_SINGLE_FILESYSTEM)
           f->f_ops = (struct fs_ops *)0;
   #endif
   #if !defined(LIBSA_NO_RAW_ACCESS)
           f->f_offset = 0;
   #endif
           file = (char *)0;
           error = devopen(f, fname, &file);
           if (error
   #if !defined(LIBSA_SINGLE_DEVICE)
               || (((f->f_flags & F_NODEV) == 0) &&
                   f->f_dev == (struct devsw *)0)
   #endif
               )
                   goto err;
   
   #if !defined(LIBSA_NO_RAW_ACCESS)
           /* see if we opened a raw device; otherwise, 'file' is the file name. */
           if (file == (char *)0 || *file == '\0') {
                   f->f_flags |= F_RAW;
                   return (fd);
           }
   #endif
   
           /* pass file name to the different filesystem open routines */
   #if !defined(LIBSA_SINGLE_FILESYSTEM)
           besterror = ENOENT;
           for (i = 0; i < nfsys; i++) {
                   error = FS_OPEN(&file_system[i])(file, f);
                   if (error == 0) {
                           f->f_ops = &file_system[i];
                           return (fd);
                   }
                   if (error != EINVAL)
                           besterror = error;
           }
           error = besterror;
   #else
           error = FS_OPEN(&file_system[i])(file, f);
           if (error == 0)
                   return (fd);
           if (error == EINVAL)
                   error = ENOENT;
   #endif
   
           if ((f->f_flags & F_NODEV) == 0) {
   #if !defined(LIBSA_SINGLE_DEVICE)
                   if (DEV_CLOSE(f->f_dev) != NULL)
   #endif
                           (void)DEV_CLOSE(f->f_dev)(f);
           }
   err:
           f->f_flags = 0;
           errno = error;
           return (-1);
   }

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