Commit | Line | Data |
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76238d88 BJ |
1 | static char *sccsid = "@(#)w.c 4.1 (Berkeley) %G%"; |
2 | /* | |
3 | * w - print system status (who and what) | |
4 | * | |
5 | * This program is similar to the systat command on Tenex/Tops 10/20 | |
6 | * It needs read permission on /dev/mem, /dev/kmem, and /dev/drum. | |
7 | */ | |
8 | #include <sys/param.h> | |
9 | #include <nlist.h> | |
10 | #include <stdio.h> | |
11 | #include <ctype.h> | |
12 | #include <utmp.h> | |
13 | #include <time.h> | |
14 | #include <sys/stat.h> | |
15 | #include <sys/dir.h> | |
16 | #include <sys/user.h> | |
17 | #include <sys/proc.h> | |
18 | #include <sys/pte.h> | |
19 | #include <sys/vm.h> | |
20 | ||
21 | #define NMAX sizeof(utmp.ut_name) | |
22 | #define LMAX sizeof(utmp.ut_line) | |
23 | ||
24 | #define ARGWIDTH 33 /* # chars left on 80 col crt for args */ | |
25 | ||
26 | struct smproc { | |
27 | short w_pid; /* proc.p_pid */ | |
28 | char w_flag; /* proc.p_flag */ | |
29 | short w_size; /* proc.p_size */ | |
30 | long w_seekaddr; /* where to find args */ | |
31 | long w_lastpg; /* disk address of stack */ | |
32 | int w_igintr; /* INTR+3*QUIT, 0=die, 1=ign, 2=catch */ | |
33 | time_t w_time; /* CPU time used by this process */ | |
34 | time_t w_ctime; /* CPU time used by children */ | |
35 | dev_t w_tty; /* tty device of process */ | |
36 | char w_comm[15]; /* user.u_comm, null terminated */ | |
37 | char w_args[ARGWIDTH+1]; /* args if interesting process */ | |
38 | } pr[NPROC]; | |
39 | ||
40 | struct nlist nl[] = { | |
41 | { "_proc" }, | |
42 | #define X_PROC 0 | |
43 | { "_swapdev" }, | |
44 | #define X_SWAPDEV 1 | |
45 | { "_Usrptmap" }, | |
46 | #define X_USRPTMA 2 | |
47 | { "_usrpt" }, | |
48 | #define X_USRPT 3 | |
49 | { "_nswap" }, | |
50 | #define X_NSWAP 4 | |
51 | { "_avenrun" }, | |
52 | #define X_AVENRUN 5 | |
53 | { "_bootime" }, | |
54 | #define X_BOOTIME 6 | |
55 | { 0 }, | |
56 | }; | |
57 | ||
58 | FILE *ps; | |
59 | FILE *ut; | |
60 | FILE *bootfd; | |
61 | int kmem; | |
62 | int mem; | |
63 | int swap; /* /dev/kmem, mem, and swap */ | |
64 | int nswap; | |
65 | dev_t tty; | |
66 | char doing[520]; /* process attached to terminal */ | |
67 | time_t proctime; /* cpu time of process in doing */ | |
68 | double avenrun[3]; | |
69 | ||
70 | #define DIV60(t) ((t+30)/60) /* x/60 rounded */ | |
71 | #define TTYEQ (tty == pr[i].w_tty) | |
72 | #define IGINT (1+3*1) /* ignoring both SIGINT & SIGQUIT */ | |
73 | ||
74 | char *getargs(); | |
75 | char *fread(); | |
76 | char *ctime(); | |
77 | char *rindex(); | |
78 | FILE *popen(); | |
79 | struct tm *localtime(); | |
80 | ||
81 | int debug; /* true if -d flag: debugging output */ | |
82 | int header = 1; /* true if -h flag: don't print heading */ | |
83 | int lflag = 1; /* true if -l flag: long style output */ | |
