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OS-11 rcapd behaves poorly when under extreme load
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--- old/usr/src/cmd/rcap/common/utils.c
+++ new/usr/src/cmd/rcap/common/utils.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
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14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 + * Copyright (c) 2011, Joyent, Inc. All rights reserved.
24 25 */
25 26
26 27 #include <sys/param.h>
27 28 #include <libintl.h>
28 29 #include <stdarg.h>
29 30 #include <stdio.h>
30 31 #include <stdlib.h>
31 32 #include <strings.h>
32 33 #include <syslog.h>
33 34 #include <unistd.h>
34 35 #include <errno.h>
35 36
36 37 #include "utils.h"
37 38
38 39 static char ERRNO_FMT[] = ": %s";
39 40
40 41 static char *pname = NULL;
41 42 static rcm_level_t message_priority = RCM_WARN;
42 43 static rcm_dst_t message_dst = RCD_STD;
43 44
44 45 static void dmesg(int level, char *msg);
45 46
46 47 /*PRINTFLIKE2*/
47 48 void
48 49 dprintfe(int level, char *format, ...)
49 50 {
50 51 va_list alist;
51 52
52 53 va_start(alist, format);
53 54 vdprintfe(level, format, alist);
54 55 va_end(alist);
55 56 }
56 57
57 58 /*PRINTFLIKE2*/
58 59 void
59 60 vdprintfe(int level, const char *format, va_list alist)
60 61 {
61 62 char buf[LINELEN];
62 63 char *c;
63 64 int err = errno;
64 65
65 66 *buf = 0;
66 67
67 68 if ((strlen(buf) + 1) < LINELEN)
68 69 (void) vsnprintf(buf + strlen(buf), LINELEN - 1 - strlen(buf),
69 70 format, alist);
70 71 if ((c = strchr(buf, '\n')) == NULL) {
71 72 if ((strlen(buf) + 1) < LINELEN)
72 73 (void) snprintf(buf + strlen(buf), LINELEN - 1 -
73 74 strlen(buf), gettext(ERRNO_FMT), strerror(err));
74 75 } else
75 76 *c = 0;
76 77
77 78 dmesg(level, buf);
78 79 }
79 80
80 81 #ifdef DEBUG_MSG
81 82 /*PRINTFLIKE1*/
82 83 void
83 84 debug(char *format, ...)
84 85 {
85 86 va_list alist;
86 87
87 88 if (get_message_priority() < RCM_DEBUG)
88 89 return;
89 90
90 91 va_start(alist, format);
91 92 vdprintfe(RCM_DEBUG, format, alist);
92 93 va_end(alist);
93 94 }
94 95
95 96 /*PRINTFLIKE1*/
96 97 void
97 98 debug_high(char *format, ...)
98 99 {
99 100 va_list alist;
100 101
101 102 if (get_message_priority() < RCM_DEBUG_HIGH)
102 103 return;
103 104
104 105 va_start(alist, format);
105 106 vdprintfe(RCM_DEBUG_HIGH, format, alist);
106 107 va_end(alist);
107 108 }
108 109 #endif /* DEBUG_MSG */
109 110
110 111 /*PRINTFLIKE1*/
111 112 void
112 113 warn(const char *format, ...)
113 114 {
114 115 va_list alist;
115 116
116 117 if (get_message_priority() < RCM_WARN)
117 118 return;
118 119
119 120 va_start(alist, format);
120 121 vdprintfe(RCM_WARN, format, alist);
121 122 va_end(alist);
122 123 }
123 124
124 125 /*PRINTFLIKE1*/
125 126 void
126 127 die(char *format, ...)
127 128 {
128 129 va_list alist;
129 130
130 131 if (get_message_priority() < RCM_ERR)
131 132 return;
132 133
133 134 va_start(alist, format);
134 135 vdprintfe(RCM_ERR, format, alist);
135 136 va_end(alist);
136 137
137 138 exit(E_ERROR);
138 139 }
139 140
140 141 /*PRINTFLIKE1*/
141 142 void
142 143 info(char *format, ...)
143 144 {
144 145 va_list alist;
145 146
146 147 if (get_message_priority() < RCM_INFO)
147 148 return;
148 149
149 150 va_start(alist, format);
150 151 vdprintfe(RCM_INFO, format, alist);
151 152 va_end(alist);
152 153 }
153 154
154 155 char *
155 156 setpname(char *arg0)
156 157 {
157 158 char *p = strrchr(arg0, '/');
158 159
159 160 if (p == NULL)
160 161 p = arg0;
161 162 else
162 163 p++;
163 164 pname = p;
164 165 return (pname);
165 166 }
166 167
167 168 /*
168 169 * Output a message to the controlling tty or log, depending on which is
169 170 * configured. The message should contain no newlines.
