sys/sys5/fcntl.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1990-1996 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#ident  "%Z%%M% %I% %E% SMI"

#include <sys/syscall.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <sys/filio.h>
#include <sys/ioccom.h>
#include <unistd.h>

/* The following is an array of fcntl commands. The numbers listed
 * below are from SVR4. Array is indexed with SunOS 4.1 numbers to
 * obtain the SVR4 numbers.
 */
int cmd_op[14] = {0, 1, 2, 3, 4, 23, 24, 14, 6, 7, 21, 20, -1, 22};

/* SVR4/SunOS 5.0 equivalent modes */
#define N_O_NDELAY  0x04
#define N_O_SYNC    0x10
#define N_O_NONBLOCK    0x80
#define N_O_CREAT   0x100
#define N_O_TRUNC   0x200
#define N_O_EXCL    0x400

#define S5_FASYNC 0x1000

/* from SVR4 stropts.h */
#define S5_S_RDNORM     0x0040
#define S5_S_WRNORM     0x0004
#define S5_S_RDBAND     0x0080
#define S5_S_BANDURG        0x0200
#define S5_I_SETSIG     (('S'<<8)|011)
#define S5_I_GETSIG     (('S'<<8)|012)

/* Mask corresponding to the bits above in SunOS 4.x */
#define FLAGS_MASK  (O_SYNC|O_NONBLOCK|O_CREAT|O_TRUNC|O_EXCL \
            |O_NDELAY|FASYNC)
#define N_FLAGS_MASK    (N_O_NDELAY|N_O_SYNC|N_O_NONBLOCK|N_O_CREAT \
            |N_O_TRUNC|N_O_EXCL|S5_FASYNC)

struct n_flock {
        short   l_type;
        short   l_whence;
        long    l_start;
        long    l_len;          /* len == 0 means until end of file */
        long    l_sysid;
        long    l_pid;
        long    pad[4];         /* reserve area */
} ;

int fcntl(fd, cmd, arg)
int fd, cmd, arg;
{
    return(bc_fcntl(fd, cmd, arg));
}

int bc_fcntl(fd, cmd, arg)
int fd, cmd, arg;
{
    int fds, ret;
    struct flock *savarg;
    struct n_flock nfl;
    extern int errno;
    int narg, i;

    if ((cmd == F_SETOWN) || (cmd == F_GETOWN)) {
        ret = _s_fcntl(fd, cmd_op[cmd], arg);
        if ((ret != -1) || (errno != EINVAL))
            return (ret);
        else {
            if (cmd == F_GETOWN) {
                if (_ioctl(fd, S5_I_GETSIG, &i) < 0) {
                    if (errno == EINVAL)
                        i = 0;
                    else
                        return (-1);
                }
                if (i & (S5_S_RDBAND|S5_S_BANDURG|
                    S5_S_RDNORM|S5_S_WRNORM))
                    return (getpid());
                return (0);
            } else { /* cmd == F_SETOWN */
                i = S5_S_RDNORM|S5_S_WRNORM|S5_S_RDBAND|S5_S_BANDURG;
                return (ioctl(fd, S5_I_SETSIG, i));
            }
        }
    }
    if (cmd == F_SETFL) {
        if (arg & FLAGS_MASK) {
            narg = arg & ~FLAGS_MASK;
            if (arg & FASYNC)
                narg |= S5_FASYNC;
            if (arg & O_SYNC)
                narg |= N_O_SYNC;
            if (arg & O_CREAT)
                narg |= N_O_CREAT;
            if (arg & O_TRUNC)
                narg |= N_O_TRUNC;
            if (arg & O_EXCL)
                narg |= N_O_EXCL;
            if (arg & (O_NDELAY))
                narg |= N_O_NDELAY;
            if (arg & O_NONBLOCK)
                narg |= N_O_NONBLOCK;
            arg = narg;
        }
        } else if (cmd == F_SETLK || cmd == F_SETLKW || cmd == F_GETLK)  {
        if (arg == 0 || arg == -1) {
            errno = EFAULT;
            return(-1);
        }
        savarg = (struct flock *)arg;
        arg = (int) &nfl;
        nfl.l_type = savarg->l_type;
        nfl.l_whence = savarg->l_whence;
        nfl.l_start = savarg->l_start;
        nfl.l_len = savarg->l_len;
        nfl.l_pid = savarg->l_pid;
    }

    ret = _s_fcntl(fd, cmd_op[cmd], arg);

    if (ret != -1) {
        if (cmd == F_DUPFD) {
            if ((fds = fd_get(fd)) != -1)
                fd_add(ret, fds);
            } else if (cmd == F_GETFL) {
            if (ret & N_FLAGS_MASK) {
                narg = ret & ~N_FLAGS_MASK;
                if (ret & S5_FASYNC)
                    narg |= FASYNC;
                if (ret & N_O_SYNC)
                    narg |= O_SYNC;
                if (ret & N_O_NONBLOCK)
                    narg |= O_NONBLOCK;
                if (ret & N_O_CREAT)
                    narg |= O_CREAT;
                if (ret & N_O_TRUNC)
                    narg |= O_TRUNC;
                if (ret & N_O_EXCL)
                    narg |= O_EXCL;
                if (ret & (N_O_NDELAY))
                    narg |= O_NDELAY;
                ret = narg;
            }
        } else if (cmd == F_SETLK || cmd == F_SETLKW ||
            cmd == F_GETLK) {
            savarg->l_type = nfl.l_type;
            savarg->l_whence = nfl.l_whence;
            savarg->l_start = nfl.l_start;
            savarg->l_len = nfl.l_len;
            savarg->l_pid = nfl.l_pid;
        }
    }
        return(ret);
}