84 | int login; /* true if invoked as login shell */ | |
85 | int idle; /* number of minutes user is idle */ | |
86 | int nusers; /* number of users logged in now */ | |
87 | char * sel_user; /* login of particular user selected */ | |
88 | char firstchar; /* first char of name of prog invoked as */ | |
89 | time_t jobtime; /* total cpu time visible */ | |
90 | time_t now; /* the current time of day */ | |
91 | struct tm *nowt; /* current time as time struct */ | |
92 | time_t bootime, uptime; /* time of last reboot & elapsed time since */ | |
93 | int np; /* number of processes currently active */ | |
94 | struct utmp utmp; | |
95 | struct proc mproc; | |
96 | struct user up; | |
97 | char fill[512]; | |
98 | ||
99 | main(argc, argv) | |
100 | char **argv; | |
101 | { | |
102 | int days, hrs, mins; | |
103 | register int i, j; | |
104 | char *cp; | |
105 | register int curpid, empty; | |
106 | char obuf[BUFSIZ]; | |
107 | ||
108 | setbuf(stdout, obuf); | |
109 | login = (argv[0][0] == '-'); | |
110 | cp = rindex(argv[0], '/'); | |
111 | firstchar = login ? argv[0][1] : (cp==0) ? argv[0][0] : cp[1]; | |
112 | cp = argv[0]; /* for Usage */ | |
113 | ||
114 | while (argc > 1) { | |
115 | if (argv[1][0] == '-') { | |
116 | for (i=1; argv[1][i]; i++) { | |
117 | switch(argv[1][i]) { | |
118 | ||
119 | case 'd': | |
120 | debug++; | |
121 | break; | |
122 | ||
123 | case 'h': | |
124 | header = 0; | |
125 | break; | |
126 | ||
127 | case 'l': | |
128 | lflag++; | |
129 | break; | |
130 | ||
131 | case 's': | |
132 | lflag = 0; | |
133 | break; | |
134 | ||
135 | case 'u': | |
136 | case 'w': | |
137 | firstchar = argv[1][1]; | |
138 | break; | |
139 | ||
140 | default: | |
141 | printf("Bad flag %s\n", argv[1]); | |
142 | exit(1); | |
143 | } | |
144 | } | |
145 | } else { | |
146 | if (!isalnum(argv[1][0]) || argc > 2) { | |
147 | printf("Usage: %s [ -hlsuw ] [ user ]\n", cp); | |
148 | exit(1); | |
149 | } else | |
150 | sel_user = argv[1]; | |
151 | } | |
152 | argc--; argv++; | |
153 | } | |
154 | ||
155 | if ((kmem = open("/dev/kmem", 0)) < 0) { | |
156 | fprintf(stderr, "No kmem\n"); | |
157 | exit(1); | |
158 | } | |
159 | nlist("/vmunix", nl); | |
160 | if (nl[0].n_type==0) { | |
161 | fprintf(stderr, "No namelist\n"); | |
162 | exit(1); | |
163 | } | |
164 | ||
165 | if (firstchar != 'u') | |
166 | readpr(); | |
167 | ||
168 | ut = fopen("/etc/utmp","r"); | |
169 | if (header) { | |
170 | /* Print time of day */ | |
171 | time(&now); | |
172 | nowt = localtime(&now); | |
173 | prtat(nowt); | |
174 | ||
175 | /* | |
176 | * Print how long system has been up. | |
177 | * (Found by looking for "bootime" in kernel) | |
178 | */ | |
179 | lseek(kmem, (long)nl[X_BOOTIME].n_value, 0); | |
180 | read(kmem, &bootime, sizeof (bootime)); | |
181 | ||
182 | uptime = now - bootime; | |
183 | days = uptime / (60*60*24); | |