170 171 */
171 172 static void
172 173 dmesg(int level, char *msg)
173 174 {
174 175 if (message_priority >= level) {
175 176 FILE *fp;
176 177 int syslog_severity = -1;
177 178
178 179 switch (message_dst) {
179 180 case RCD_STD:
180 181 fp = level >= RCM_DEBUG ? stderr : stdout;
181 182
182 183 if (pname != NULL) {
183 184 (void) fputs(pname, fp);
184 185 (void) fputs(": ", fp);
185 186 }
186 187 (void) fputs(msg, fp);
187 188 (void) fputc('\n', fp);
188 189 (void) fflush(fp);
189 190 break;
190 191 case RCD_SYSLOG:
191 192 switch (level) {
192 193 case RCM_ERR:
193 194 syslog_severity = LOG_ERR;
194 195 break;
195 196 case RCM_WARN:
196 197 syslog_severity = LOG_WARNING;
197 198 break;
198 199 case RCM_INFO:
199 200 syslog_severity = LOG_INFO;
200 201 break;
201 202 case RCM_DEBUG:
202 203 syslog_severity = LOG_DEBUG;
203 204 break;
204 205 }
205 206 if (syslog_severity >= 0)
206 207 (void) syslog(syslog_severity, "%s", msg);
207 208 break;
208 209 }
209 210 }
210 211 }
211 212
212 213 rcm_level_t
213 214 get_message_priority(void)
214 215 {
215 216 return (message_priority);
216 217 }
217 218
218 219 rcm_level_t
219 220 set_message_priority(rcm_level_t new_priority)
220 221 {
221 222 rcm_level_t old_priority = message_priority;
222 223
223 224 message_priority = new_priority;
224 225 return (old_priority);
225 226 }
226 227
227 228 rcm_dst_t
228 229 set_message_destination(rcm_dst_t new_dst)
229 230 {
230 231 rcm_dst_t old_dst = message_dst;
231 232
232 233 if ((message_dst = new_dst) == RCD_SYSLOG)
233 234 openlog(pname, LOG_ODELAY | LOG_PID, LOG_DAEMON);
234 235
235 236 return (old_dst);
236 237 }
237 238
238 239 void
239 240 hrt2ts(hrtime_t hrt, timestruc_t *tsp)
240 241 {
241 242 tsp->tv_sec = hrt / NANOSEC;
242 243 tsp->tv_nsec = hrt % NANOSEC;
243 244 }
244 245
245 246 int
246 247 xatoi(char *p)
247 248 {
248 249 int i;
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249 250 char *q;
250 251
251 252 errno = 0;
252 253 i = (int)strtol(p, &q, 10);
253 254 if (errno != 0 || q == p || i < 0 || *q != '\0') {
254 255 warn(gettext("illegal argument -- %s\n"), p);
255 256 return (-1);
256 257 } else {
257 258 return (i);
258 259 }
259 -}
260 -
261 -/*
262 - * get_running_zones() calls zone_list(2) to find out how many zones are
263 - * running. It then calls zone_list(2) again to fetch the list of running
264 - * zones (stored in *zents).
265 - */
266 -int
267 -get_running_zones(uint_t *nzents, zone_entry_t **zents)
268 -{
269 - zoneid_t *zids;
270 - uint_t nzents_saved;
271 - int i;
272 - zone_entry_t *zentp;
273 - zone_state_t zstate;
274 -
275 - *zents = NULL;
276 - if (zone_list(NULL, nzents) != 0) {
277 - warn(gettext("could not get zoneid list\n"));
278 - return (E_ERROR);
279 - }
280 -
281 -again:
282 - if (*nzents == 0)
283 - return (E_SUCCESS);
284 -
285 - if ((zids = (zoneid_t *)calloc(*nzents, sizeof (zoneid_t))) == NULL) {
286 - warn(gettext("out of memory: zones will not be capped\n"));
287 - return (E_ERROR);
288 - }
289 -
290 - nzents_saved = *nzents;
291 -
292 - if (zone_list(zids, nzents) != 0) {
293 - warn(gettext("could not get zone list\n"));
294 - free(zids);
295 - return (E_ERROR);
296 - }
297 - if (*nzents != nzents_saved) {
298 - /* list changed, try again */
299 - free(zids);
300 - goto again;
301 - }
302 -
303 - *zents = calloc(*nzents, sizeof (zone_entry_t));
304 - if (*zents == NULL) {
305 - warn(gettext("out of memory: zones will not be capped\n"));
306 - free(zids);
307 - return (E_ERROR);
308 - }
309 -
310 - zentp = *zents;
311 - for (i = 0; i < *nzents; i++) {
312 - char name[ZONENAME_MAX];
313 -
314 - if (getzonenamebyid(zids[i], name, sizeof (name)) < 0) {
315 - warn(gettext("could not get name for "
316 - "zoneid %d\n"), zids[i]);
317 - continue;
318 - }
319 -
320 - (void) strlcpy(zentp->zname, name, sizeof (zentp->zname));
321 - zentp->zid = zids[i];
322 - if (zone_get_state(name, &zstate) != Z_OK ||
323 - zstate != ZONE_STATE_RUNNING)
324 - continue;
325 -
326 -
327 - zentp++;
328 - }
329 - *nzents = zentp - *zents;
330 -
331 - free(zids);
332 - return (E_SUCCESS);
333 260 }
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