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 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 #include	<stdio.h>
34 #include	<stdlib.h>
35 #include	<string.h>
36 #include	<unistd.h>
37 #include	<errno.h>
38 #include	<sys/types.h>
39 #include	<sys/priocntl.h>
40 #include	<sys/rtpriocntl.h>
41 #include	<sys/param.h>
42 #include	<sys/rt.h>
43 
44 #include	"dispadmin.h"
45 
46 /*
47  * This file contains the class specific code implementing
48  * the real-time dispadmin sub-command.
49  */
50 
51 #define	BASENMSZ	16
52 
53 extern char	*basename();
54 
55 static void	get_rtdptbl(), set_rtdptbl();
56 
57 static char usage[] = "usage:	dispadmin -l\n"
58 			    "dispadmin -c RT -g [-r res]\n"
59 			    "dispadmin -c RT -s infile\n";
60 
61 static char	basenm[BASENMSZ];
62 static char	cmdpath[256];
63 
64 
65 int
main(int argc,char ** argv)66 main(int argc, char **argv)
67 {
68 	extern char	*optarg;
69 
70 	int		c;
71 	int		lflag, gflag, rflag, sflag;
72 	ulong_t		res;
73 	char		*infile;
74 
75 	(void) strcpy(cmdpath, argv[0]);
76 	(void) strcpy(basenm, basename(argv[0]));
77 	lflag = gflag = rflag = sflag = 0;
78 	while ((c = getopt(argc, argv, "lc:gr:s:")) != -1) {
79 		switch (c) {
80 
81 		case 'l':
82 			lflag++;
83 			break;
84 
85 		case 'c':
86 			if (strcmp(optarg, "RT") != 0)
87 				fatalerr("error: %s executed for %s class, "
88 				    "%s is actually sub-command for RT class\n",
89 				    cmdpath, optarg, cmdpath);
90 			break;
91 
92 		case 'g':
93 			gflag++;
94 			break;
95 
96 		case 'r':
97 			rflag++;
98 			res = strtoul(optarg, (char **)NULL, 10);
99 			break;
100 
101 		case 's':
102 			sflag++;
103 			infile = optarg;
104 			break;
105 
106 		case '?':
107 			fatalerr(usage);
108 
109 		default:
110 			break;
111 		}
112 	}
113 
114 	if (lflag) {
115 		if (gflag || rflag || sflag)
116 			fatalerr(usage);
117 
118 		(void) printf("RT\t(Real Time)\n");
119 		return (0);
120 
121 	} else if (gflag) {
122 		if (lflag || sflag)
123 			fatalerr(usage);
124 
125 		if (rflag == 0)
126 			res = 1000;
127 
128 		get_rtdptbl(res);
129 		return (0);
130 
131 	} else if (sflag) {
132 		if (lflag || gflag || rflag)
133 			fatalerr(usage);
134 
135 		set_rtdptbl(infile);
136 		return (0);
137 
138 	} else {
139 		fatalerr(usage);
140 	}
141 	return (1);
142 }
143 
144 
145 /*
146  * Retrieve the current rt_dptbl from memory, convert the time quantum
147  * values to the resolution specified by res and write the table to stdout.
148  */
149 static void
get_rtdptbl(ulong_t res)150 get_rtdptbl(ulong_t res)
151 {
152 	int		i;
153 	int		rtdpsz;
154 	pcinfo_t	pcinfo;
155 	pcadmin_t	pcadmin;
156 	rtadmin_t	rtadmin;
157 	rtdpent_t	*rt_dptbl;
158 	hrtimer_t	hrtime;
159 
160 	(void) strcpy(pcinfo.pc_clname, "RT");
161 	if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
162 		fatalerr("%s: Can't get RT class ID, priocntl system call "
163 		    "failed with errno %d\n", basenm, errno);
164 
165 	pcadmin.pc_cid = pcinfo.pc_cid;
166 	pcadmin.pc_cladmin = (char *)&rtadmin;
167 	rtadmin.rt_cmd = RT_GETDPSIZE;
168 
169 	if (priocntl(0, 0, PC_ADMIN, (caddr_t)&pcadmin) == -1)
170 		fatalerr("%s: Can't get rt_dptbl size, priocntl system call "
171 		    "failed with errno %d\n", basenm, errno);
172 
173 	rtdpsz = rtadmin.rt_ndpents * sizeof (rtdpent_t);
174 	if ((rt_dptbl = (rtdpent_t *)malloc(rtdpsz)) == NULL)
175 		fatalerr("%s: Can't allocate memory for rt_dptbl\n", basenm);
176 
177 	rtadmin.rt_dpents = rt_dptbl;
178 
179 	rtadmin.rt_cmd = RT_GETDPTBL;
180 	if (priocntl(0, 0, PC_ADMIN, (caddr_t)&pcadmin) == -1)
181 		fatalerr("%s: Can't get rt_dptbl, priocntl system call "
182 		    "failed with errno %d\n", basenm, errno);
183 
184 	(void) printf("# Real Time Dispatcher Configuration\n");