184 | uptime %= (60*60*24); | |
185 | hrs = uptime / (60*60); | |
186 | uptime %= (60*60); | |
187 | mins = DIV60(uptime); | |
188 | ||
189 | printf(" up"); | |
190 | if (days > 0) | |
191 | printf(" %d day%s,", days, days>1?"s":""); | |
192 | if (hrs > 0 && mins > 0) { | |
193 | printf(" %2d:%02d,", hrs, mins); | |
194 | } else { | |
195 | if (hrs > 0) | |
196 | printf(" %d hr%s,", hrs, hrs>1?"s":""); | |
197 | if (mins > 0) | |
198 | printf(" %d min%s,", mins, mins>1?"s":""); | |
199 | } | |
200 | ||
201 | /* Print number of users logged in to system */ | |
202 | while (fread(&utmp, sizeof(utmp), 1, ut)) { | |
203 | if (utmp.ut_name[0] != '\0') | |
204 | nusers++; | |
205 | } | |
206 | rewind(ut); | |
207 | printf(" %d users", nusers); | |
208 | ||
209 | /* | |
210 | * Print 1, 5, and 15 minute load averages. | |
211 | * (Found by looking in kernel for avenrun). | |
212 | */ | |
213 | printf(", load average:"); | |
214 | lseek(kmem, (long)nl[X_AVENRUN].n_value, 0); | |
215 | read(kmem, avenrun, sizeof(avenrun)); | |
216 | for (i = 0; i < (sizeof(avenrun)/sizeof(avenrun[0])); i++) { | |
217 | if (i > 0) | |
218 | printf(","); | |
219 | printf(" %.2f", avenrun[i]); | |
220 | } | |
221 | printf("\n"); | |
222 | if (firstchar == 'u') | |
223 | exit(0); | |
224 | ||
225 | /* Headers for rest of output */ | |
226 | if (lflag) | |
227 | printf("User tty login@ idle JCPU PCPU what\n"); | |
228 | else | |
229 | printf("User tty idle what\n"); | |
230 | fflush(stdout); | |
231 | } | |
232 | ||
233 | ||
234 | for (;;) { /* for each entry in utmp */ | |
235 | if (fread(&utmp, sizeof(utmp), 1, ut) == NULL) { | |
236 | fclose(ut); | |
237 | exit(0); | |
238 | } | |
239 | if (utmp.ut_name[0] == '\0') | |
240 | continue; /* that tty is free */ | |
241 | if (sel_user && strcmpn(utmp.ut_name, sel_user, NMAX) != 0) | |
242 | continue; /* we wanted only somebody else */ | |
243 | ||
244 | gettty(); | |
245 | jobtime = 0; | |
246 | proctime = 0; | |
247 | strcpy(doing, "-"); /* default act: normally never prints */ | |
248 | empty = 1; | |
249 | curpid = -1; | |
250 | idle = findidle(); | |
251 | for (i=0; i<np; i++) { /* for each process on this tty */ | |
252 | if (!(TTYEQ)) | |
253 | continue; | |
254 | jobtime += pr[i].w_time + pr[i].w_ctime; | |
255 | proctime += pr[i].w_time; | |
256 | if (debug) { | |
257 | printf("\t\t%d\t%s", pr[i].w_pid, pr[i].w_args); | |
258 | if ((j=pr[i].w_igintr) > 0) | |
259 | if (j==IGINT) | |
260 | printf(" &"); | |
261 | else | |
262 | printf(" & %d %d", j%3, j/3); | |
263 | printf("\n"); | |
264 | } | |
265 | if (empty && pr[i].w_igintr!=IGINT) { | |
266 | empty = 0; | |
267 | curpid = -1; | |
268 | } | |
269 | if(pr[i].w_pid>curpid && (pr[i].w_igintr!=IGINT || empty)){ | |
270 | curpid = pr[i].w_pid; | |
271 | strcpy(doing, lflag ? pr[i].w_args : pr[i].w_comm); | |
