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Annotation of coherent/d/PS2_KERNEL/coh.386/fd.c, revision 1.1

1.1     ! root        1: /* $Header: /kernel/kersrc/coh.386/RCS/fd.c,v 1.2 92/08/04 12:30:49 bin Exp Locker: bin $ */
        !             2: /* (lgl-
        !             3:  *     The information contained herein is a trade secret of Mark Williams
        !             4:  *     Company, and  is confidential information.  It is provided  under a
        !             5:  *     license agreement,  and may be  copied or disclosed  only under the
        !             6:  *     terms of  that agreement.  Any  reproduction or disclosure  of this
        !             7:  *     material without the express written authorization of Mark Williams
        !             8:  *     Company or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     COHERENT Version 2.3.37
        !            11:  *     Copyright (c) 1982, 1983, 1984.
        !            12:  *     An unpublished work by Mark Williams Company, Chicago.
        !            13:  *     All rights reserved.
        !            14:  -lgl) */
        !            15: /*
        !            16:  * Coherent.
        !            17:  * File descriptor routines.
        !            18:  *
        !            19:  * $Log:       fd.c,v $
        !            20:  * Revision 1.2  92/08/04  12:30:49  bin
        !            21:  * changed for kernel 59
        !            22:  * 
        !            23:  * Revision 1.3  92/06/10  12:52:39  hal
        !            24:  * First record locking changes.
        !            25:  * 
        !            26:  * Revision 1.2  92/01/06  11:59:07  hal
        !            27:  * Compile with cc.mwc.
        !            28:  * 
        !            29:  * Revision 1.1        88/03/24  16:13:43      src
        !            30:  * Initial revision
        !            31:  * 
        !            32:  */
        !            33: #include <sys/coherent.h>
        !            34: #include <errno.h>
        !            35: #include <fcntl.h>
        !            36: #include <sys/fd.h>
        !            37: #include <sys/inode.h>
        !            38: 
        !            39: /*
        !            40:  * Given a file number, return the file descriptor.
        !            41:  */
        !            42: FD *
        !            43: fdget(fd)
        !            44: register unsigned fd;
        !            45: {
        !            46:        register FD *fdp;
        !            47: 
        !            48:        if (fd>=NUFILE || (fdp=u.u_filep[fd])==NULL) {
        !            49:                u.u_error = EBADF;
        !            50:                return (NULL);
        !            51:        }
        !            52:        return (fdp);
        !            53: }
        !            54: 
        !            55: /*
        !            56:  * Given an inode, and a mode containing permission flags, open the
        !            57:  * inode with the appropriate permissions and return a file descriptor
        !            58:  * containing it.
        !            59:  */
        !            60: fdopen(ip, mode)
        !            61: register INODE *ip;
        !            62: {
        !            63:        register FD **fdpp;
        !            64:        register FD *fdp;
        !            65: 
        !            66:        for (fdpp=u.u_filep; fdpp<&u.u_filep[NUFILE]; fdpp++) {
        !            67:                if (*fdpp != NULL)
        !            68:                        continue;
        !            69:                if ((fdp=kalloc(sizeof(FD))) == NULL)
        !            70:                        return (-1);
        !            71:                iopen(ip, mode);
        !            72:                if (u.u_error) {
        !            73:                        kfree(fdp);
        !            74:                        return (-1);
        !            75:                }
        !            76:                fdp->f_flag = mode;
        !            77:                fdp->f_flag2 = 0;
        !            78:                fdp->f_refc = 1;
        !            79:                fdp->f_seek = 0;
        !            80:                fdp->f_ip = ip;
        !            81:                *fdpp = fdp;
        !            82:                return (fdpp-u.u_filep);
        !            83:        }
        !            84:        u.u_error = EMFILE;
        !            85:        return (-1);
        !            86: }
        !            87: 
        !            88: /*
        !            89:  * Close the given file number.
        !            90:  */
        !            91: fdclose(fd)
        !            92: register unsigned fd;
        !            93: {
        !            94:        register FD *fdp;
        !            95:        static  FLOCK   flock = { F_UNLCK, 0, 0, 0 };
        !            96: 
        !            97:        if (fd>=NUFILE || (fdp=u.u_filep[fd])==NULL) {
        !            98:                u.u_error = EBADF;
        !            99:                return;
        !           100:        }
        !           101:        if (fdp->f_ip->i_rl != NULL)
        !           102:                rlock(fdp, F_SETLK, &flock);    /* delete all record locks */
        !           103:        u.u_filep[fd] = NULL;
        !           104:        if (fdp->f_refc == 0)
        !           105:                panic("fdclose()");
        !           106:        if (--fdp->f_refc == 0) {
        !           107:                iclose(fdp->f_ip);
        !           108:                kfree(fdp);
        !           109:        }
        !           110: }
        !           111: 
        !           112: /*
        !           113:  * Assuming we have made a copy of the user area, increment the reference
        !           114:  * of all open files.  (used in fork).
        !           115:  */
        !           116: fdadupl()
        !           117: {
        !           118:        register FD **fdpp;
        !           119:        register FD *fdp;
        !           120: 
        !           121:        for (fdpp=u.u_filep; fdpp<&u.u_filep[NUFILE]; fdpp++) {
        !           122:                if ((fdp=*fdpp) == NULL)
        !           123:                        continue;
        !           124:                fdp->f_refc++;
        !           125:        }
        !           126: }
        !           127: 
        !           128: /*
        !           129:  * Close all open files in the current process.
        !           130:  */
        !           131: fdaclose()
        !           132: {
        !           133:        register int fd;
        !           134: 
        !           135:        for (fd=0; fd<NUFILE; fd++) {
        !           136:                if (u.u_filep[fd] == NULL)
        !           137:                        continue;
        !           138:                fdclose(fd);
        !           139:        }
        !           140: }

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