185 	(void) printf("RES=%ld\n\n", res);
186 	(void) printf("# TIME QUANTUM                    PRIORITY\n");
187 	(void) printf("# (rt_quantum)                      LEVEL\n");
188 
189 	for (i = 0; i < rtadmin.rt_ndpents; i++) {
190 		if (res != HZ && rt_dptbl[i].rt_quantum != RT_TQINF) {
191 			hrtime.hrt_secs = 0;
192 			hrtime.hrt_rem = rt_dptbl[i].rt_quantum;
193 			hrtime.hrt_res = HZ;
194 			if (_hrtnewres(&hrtime, res, HRT_RNDUP) == -1)
195 				fatalerr("%s: Can't convert to requested "
196 				    "resolution\n", basenm);
197 			if ((rt_dptbl[i].rt_quantum =
198 			    hrtconvert(&hrtime)) == -1)
199 				fatalerr("%s: Can't express time quantum in "
200 				    "requested resolution,\n"
201 				    "try coarser resolution\n", basenm);
202 		}
203 		(void) printf("%10d                    #      %3d\n",
204 		    rt_dptbl[i].rt_quantum, i);
205 	}
206 }
207 
208 
209 /*
210  * Read the rt_dptbl values from infile, convert the time quantum values
211  * to HZ resolution, do a little sanity checking and overwrite the table
212  * in memory with the values from the file.
213  */
214 static void
set_rtdptbl(infile)215 set_rtdptbl(infile)
216 char	*infile;
217 {
218 	int		i;
219 	int		nrtdpents;
220 	char		*tokp;
221 	pcinfo_t	pcinfo;
222 	pcadmin_t	pcadmin;
223 	rtadmin_t	rtadmin;
224 	rtdpent_t	*rt_dptbl;
225 	int		linenum;
226 	ulong_t		res;
227 	hrtimer_t	hrtime;
228 	FILE		*fp;
229 	char		buf[512];
230 	int		wslength;
231 
232 	(void) strcpy(pcinfo.pc_clname, "RT");
233 	if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
234 		fatalerr("%s: Can't get RT class ID, priocntl system call "
235 		    "failed with errno %d\n", basenm, errno);
236 
237 	pcadmin.pc_cid = pcinfo.pc_cid;
238 	pcadmin.pc_cladmin = (char *)&rtadmin;
239 	rtadmin.rt_cmd = RT_GETDPSIZE;
240 
241 	if (priocntl(0, 0, PC_ADMIN, (caddr_t)&pcadmin) == -1)
242 		fatalerr("%s: Can't get rt_dptbl size, priocntl system call "
243 		    "failed with errno %d\n", basenm, errno);
244 
245 	nrtdpents = rtadmin.rt_ndpents;
246 	if ((rt_dptbl =
247 	    (rtdpent_t *)malloc(nrtdpents * sizeof (rtdpent_t))) == NULL)
248 		fatalerr("%s: Can't allocate memory for rt_dptbl\n", basenm);
249 
250 	if ((fp = fopen(infile, "r")) == NULL)
251 		fatalerr("%s: Can't open %s for input\n", basenm, infile);
252 
253 	linenum = 0;
254 
255 	/*
256 	 * Find the first non-blank, non-comment line.  A comment line
257 	 * is any line with '#' as the first non-white-space character.
258 	 */
259 	do {
260 		if (fgets(buf, sizeof (buf), fp) == NULL)
261 			fatalerr("%s: Too few lines in input table\n", basenm);
262 		linenum++;
263 	} while (buf[0] == '#' || buf[0] == '\0' ||
264 	    (wslength = strspn(buf, " \t\n")) == strlen(buf) ||
265 	    strchr(buf, '#') == buf + wslength);
266 
267 	if ((tokp = strtok(buf, " \t")) == NULL)
268 		fatalerr("%s: Bad RES specification, line %d of input file\n",
269 		    basenm, linenum);
270 	if ((int)strlen(tokp) > 4) {
271 		if (strncmp(tokp, "RES=", 4) != 0)
272 			fatalerr("%s: Bad RES specification, "
273 			    "line %d of input file\n", basenm, linenum);
274 		if (tokp[4] == '-')
275 			fatalerr("%s: Bad RES specification, "
276 			    "line %d of input file\n", basenm, linenum);
277 		res = strtoul(&tokp[4], (char **)NULL, 10);
278 	} else if (strlen(tokp) == 4) {
279 		if (strcmp(tokp, "RES=") != 0)
280 			fatalerr("%s: Bad RES specification, "
281 			    "line %d of input file\n", basenm, linenum);
282 		if ((tokp = strtok(NULL, " \t")) == NULL)
283 			fatalerr("%s: Bad RES specification, "
284 			    "line %d of input file\n", basenm, linenum);
285 		if (tokp[0] == '-')
286 			fatalerr("%s: Bad RES specification, "
287 			    "line %d of input file\n", basenm, linenum);
