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Annotation of Gnu-Mach/i386/dos/dos_fstat.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995-1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: 
        !            24: #include <unistd.h>
        !            25: #include <errno.h>
        !            26: #include <string.h>
        !            27: #include <sys/stat.h>
        !            28: 
        !            29: #include "dos_io.h"
        !            30: 
        !            31: int dos_fstat(dos_fd_t fd, struct stat *st)
        !            32: {
        !            33:        int err;
        !            34:        int actual = 0;
        !            35:        struct real_call_data real_call_data;
        !            36:        vm_offset_t old_pos, new_pos;
        !            37: 
        !            38:        dos_init_rcd(&real_call_data);
        !            39: 
        !            40:        bzero(st, sizeof(*st));
        !            41:        st->st_nlink = 1;
        !            42:        st->st_mode = S_IRWXU | S_IRWXG | S_IRWXO; /* XXX attributes */
        !            43: 
        !            44:        /* Get device information,
        !            45:           which will tell us whether this is a character device
        !            46:           or a regular file.  */
        !            47:        real_call_data.eax = 0x4400;
        !            48:        real_call_data.ebx = fd;
        !            49:        real_int(0x21, &real_call_data);
        !            50:        if (err = dos_check_err(&real_call_data))
        !            51:                return err;
        !            52:        if (real_call_data.edx & (1<<7))
        !            53:                st->st_mode |= S_IFCHR;
        !            54:        else
        !            55:                st->st_mode |= S_IFREG;
        !            56: 
        !            57:        /* XXX get date/time with int 21 5700 */
        !            58: 
        !            59:        /* Get file size by seeking to the end and back.  */
        !            60:        if (!dos_seek(fd, 0, 1, &old_pos)
        !            61:            && !dos_seek(fd, 0, 2, &st->st_size))
        !            62:        {
        !            63:                if (err = dos_seek(fd, old_pos, 0, &new_pos))
        !            64:                        return err;
        !            65:                if (new_pos != old_pos)
        !            66:                        return EIO;/*XXX*/
        !            67:        }
        !            68: 
        !            69:        /* Always assume 512-byte blocks for now... */
        !            70:        st->st_blocks = (st->st_size + 511) / 512;
        !            71:        st->st_blksize = 512;
        !            72: 
        !            73:        return 0;
        !            74: }
        !            75: 

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