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 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26 /*
27 * Copyright (c) 2013 by Delphix. All rights reserved.
28 */
29
30 #include <limits.h>
31 #include <string.h>
32 #include <stdarg.h>
33 #include <stdio.h>
34 #include <errno.h>
35
36 #include "Pcontrol.h"
37 #include "Putil.h"
38
39 /*
40 * Place the new element on the list prior to the existing element.
41 */
42 void
43 list_link(void *new, void *existing)
44 {
45 plist_t *p = new;
46 plist_t *q = existing;
47
48 if (q) {
49 p->list_forw = q;
50 p->list_back = q->list_back;
51 q->list_back->list_forw = p;
52 q->list_back = p;
53 } else {
54 p->list_forw = p->list_back = p;
55 }
56 }
57
58 /*
59 * Unchain the specified element from a list.
60 */
61 void
62 list_unlink(void *old)
63 {
64 plist_t *p = old;
65
66 if (p->list_forw != p) {
67 p->list_back->list_forw = p->list_forw;
68 p->list_forw->list_back = p->list_back;
69 }
70 p->list_forw = p->list_back = p;
71 }
72
73 /*
74 * Routines to manipulate sigset_t, fltset_t, or sysset_t. These routines
75 * are provided as equivalents for the <sys/procfs.h> macros prfillset,
76 * premptyset, praddset, and prdelset. These functions are preferable
77 * because they are not macros which rely on using sizeof (*sp), and thus
78 * can be used to create common code to manipulate event sets. The set
79 * size must be passed explicitly, e.g. : prset_fill(&set, sizeof (set));
80 */
81 void
82 prset_fill(void *sp, size_t size)
83 {
84 size_t i = size / sizeof (uint32_t);
85
86 while (i != 0)
87 ((uint32_t *)sp)[--i] = (uint32_t)0xFFFFFFFF;
88 }
89
90 void
91 prset_empty(void *sp, size_t size)
92 {
93 size_t i = size / sizeof (uint32_t);
94
95 while (i != 0)
96 ((uint32_t *)sp)[--i] = (uint32_t)0;
97 }
98
99 void
100 prset_add(void *sp, size_t size, uint_t flag)
101 {
102 if (flag - 1 < 32 * size / sizeof (uint32_t))
103 ((uint32_t *)sp)[(flag - 1) / 32] |= 1U << ((flag - 1) % 32);
104 }
105
106 void
107 prset_del(void *sp, size_t size, uint_t flag)
108 {
109 if (flag - 1 < 32 * size / sizeof (uint32_t))
110 ((uint32_t *)sp)[(flag - 1) / 32] &= ~(1U << ((flag - 1) % 32));
111 }
112
113 int
114 prset_ismember(void *sp, size_t size, uint_t flag)
115 {
116 return ((flag - 1 < 32 * size / sizeof (uint32_t)) &&
117 (((uint32_t *)sp)[(flag - 1) / 32] & (1U << ((flag - 1) % 32))));
118 }
119
120 /*
121 * If _libproc_debug is set, printf the debug message to stderr
122 * with an appropriate prefix.
123 */
124 /*PRINTFLIKE1*/
125 void
126 dprintf(const char *format, ...)
127 {
128 if (_libproc_debug) {
129 va_list alist;
130
131 va_start(alist, format);
132 (void) fputs("libproc DEBUG: ", stderr);
133 (void) vfprintf(stderr, format, alist);
134 va_end(alist);
135 }
136 }
137
138 /*
139 * Printf-style error reporting function. This is used to supplement the error
140 * return codes from various libproc functions with additional text. Since we
141 * are a library, and should not be spewing messages to stderr, we provide a
142 * default version of this function that does nothing, but by calling this
143 * function we allow the client program to define its own version of the
144 * function that will interpose on our empty default. This may be useful for
145 * clients that wish to display such messages to the user.