272 | #ifdef notdef | |
273 | if (doing[0]==0 || doing[0]=='-' && doing[1]<=' ' || doing[0] == '?') { | |
274 | strcat(doing, " ("); | |
275 | strcat(doing, pr[i].w_comm); | |
276 | strcat(doing, ")"); | |
277 | } | |
278 | #endif | |
279 | } | |
280 | } | |
281 | putline(); | |
282 | } | |
283 | } | |
284 | ||
285 | /* figure out the major/minor device # pair for this tty */ | |
286 | gettty() | |
287 | { | |
288 | char ttybuf[20]; | |
289 | struct stat statbuf; | |
290 | ||
291 | ttybuf[0] = 0; | |
292 | strcpy(ttybuf, "/dev/"); | |
293 | strcat(ttybuf, utmp.ut_line); | |
294 | stat(ttybuf, &statbuf); | |
295 | tty = statbuf.st_rdev; | |
296 | } | |
297 | ||
298 | /* | |
299 | * putline: print out the accumulated line of info about one user. | |
300 | */ | |
301 | putline() | |
302 | { | |
303 | register int tm; | |
304 | ||
305 | /* print login name of the user */ | |
306 | printf("%-*.*s ", NMAX, NMAX, utmp.ut_name); | |
307 | ||
308 | /* print tty user is on */ | |
309 | if (lflag) | |
310 | /* long form: all (up to) LMAX chars */ | |
311 | printf("%-*.*s", LMAX, LMAX, utmp.ut_line); | |
312 | else { | |
313 | /* short form: 2 chars, skipping 'tty' if there */ | |
314 | if (utmp.ut_line[0]=='t' && utmp.ut_line[1]=='t' && utmp.ut_line[2]=='y') | |
315 | printf("%-2.2s", &utmp.ut_line[3]); | |
316 | else | |
317 | printf("%-2.2s", utmp.ut_line); | |
318 | } | |
319 | ||
320 | if (lflag) | |
321 | /* print when the user logged in */ | |
322 | prtat(localtime(&utmp.ut_time)); | |
323 | ||
324 | /* print idle time */ | |
325 | prttime(idle," "); | |
326 | ||
327 | if (lflag) { | |
328 | /* print CPU time for all processes & children */ | |
329 | prttime(DIV60(jobtime)," "); | |
330 | /* print cpu time for interesting process */ | |
331 | prttime(DIV60(proctime)," "); | |
332 | } | |
333 | ||
334 | /* what user is doing, either command tail or args */ | |
335 | printf(" %-.32s\n",doing); | |
336 | fflush(stdout); | |
337 | } | |
338 | ||
339 | /* find & return number of minutes current tty has been idle */ | |
340 | findidle() | |
341 | { | |
342 | struct stat stbuf; | |
343 | long lastaction, diff; | |
344 | char ttyname[20]; | |
345 | ||
346 | strcpy(ttyname, "/dev/"); | |
347 | strcatn(ttyname, utmp.ut_line, LMAX); | |
348 | stat(ttyname, &stbuf); | |
349 | time(&now); | |
350 | lastaction = stbuf.st_atime; | |
351 | diff = now - lastaction; | |
352 | diff = DIV60(diff); | |
353 | if (diff < 0) diff = 0; | |
354 | return(diff); | |
355 | } | |
356 | ||
357 | /* | |
358 | * prttime prints a time in hours and minutes. | |
359 | * The character string tail is printed at the end, obvious | |
360 | * strings to pass are "", " ", or "am". | |
361 | */ | |
362 | prttime(tim, tail) | |
363 | time_t tim; | |
364 | char *tail; | |
365 | { | |
366 | register int didhrs = 0; | |
367 | ||
368 | if (tim >= 60) { | |
