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1.1 ! root 1: static char *sccsid = "@(#)w.c 4.1 (Berkeley) 10/1/80"; ! 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: }
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