146 */
147 /*ARGSUSED*/
148 /*PRINTFLIKE2*/
149 void
150 Perror_printf(struct ps_prochandle *P, const char *format, ...)
151 {
152 /* nothing to do here */
153 }
154
155 /*
156 * Default operations.
157 */
158 static ssize_t
159 Pdefault_ssizet()
160 {
161 return (-1);
162 }
163
164 static int
165 Pdefault_int()
166 {
167 return (-1);
168 }
169
170 static void
171 Pdefault_void()
172 {
173 }
174
175 static void *
176 Pdefault_voidp()
177 {
178 return (NULL);
179 }
180
181 static const ps_ops_t P_default_ops = {
182 .pop_pread = (pop_pread_t)Pdefault_ssizet,
183 .pop_pwrite = (pop_pwrite_t)Pdefault_ssizet,
184 .pop_read_maps = (pop_read_maps_t)Pdefault_int,
185 .pop_read_aux = (pop_read_aux_t)Pdefault_void,
186 .pop_cred = (pop_cred_t)Pdefault_int,
187 .pop_priv = (pop_priv_t)Pdefault_int,
188 .pop_psinfo = (pop_psinfo_t)Pdefault_voidp,
189 .pop_status = (pop_status_t)Pdefault_void,
190 .pop_lstatus = (pop_lstatus_t)Pdefault_voidp,
191 .pop_lpsinfo = (pop_lpsinfo_t)Pdefault_voidp,
192 .pop_fini = (pop_fini_t)Pdefault_void,
193 .pop_platform = (pop_platform_t)Pdefault_voidp,
194 .pop_uname = (pop_uname_t)Pdefault_int,
195 .pop_zonename = (pop_zonename_t)Pdefault_voidp,
196 .pop_execname = (pop_execname_t)Pdefault_voidp,
197 #if defined(__i386) || defined(__amd64)
198 .pop_ldt = (pop_ldt_t)Pdefault_int
199 #endif
200 };
201
202 /*
203 * Initialize the destination ops vector with functions from the source.
204 * Functions which are NULL in the source ops vector are set to corresponding
205 * default function in the destination vector.
206 */
207 void
208 Pinit_ops(ps_ops_t *dst, const ps_ops_t *src)
209 {
210 *dst = P_default_ops;
211
212 if (src->pop_pread != NULL)
213 dst->pop_pread = src->pop_pread;
214 if (src->pop_pwrite != NULL)
215 dst->pop_pwrite = src->pop_pwrite;
216 if (src->pop_read_maps != NULL)
217 dst->pop_read_maps = src->pop_read_maps;
218 if (src->pop_read_aux != NULL)
219 dst->pop_read_aux = src->pop_read_aux;
220 if (src->pop_cred != NULL)
221 dst->pop_cred = src->pop_cred;
222 if (src->pop_priv != NULL)
223 dst->pop_priv = src->pop_priv;
224 if (src->pop_psinfo != NULL)
225 dst->pop_psinfo = src->pop_psinfo;
226 if (src->pop_status != NULL)
227 dst->pop_status = src->pop_status;
228 if (src->pop_lstatus != NULL)
229 dst->pop_lstatus = src->pop_lstatus;
230 if (src->pop_lpsinfo != NULL)
231 dst->pop_lpsinfo = src->pop_lpsinfo;
232 if (src->pop_fini != NULL)
233 dst->pop_fini = src->pop_fini;
234 if (src->pop_platform != NULL)
235 dst->pop_platform = src->pop_platform;
236 if (src->pop_uname != NULL)
237 dst->pop_uname = src->pop_uname;
238 if (src->pop_zonename != NULL)
239 dst->pop_zonename = src->pop_zonename;
240 if (src->pop_execname != NULL)
241 dst->pop_execname = src->pop_execname;
242 #if defined(__i386) || defined(__amd64)
243 if (src->pop_ldt != NULL)
244 dst->pop_ldt = src->pop_ldt;
245 #endif
246 }