369 | printf("%3d:", tim/60); | |
370 | didhrs++; | |
371 | } else { | |
372 | printf(" "); | |
373 | } | |
374 | tim %= 60; | |
375 | if (tim > 0 || didhrs) { | |
376 | printf(didhrs&&tim<10 ? "%02d" : "%2d", tim); | |
377 | } else { | |
378 | printf(" "); | |
379 | } | |
380 | printf("%s", tail); | |
381 | } | |
382 | ||
383 | /* prtat prints a 12 hour time given a pointer to a time of day */ | |
384 | prtat(p) | |
385 | struct tm *p; | |
386 | { | |
387 | register int t, pm; | |
388 | ||
389 | t = p -> tm_hour; | |
390 | pm = (t > 11); | |
391 | if (t > 11) | |
392 | t -= 12; | |
393 | if (t == 0) | |
394 | t = 12; | |
395 | prttime(t*60 + p->tm_min, pm ? "pm" : "am"); | |
396 | } | |
397 | ||
398 | /* | |
399 | * readpr finds and reads in the array pr, containing the interesting | |
400 | * parts of the proc and user tables for each live process. | |
401 | */ | |
402 | readpr() | |
403 | { | |
404 | int pn, mf, addr, c; | |
405 | int szpt, pfnum, i; | |
406 | struct pte *Usrptma, *usrpt, *pte, apte; | |
407 | struct dblock db; | |
408 | ||
409 | Usrptma = (struct pte *) nl[X_USRPTMA].n_value; | |
410 | usrpt = (struct pte *) nl[X_USRPT].n_value; | |
411 | if((mem = open("/dev/mem", 0)) < 0) { | |
412 | fprintf(stderr, "No mem\n"); | |
413 | exit(1); | |
414 | } | |
415 | if ((swap = open("/dev/drum", 0)) < 0) { | |
416 | fprintf(stderr, "No drum\n"); | |
417 | exit(1); | |
418 | } | |
419 | /* | |
420 | * read mem to find swap dev. | |
421 | */ | |
422 | lseek(kmem, (long)nl[X_SWAPDEV].n_value, 0); | |
423 | read(kmem, &nl[X_SWAPDEV].n_value, sizeof(nl[X_SWAPDEV].n_value)); | |
424 | /* | |
425 | * Find base of swap | |
426 | */ | |
427 | lseek(kmem, (long)nl[X_NSWAP].n_value, 0); | |
428 | read(kmem, &nswap, sizeof(nswap)); | |
429 | /* | |
430 | * Locate proc table | |
431 | */ | |
432 | np = 0; | |
433 | for (pn=0; pn<NPROC; pn++) { | |
434 | lseek(kmem, (long)(nl[X_PROC].n_value + pn*(sizeof mproc)), 0); | |
435 | read(kmem, &mproc, sizeof mproc); | |
436 | /* decide if it's an interesting process */ | |
437 | if (mproc.p_stat==0 || mproc.p_pgrp==0) | |
438 | continue; | |
439 | if (mproc.p_flag&SDETACH) | |
440 | continue; | |
441 | ||
442 | #ifdef notdef | |
443 | /* | |
444 | * The following speeds up w on systems with lots of ttys | |
445 | * by ignoring inits and gettys, but loses on root login shells. | |
446 | * On Ernie it reduced user and system time by .3 seconds, | |
447 | * an insignificant amount. It is commented out since it | |
448 | * will lose when root logs in. | |
449 | */ | |
450 | if (mproc.p_uid == 0 & mproc.p_ppid == 1) | |
451 | continue; | |
452 | #endif | |
453 | ||
454 | /* find & read in the user structure */ | |
455 | if ((mproc.p_flag & SLOAD) == 0) { | |
456 | /* not in memory - get from swap device */ | |
457 | addr = mproc.p_swaddr<<9; | |
458 | lseek(swap, (long)addr, 0); | |
