xref: /illumos-gate/usr/src/lib/libproc/common/pr_ioctl.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
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 #include <stdlib.h>
28 #include <unistd.h>
29 #include <errno.h>
30 #include <sys/types.h>
31 #include "libproc.h"
32 
33 /*
34  * ioctl() system call -- executed by subject process.
35  */
36 int
pr_ioctl(struct ps_prochandle * Pr,int fd,int code,void * buf,size_t size)37 pr_ioctl(struct ps_prochandle *Pr, int fd, int code, void *buf, size_t size)
38 {
39 	sysret_t rval;			/* return value from ioctl() */
40 	argdes_t argd[3];		/* arg descriptors for ioctl() */
41 	argdes_t *adp = &argd[0];	/* first argument */
42 	int error;
43 
44 	if (Pr == NULL)		/* no subject process */
45 		return (ioctl(fd, code, buf));
46 
47 	adp->arg_value = fd;
48 	adp->arg_object = NULL;
49 	adp->arg_type = AT_BYVAL;
50 	adp->arg_inout = AI_INPUT;
51 	adp->arg_size = 0;
52 	adp++;			/* move to code argument */
53 
54 	adp->arg_value = code;
55 	adp->arg_object = NULL;
56 	adp->arg_type = AT_BYVAL;
57 	adp->arg_inout = AI_INPUT;
58 	adp->arg_size = 0;
59 	adp++;			/* move to buffer argument */
60 
61 	if (size == 0) {
62 		adp->arg_value = (long)buf;
63 		adp->arg_object = NULL;
64 		adp->arg_type = AT_BYVAL;
65 		adp->arg_inout = AI_INPUT;
66 		adp->arg_size = 0;
67 	} else {
68 		adp->arg_value = 0;
69 		adp->arg_object = buf;
70 		adp->arg_type = AT_BYREF;
71 		adp->arg_inout = AI_INOUT;
72 		adp->arg_size = size;
73 	}
74 
75 	error = Psyscall(Pr, &rval, SYS_ioctl, 3, &argd[0]);
76 
77 	if (error) {
78 		errno = (error > 0)? error : ENOSYS;
79 		return (-1);
80 	}
81 	return (rval.sys_rval1);
82 }
83