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 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  * Copyright 2016 Joyent, Inc.
26  */
27 
28 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
29 /*	  All Rights Reserved	*/
30 
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <sys/sysmacros.h>
34 #include <sys/systm.h>
35 #include <sys/tuneable.h>
36 #include <sys/errno.h>
37 #include <sys/var.h>
38 #include <sys/signal.h>
39 #include <sys/time.h>
40 #include <sys/sysconfig.h>
41 #include <sys/resource.h>
42 #include <sys/ulimit.h>
43 #include <sys/unistd.h>
44 #include <sys/debug.h>
45 #include <sys/cpuvar.h>
46 #include <sys/mman.h>
47 #include <sys/timer.h>
48 #include <sys/zone.h>
49 #include <sys/vm_usage.h>
50 #include <vm/as.h>
51 
52 extern rctl_hndl_t rc_process_sigqueue;
53 
54 long
sysconfig(int which)55 sysconfig(int which)
56 {
57 	switch (which) {
58 
59 	/*
60 	 * if it is not handled in mach_sysconfig either
61 	 * it must be EINVAL.
62 	 */
63 	default:
64 		return (mach_sysconfig(which)); /* `uname -i`/os */
65 
66 	case _CONFIG_CLK_TCK:
67 		return ((long)hz);	/* clock frequency per second */
68 
69 	case _CONFIG_PROF_TCK:
70 		return ((long)hz);	/* profiling clock freq per sec */
71 
72 	case _CONFIG_NGROUPS:
73 		/*
74 		 * Maximum number of supplementary groups.
75 		 */
76 		return (ngroups_max);
77 
78 	case _CONFIG_OPEN_FILES:
79 		/*
80 		 * Maximum number of open files (soft limit).
81 		 */
82 		{
83 			rlim64_t fd_ctl;
84 			mutex_enter(&curproc->p_lock);
85 			fd_ctl = rctl_enforced_value(
86 			    rctlproc_legacy[RLIMIT_NOFILE], curproc->p_rctls,
87 			    curproc);
88 			mutex_exit(&curproc->p_lock);
89 			return ((ulong_t)fd_ctl);
90 		}
91 
92 	case _CONFIG_CHILD_MAX:
93 		/*
94 		 * Maximum number of processes.
95 		 */
96 		return (v.v_maxup);
97 
98 	case _CONFIG_POSIX_VER:
99 		return (_POSIX_VERSION); /* current POSIX version */
100 
101 	case _CONFIG_PAGESIZE:
102 		return (PAGESIZE);
103 
104 	case _CONFIG_XOPEN_VER:
105 		return (_XOPEN_VERSION); /* current XOPEN version */
106 
107 	case _CONFIG_NPROC_CONF:
108 		return (zone_ncpus_get(curproc->p_zone));
109 
110 	case _CONFIG_NPROC_ONLN:
111 		return (zone_ncpus_online_get(curproc->p_zone));
112 
113 	case _CONFIG_NPROC_MAX:
114 		return (max_ncpus);
115 
116 	case _CONFIG_NPROC_NCPU:
117 		return (NCPU); /* Private sysconfig for direct NCPU access */
118 
119 	case _CONFIG_STACK_PROT:
120 		return (curproc->p_stkprot & ~PROT_USER);
121 
122 	case _CONFIG_AIO_LISTIO_MAX:
123 		return (_AIO_LISTIO_MAX);
124 
125 	case _CONFIG_AIO_MAX:
126 		return (_AIO_MAX);
127 
128 	case _CONFIG_AIO_PRIO_DELTA_MAX:
129 		return (0);
130 
131 	case _CONFIG_DELAYTIMER_MAX:
132 		return (INT_MAX);
133 
134 	case _CONFIG_MQ_OPEN_MAX:
135 		return (_MQ_OPEN_MAX);
136 
137 	case _CONFIG_MQ_PRIO_MAX:
138 		return (_MQ_PRIO_MAX);
139 
140 	case _CONFIG_RTSIG_MAX:
141 		return (_SIGRTMAX - _SIGRTMIN + 1);
142 
143 	case _CONFIG_SEM_NSEMS_MAX:
144 		return (_SEM_NSEMS_MAX);
145 
146 	case _CONFIG_SEM_VALUE_MAX:
147 		return (_SEM_VALUE_MAX);
148 
149 	case _CONFIG_SIGQUEUE_MAX:
150 		/*
151 		 * Maximum number of outstanding queued signals.
152 		 */
153 		{
154 			rlim64_t sigqsz_max;
155 			mutex_enter(&curproc->p_lock);
156 			sigqsz_max = rctl_enforced_value(rc_process_sigqueue,
157 			    curproc->p_rctls, curproc);
158 			mutex_exit(&curproc->p_lock);
159 			return ((uint_t)sigqsz_max);
160 		}
161 
162 	case _CONFIG_SIGRT_MIN:
163 		return (_SIGRTMIN);
164 
165 	case _CONFIG_SIGRT_MAX:
166 		return (_SIGRTMAX);
167 
168 	case _CONFIG_TIMER_MAX:
169 		return (timer_max);
170 
171 	case _CONFIG_PHYS_PAGES:
172 		/*
173 		 * If the non-global zone has a phys. memory cap, use that.
174 		 * We always report the system-wide value for the global zone,
175 		 * even though rcapd can be used on the global zone too.
176 		 */
177 		if (!INGLOBALZONE(curproc) &&
178 		    curproc->p_zone->zone_phys_mcap != 0)
179 			return (MIN(btop(curproc->p_zone->zone_phys_mcap),
180 			    physinstalled));
181 
182 		return (physinstalled);
183 
184 	case _CONFIG_AVPHYS_PAGES:
185 		/*
186 		 * If the non-global zone has a phys. memory cap, use
187 		 * the phys. memory cap - zone's current rss.  We always
188 		 * report the system-wide value for the global zone, even
189 		 * though rcapd can be used on the global zone too.
190 		 */
191 		if (!INGLOBALZONE(curproc) &&
192 		    curproc->p_zone->zone_phys_mcap != 0) {
193 			pgcnt_t cap, rss, free;
194 			vmusage_t in_use;
195 			size_t cnt = 1;
196 
197 			cap = btop(curproc->p_zone->zone_phys_mcap);
198 			if (cap > physinstalled)
199 				return (freemem);
200 
201 			if (vm_getusage(VMUSAGE_ZONE, 1, &in_use, &cnt,
202 			    FKIOCTL) != 0)
203 				in_use.vmu_rss_all = 0;
204 			rss = btop(in_use.vmu_rss_all);
205 			/*
206 			 * Because rcapd implements a soft cap, it is possible
207 			 * for rss to be temporarily over the cap.
208 			 */
209 			if (cap > rss)
210 				free = cap - rss;
211 			else
212 				free = 0;
213 			return (MIN(free, freemem));
214 		}
215 
216 		return (freemem);
217 
218 	case _CONFIG_MAXPID:
219 		return (maxpid);
220 
221 	case _CONFIG_CPUID_MAX:
222 		return (max_cpuid);
223 
224 	case _CONFIG_EPHID_MAX:
225 		return (MAXEPHUID);
226 
227 	case _CONFIG_UADDR_MAX:
228 		return ((long)(uintptr_t)curproc->p_as->a_userlimit);
229 
230 	case _CONFIG_SYMLOOP_MAX:
231 		return (MAXSYMLINKS);
232 	}
233 }
234