usr/src/lib/libproc/common/pr_ioctl.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1997-2000 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33 #include "libproc.h"
  34
  35 /*
  36  * ioctl() system call -- executed by subject process.
  37  */
  38 int
  39 pr_ioctl(struct ps_prochandle *Pr, int fd, int code, void *buf, size_t size)
  40 {
  41         sysret_t rval;                  /* return value from ioctl() */
  42         argdes_t argd[3];               /* arg descriptors for ioctl() */
  43         argdes_t *adp = &argd[0];       /* first argument */
  44         int error;
  45
  46         if (Pr == NULL)         /* no subject process */
  47                 return (ioctl(fd, code, buf));
  48
  49         adp->arg_value = fd;
  50         adp->arg_object = NULL;
  51         adp->arg_type = AT_BYVAL;
  52         adp->arg_inout = AI_INPUT;
  53         adp->arg_size = 0;
  54         adp++;                  /* move to code argument */
  55
  56         adp->arg_value = code;
  57         adp->arg_object = NULL;
  58         adp->arg_type = AT_BYVAL;
  59         adp->arg_inout = AI_INPUT;
  60         adp->arg_size = 0;
  61         adp++;                  /* move to buffer argument */
  62
  63         if (size == 0) {
  64                 adp->arg_value = (long)buf;
  65                 adp->arg_object = NULL;
  66                 adp->arg_type = AT_BYVAL;
  67                 adp->arg_inout = AI_INPUT;
  68                 adp->arg_size = 0;
  69         } else {
  70                 adp->arg_value = 0;
  71                 adp->arg_object = buf;
  72                 adp->arg_type = AT_BYREF;
  73                 adp->arg_inout = AI_INOUT;
  74                 adp->arg_size = size;
  75         }
  76
  77         error = Psyscall(Pr, &rval, SYS_ioctl, 3, &argd[0]);
  78
  79         if (error) {
  80                 errno = (error > 0)? error : ENOSYS;
  81                 return (-1);
  82         }
  83         return (rval.sys_rval1);
  84 }