288 		res = strtoul(tokp, (char **)NULL, 10);
289 	} else if (strlen(tokp) == 3) {
290 		if (strcmp(tokp, "RES") != 0)
291 			fatalerr("%s: Bad RES specification, "
292 			    "line %d of input file\n", basenm, linenum);
293 		if ((tokp = strtok(NULL, " \t")) == NULL)
294 			fatalerr("%s: Bad RES specification, "
295 			    "line %d of input file\n", basenm, linenum);
296 		if ((int)strlen(tokp) > 1) {
297 			if (strncmp(tokp, "=", 1) != 0)
298 				fatalerr("%s: Bad RES specification, "
299 				    "line %d of input file\n", basenm, linenum);
300 			if (tokp[1] == '-')
301 				fatalerr("%s: Bad RES specification, "
302 				    "line %d of input file\n", basenm, linenum);
303 			res = strtoul(&tokp[1], (char **)NULL, 10);
304 		} else if (strlen(tokp) == 1) {
305 			if ((tokp = strtok(NULL, " \t")) == NULL)
306 				fatalerr("%s: Bad RES specification, "
307 				    "line %d of input file\n", basenm, linenum);
308 			if (tokp[0] == '-')
309 				fatalerr("%s: Bad RES specification, "
310 				    "line %d of input file\n", basenm, linenum);
311 			res = strtoul(tokp, (char **)NULL, 10);
312 		}
313 	} else {
314 		fatalerr("%s: Bad RES specification, line %d of input file\n",
315 		    basenm, linenum);
316 	}
317 
318 	/*
319 	 * The remainder of the input file should contain exactly enough
320 	 * non-blank, non-comment lines to fill the table (rt_ndpents lines).
321 	 * We assume that any non-blank, non-comment line is data for the
322 	 * table and fail if we find more or less than we need.
323 	 */
324 	for (i = 0; i < rtadmin.rt_ndpents; i++) {
325 
326 		/*
327 		 * Get the next non-blank, non-comment line.
328 		 */
329 		do {
330 			if (fgets(buf, sizeof (buf), fp) == NULL)
331 				fatalerr("%s: Too few lines in input table\n",
332 				    basenm);
333 			linenum++;
334 		} while (buf[0] == '#' || buf[0] == '\0' ||
335 		    (wslength = strspn(buf, " \t\n")) == strlen(buf) ||
336 		    strchr(buf, '#') == buf + wslength);
337 
338 		if ((tokp = strtok(buf, " \t")) == NULL)
339 			fatalerr("%s: Too few values, line %d of input file\n",
340 			    basenm, linenum);
341 
342 		rt_dptbl[i].rt_quantum = atol(tokp);
343 		if (rt_dptbl[i].rt_quantum <= 0) {
344 			if (rt_dptbl[i].rt_quantum != RT_TQINF)
345 				fatalerr("%s: rt_quantum value out of "
346 				    "valid range; line %d of input,\n"
347 				    "table not overwritten\n", basenm, linenum);
348 		} else if (res != HZ) {
349 			hrtime.hrt_secs = 0;
350 			hrtime.hrt_rem = rt_dptbl[i].rt_quantum;
351 			hrtime.hrt_res = res;
352 			if (_hrtnewres(&hrtime, HZ, HRT_RNDUP) == -1)
353 				fatalerr("%s: Can't convert specified "
354 				    "resolution to ticks\n", basenm);
355 			if ((rt_dptbl[i].rt_quantum =
356 			    hrtconvert(&hrtime)) == -1)
357 				fatalerr("%s: rt_quantum value out of "
358 				    "valid range; line %d of input,\n"
359 				    "table not overwritten\n", basenm, linenum);
360 		}
361 
362 		if ((tokp = strtok(NULL, " \t")) != NULL && tokp[0] != '#')
363 			fatalerr("%s: Too many values, line %d of input file\n",
364 			    basenm, linenum);
365 	}
366 
367 	/*
368 	 * We've read enough lines to fill the table.  We fail
369 	 * if the input file contains any more.
370 	 */
371 	while (fgets(buf, sizeof (buf), fp) != NULL) {
372 		if (buf[0] != '#' && buf[0] != '\0' &&
373 		    (wslength = strspn(buf, " \t\n")) != strlen(buf) &&
374 		    strchr(buf, '#') != buf + wslength)
375 			fatalerr("%s: Too many lines in input table\n",
376 				basenm);
377 	}
378 
379 	rtadmin.rt_dpents = rt_dptbl;
380 	rtadmin.rt_cmd = RT_SETDPTBL;
381 	if (priocntl(0, 0, PC_ADMIN, (caddr_t)&pcadmin) == -1)
382 		fatalerr("%s: Can't set rt_dptbl, priocntl system call failed "
383 		    "with errno %d\n", basenm, errno);
384 }
385