459 | if (read(swap, &up, sizeof(up)) != sizeof(up)) { | |
460 | continue; | |
461 | } | |
462 | } else { | |
463 | int p0br, cc; | |
464 | #define INTPPG (NBPG / sizeof (int)) | |
465 | struct pte pagetbl[NBPG / sizeof (struct pte)]; | |
466 | /* loaded, get each page from memory separately */ | |
467 | szpt = mproc.p_szpt; | |
468 | p0br = (int)mproc.p_p0br; | |
469 | pte = &Usrptma[btokmx(mproc.p_p0br) + szpt-1]; | |
470 | lseek(kmem, (long)pte, 0); | |
471 | if (read(kmem, &apte, sizeof(apte)) != sizeof(apte)) | |
472 | continue; | |
473 | lseek(mem, ctob(apte.pg_pfnum), 0); | |
474 | if (read(mem,pagetbl,sizeof(pagetbl)) != sizeof(pagetbl)) | |
475 | cont: | |
476 | continue; | |
477 | for(cc=0; cc<UPAGES; cc++) { /* get u area */ | |
478 | int upage = pagetbl[NPTEPG-UPAGES+cc].pg_pfnum; | |
479 | lseek(mem,ctob(upage),0); | |
480 | if (read(mem,((int *)&up)+INTPPG*cc,NBPG) != NBPG) | |
481 | goto cont; | |
482 | } | |
483 | szpt = up.u_pcb.pcb_szpt; | |
484 | pr[np].w_seekaddr = ctob(apte.pg_pfnum); | |
485 | } | |
486 | vstodb(0, 1, &up.u_smap, &db, 1); | |
487 | pr[np].w_lastpg = ctob(db.db_base); | |
488 | if (up.u_ttyp == NULL) | |
489 | continue; | |
490 | ||
491 | /* save the interesting parts */ | |
492 | pr[np].w_pid = mproc.p_pid; | |
493 | pr[np].w_flag = mproc.p_flag; | |
494 | pr[np].w_size = mproc.p_dsize + mproc.p_ssize; | |
495 | pr[np].w_igintr = (((int)up.u_signal[2]==1) + 2*((int)up.u_signal[2]>1) + 3*((int)up.u_signal[3]==1)) + 6*((int)up.u_signal[3]>1); | |
496 | pr[np].w_time = up.u_vm.vm_utime + up.u_vm.vm_stime; | |
497 | pr[np].w_ctime = up.u_cvm.vm_utime + up.u_cvm.vm_stime; | |
498 | pr[np].w_tty = up.u_ttyd; | |
499 | up.u_comm[14] = 0; /* Bug: This bombs next field. */ | |
500 | strcpy(pr[np].w_comm, up.u_comm); | |
501 | /* | |
502 | * Get args if there's a chance we'll print it. | |
503 | * Cant just save pointer: getargs returns static place. | |
504 | * Cant use strcpyn: that crock blank pads. | |
505 | */ | |
506 | pr[np].w_args[0] = 0; | |
507 | strcatn(pr[np].w_args,getargs(&pr[np]),ARGWIDTH); | |
508 | if (pr[np].w_args[0]==0 || pr[np].w_args[0]=='-' && pr[np].w_args[1]<=' ' || pr[np].w_args[0] == '?') { | |
509 | strcat(pr[np].w_args, " ("); | |
510 | strcat(pr[np].w_args, pr[np].w_comm); | |
511 | strcat(pr[np].w_args, ")"); | |
512 | } | |
513 | np++; | |
514 | } | |
515 | } | |
516 | ||
517 | /* | |
518 | * getargs: given a pointer to a proc structure, this looks at the swap area | |
519 | * and tries to reconstruct the arguments. This is straight out of ps. | |
520 | */ | |
521 | char * | |
522 | getargs(p) | |
523 | struct smproc *p; | |
524 | { | |
525 | int c, addr, nbad; | |
526 | static int abuf[512/sizeof(int)]; | |
527 | struct pte pagetbl[NPTEPG]; | |
528 | register int *ip; | |
529 | register char *cp, *cp1; | |
530 | ||
