libproc/common/pr_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) 1997-2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

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

#include <sys/isa_defs.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "libproc.h"

/*
 * fcntl() system call -- executed by subject process.
 */
int
pr_fcntl(struct ps_prochandle *Pr, int fd, int cmd, void *argp)
{
    sysret_t rval;          /* return value from fcntl() */
    argdes_t argd[3];       /* arg descriptors for fcntl() */
    argdes_t *adp;
    int error;

    if (Pr == NULL)     /* no subject process */
        return (fcntl(fd, cmd, argp));

    adp = &argd[0];     /* file descriptor argument */
    adp->arg_value = fd;
    adp->arg_object = NULL;
    adp->arg_type = AT_BYVAL;
    adp->arg_inout = AI_INPUT;
    adp->arg_size = 0;

    adp++;          /* cmd argument */
#ifdef _LP64
    if (Pstatus(Pr)->pr_dmodel == PR_MODEL_ILP32) {
        /*
         * Guilty knowledge of the large file compilation environment
         */
        switch (cmd) {
        case F_GETLK:
            cmd = 33;
            break;
        case F_SETLK:
            cmd = 34;
            break;
        case F_SETLKW:
            cmd = 35;
            break;
        case F_FREESP:
            cmd = 27;
            break;
        }
    }
#endif  /* _LP64 */
    adp->arg_value = cmd;
    adp->arg_object = NULL;
    adp->arg_type = AT_BYVAL;
    adp->arg_inout = AI_INPUT;
    adp->arg_size = 0;

    adp++;          /* argp argument */
    if (argp == NULL) {
        adp->arg_value = 0;
        adp->arg_object = NULL;
        adp->arg_type = AT_BYVAL;
        adp->arg_inout = AI_INPUT;
        adp->arg_size = 0;
    } else {
        adp->arg_value = 0;
        adp->arg_object = argp;
        adp->arg_type = AT_BYREF;
        adp->arg_inout = AI_INOUT;
        switch (cmd) {
        case F_GETLK:
        case F_SETLK:
        case F_SETLKW:
        case F_ALLOCSP:
        case F_FREESP:
            adp->arg_size = sizeof (struct flock);
            break;
#ifdef _LP64
        case 33:
        case 34:
        case 35:
        case 27:
            adp->arg_size = sizeof (struct flock64_32);
#else   /* _LP64 */
        case F_GETLK64:
        case F_SETLK64:
        case F_SETLKW64:
        case F_FREESP64:
            adp->arg_size = sizeof (struct flock64);
#endif  /* _LP64 */
            break;
        case F_SHARE:
        case F_UNSHARE:
            adp->arg_size = sizeof (struct fshare);
            break;
        default:
            adp->arg_value = (long)argp;
            adp->arg_object = NULL;
            adp->arg_type = AT_BYVAL;
            adp->arg_inout = AI_INPUT;
            adp->arg_size = 0;
            break;
        }
    }

    error = Psyscall(Pr, &rval, SYS_fcntl, 3, &argd[0]);

    if (error) {
        errno = (error > 0)? error : ENOSYS;
        return (-1);
    }
    return (rval.sys_rval1);
}