xref: /titanic_50/usr/src/lib/libproc/common/pr_open.c (revision b56bf881a9655cb27b53cba1468312f7c6dfb0a2)
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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #include <stdlib.h>
28 #include <unistd.h>
29 #include <string.h>
30 #include <fcntl.h>
31 #include <errno.h>
32 #include "libproc.h"
33 
34 /*
35  * open() system call -- executed by subject process.
36  */
37 int
38 pr_open(struct ps_prochandle *Pr, const char *filename, int flags, mode_t mode)
39 {
40 	sysret_t rval;			/* return value from openat() */
41 	argdes_t argd[4];		/* arg descriptors for openat() */
42 	argdes_t *adp;
43 	int error;
44 
45 	if (Pr == NULL)		/* no subject process */
46 		return (open(filename, flags, mode));
47 
48 	adp = &argd[0];		/* AT_FDCWD argument */
49 	adp->arg_value = AT_FDCWD;
50 	adp->arg_object = NULL;
51 	adp->arg_type = AT_BYVAL;
52 	adp->arg_inout = AI_INPUT;
53 	adp->arg_size = 0;
54 
55 	adp++;			/* filename argument */
56 	adp->arg_value = 0;
57 	adp->arg_object = (void *)filename;
58 	adp->arg_type = AT_BYREF;
59 	adp->arg_inout = AI_INPUT;
60 	adp->arg_size = strlen(filename)+1;
61 
62 	adp++;			/* flags argument */
63 	adp->arg_value = (long)flags;
64 	adp->arg_object = NULL;
65 	adp->arg_type = AT_BYVAL;
66 	adp->arg_inout = AI_INPUT;
67 	adp->arg_size = 0;
68 
69 	adp++;			/* mode argument */
70 	adp->arg_value = (long)mode;
71 	adp->arg_object = NULL;
72 	adp->arg_type = AT_BYVAL;
73 	adp->arg_inout = AI_INPUT;
74 	adp->arg_size = 0;
75 
76 	error = Psyscall(Pr, &rval, SYS_openat, 4, &argd[0]);
77 
78 	if (error) {
79 		errno = (error > 0)? error : ENOSYS;
80 		return (-1);
81 	}
82 	return (rval.sys_rval1);
83 }
84 
85 /*
86  * creat() system call -- executed by subject process.
87  */
88 int
89 pr_creat(struct ps_prochandle *Pr, const char *filename, mode_t mode)
90 {
91 	sysret_t rval;			/* return value from openat() */
92 	argdes_t argd[4];		/* arg descriptors for openat() */
93 	argdes_t *adp;
94 	int error;
95 
96 	if (Pr == NULL)		/* no subject process */
97 		return (creat(filename, mode));
98 
99 	adp = &argd[0];		/* AT_FDCWD argument */
100 	adp->arg_value = AT_FDCWD;
101 	adp->arg_object = NULL;
102 	adp->arg_type = AT_BYVAL;
103 	adp->arg_inout = AI_INPUT;
104 	adp->arg_size = 0;
105 
106 	adp++;			/* filename argument */
107 	adp->arg_value = 0;
108 	adp->arg_object = (void *)filename;
109 	adp->arg_type = AT_BYREF;
110 	adp->arg_inout = AI_INPUT;
111 	adp->arg_size = strlen(filename)+1;
112 
113 	adp++;			/* flags argument */
114 	adp->arg_value = (O_WRONLY | O_CREAT | O_TRUNC);
115 	adp->arg_object = NULL;
116 	adp->arg_type = AT_BYVAL;
117 	adp->arg_inout = AI_INPUT;
118 	adp->arg_size = 0;
119 
120 	adp++;			/* mode argument */
121 	adp->arg_value = (long)mode;
122 	adp->arg_object = NULL;
123 	adp->arg_type = AT_BYVAL;
124 	adp->arg_inout = AI_INPUT;
125 	adp->arg_size = 0;
126 
127 	error = Psyscall(Pr, &rval, SYS_openat, 4, &argd[0]);
128 
129 	if (error) {
130 		errno = (error > 0)? error : ENOSYS;
131 		return (-1);
132 	}
133 	return (rval.sys_rval1);
134 }
135 
136 /*
137  * close() system call -- executed by subject process.
138  */
139 int
140 pr_close(struct ps_prochandle *Pr, int fd)
141 {
142 	sysret_t rval;			/* return value from close() */
143 	argdes_t argd[1];		/* arg descriptors for close() */
144 	argdes_t *adp;
145 	int error;
146 
147 	if (Pr == NULL)		/* no subject process */
148 		return (close(fd));
149 
150 	adp = &argd[0];		/* fd argument */
151 	adp->arg_value = (int)fd;
152 	adp->arg_object = NULL;
153 	adp->arg_type = AT_BYVAL;
154 	adp->arg_inout = AI_INPUT;
155 	adp->arg_size = 0;
156 
157 	error = Psyscall(Pr, &rval, SYS_close, 1, &argd[0]);
158 
159 	if (error) {
160 		errno = (error > 0)? error : ENOSYS;
161 		return (-1);
162 	}
163 	return (rval.sys_rval1);
164 }
165 
166 /*
167  * access() system call -- executed by subject process.
168  */
169 int
170 pr_access(struct ps_prochandle *Pr, const char *path, int amode)
171 {
172 	sysret_t rval;			/* return from access() */
173 	argdes_t argd[4];		/* arg descriptors for access() */
174 	argdes_t *adp;
175 	int err;
176 
177 	if (Pr == NULL)		/* no subject process */
178 		return (access(path, amode));
179 
180 	adp = &argd[0];		/* directory fd argument */
181 	adp->arg_value = AT_FDCWD;
182 	adp->arg_object = NULL;
183 	adp->arg_type = AT_BYVAL;
184 	adp->arg_inout = AI_INPUT;
185 	adp->arg_size = 0;
186 
187 	adp++;			/* path argument */
188 	adp->arg_value = 0;
189 	adp->arg_object = (void *)path;
190 	adp->arg_type = AT_BYREF;
191 	adp->arg_inout = AI_INPUT;
192 	adp->arg_size = strlen(path) + 1;
193 
194 	adp++;			/* amode argument */
195 	adp->arg_value = (long)amode;
196 	adp->arg_object = NULL;
197 	adp->arg_type = AT_BYVAL;
198 	adp->arg_inout = AI_INPUT;
199 	adp->arg_size = 0;
200 
201 	adp++;			/* flag argument */
202 	adp->arg_value = 0;
203 	adp->arg_object = NULL;
204 	adp->arg_type = AT_BYVAL;
205 	adp->arg_inout = AI_INPUT;
206 	adp->arg_size = 0;
207 
208 	err = Psyscall(Pr, &rval, SYS_faccessat, 4, &argd[0]);
209 
210 	if (err) {
211 		errno = (err > 0) ? err : ENOSYS;
212 		return (-1);
213 	}
214 
215 	return (rval.sys_rval1);
216 }
217