531 | if ((p->w_flag & SLOAD) == 0) { | |
532 | lseek(swap, p->w_lastpg, 0); | |
533 | if (read(swap, abuf, sizeof(abuf)) != sizeof(abuf)) | |
534 | return(p->w_comm); | |
535 | } else { | |
536 | c = p->w_seekaddr; | |
537 | lseek(mem,c,0); | |
538 | if (read(mem,pagetbl,NBPG) != NBPG) | |
539 | return(p->w_comm); | |
540 | if (pagetbl[NPTEPG-1-UPAGES].pg_fod==0 && pagetbl[NPTEPG-1-UPAGES].pg_pfnum) { | |
541 | lseek(mem,ctob(pagetbl[NPTEPG-1-UPAGES].pg_pfnum),0); | |
542 | if (read(mem,abuf,sizeof(abuf)) != sizeof(abuf)) | |
543 | return(p->w_comm); | |
544 | } else { | |
545 | lseek(swap, p->w_lastpg, 0); | |
546 | if (read(swap, abuf, sizeof(abuf)) != sizeof(abuf)) | |
547 | return(p->w_comm); | |
548 | } | |
549 | } | |
550 | abuf[127] = 0; | |
551 | for (ip = &abuf[126]; ip > abuf;) { | |
552 | /* Look from top for -1 or 0 as terminator flag. */ | |
553 | if (*--ip == -1 || *ip == 0) { | |
554 | cp = (char *)(ip+1); | |
555 | if (*cp==0) | |
556 | cp++; | |
557 | nbad = 0; /* up to 5 funny chars as ?'s */ | |
558 | for (cp1 = cp; cp1 < (char *)&abuf[128]; cp1++) { | |
559 | c = *cp1&0177; | |
560 | if (c==0) /* nulls between args => spaces */ | |
561 | *cp1 = ' '; | |
562 | else if (c < ' ' || c > 0176) { | |
563 | if (++nbad >= 5) { | |
564 | *cp1++ = ' '; | |
565 | break; | |
566 | } | |
567 | *cp1 = '?'; | |
568 | } else if (c=='=') { /* Oops - found an | |
569 | * environment var, back | |
570 | * over & erase it. */ | |
571 | *cp1 = 0; | |
572 | while (cp1>cp && *--cp1!=' ') | |
573 | *cp1 = 0; | |
574 | break; | |
575 | } | |
576 | } | |
577 | while (*--cp1==' ') /* strip trailing spaces */ | |
578 | *cp1 = 0; | |
579 | return(cp); | |
580 | } | |
581 | } | |
582 | return (p->w_comm); | |
583 | } | |
584 | ||
585 | /* | |
586 | * Given a base/size pair in virtual swap area, | |
587 | * return a physical base/size pair which is the | |
588 | * (largest) initial, physically contiguous block. | |
589 | */ | |
590 | vstodb(vsbase, vssize, dmp, dbp, rev) | |
591 | register int vsbase; | |
592 | int vssize; | |
593 | struct dmap *dmp; | |
594 | register struct dblock *dbp; | |
595 | { | |
596 | register int blk = DMMIN; | |
597 | register swblk_t *ip = dmp->dm_map; | |
598 | ||
599 | if (vsbase < 0 || vsbase + vssize > dmp->dm_size) | |
600 | panic("vstodb"); | |
601 | while (vsbase >= blk) { | |
602 | vsbase -= blk; | |
603 | if (blk < DMMAX) | |
604 | blk *= 2; | |
605 | ip++; | |
606 | } | |
607 | if (*ip <= 0 || *ip + blk > nswap) | |
608 | panic("vstodb *ip"); | |
609 | dbp->db_size = min(vssize, blk - vsbase); | |
610 | dbp->db_base = *ip + (rev ? blk - (vsbase + dbp->db_size) : vsbase); | |
611 | } | |
612 | ||
613 | panic(cp) | |
614 | char *cp; | |
615 | { | |
616 | ||
617 | /* printf("%s\n", cp); */ | |
618 | } | |
619 | ||
620 | min(a, b) | |
621 | { | |
622 | ||
623 | return (a < b ? a : b); | |
624 | } |