usr.bin/ipcs/ipcs.c

   1 /*
   2  * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  19  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <assert.h>
  32 #include <err.h>
  33 #include <fcntl.h>
  34 #include <grp.h>
  35 #include <kvm.h>
  36 #include <nlist.h>
  37 #include <limits.h>
  38 #include <paths.h>
  39 #include <pwd.h>
  40 #include <stddef.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include <sys/types.h>
  47 #include <sys/param.h>
  48 #include <sys/time.h>
  49 #include <sys/proc.h>
  50 #include <sys/sysctl.h>
  51 #define _KERNEL
  52 #include <sys/ipc.h>
  53 #include <sys/sem.h>
  54 #include <sys/shm.h>
  55 #include <sys/msg.h>
  56
  57 /* SysCtlGatherStruct structure. */
  58 struct scgs_vector {
  59         const char *sysctl;
  60         off_t offset;
  61         size_t size;
  62 };
  63
  64 int     use_sysctl = 1;
  65 struct semid_kernel     *sema;
  66 struct seminfo  seminfo;
  67 struct msginfo  msginfo;
  68 struct msqid_kernel     *msqids;
  69 struct shminfo  shminfo;
  70 struct shmid_kernel     *shmsegs;
  71
  72 char   *fmt_perm(u_short);
  73 void    cvt_time(time_t, char *);
  74 void    sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vec);
  75 void    kget(int idx, void *addr, size_t size);
  76 void    usage(void);
  77 uid_t   user2uid(char *username);
  78
  79 static struct nlist symbols[] = {
  80         {"sema"},
  81 #define X_SEMA          0
  82         {"seminfo"},
  83 #define X_SEMINFO       1
  84         {"msginfo"},
  85 #define X_MSGINFO       2
  86         {"msqids"},
  87 #define X_MSQIDS        3
  88         {"shminfo"},
  89 #define X_SHMINFO       4
  90         {"shmsegs"},
  91 #define X_SHMSEGS       5
  92         {NULL}
  93 };
  94
  95 #define SHMINFO_XVEC                            \
  96 X(shmmax, sizeof(u_long))                               \
  97 X(shmmin, sizeof(u_long))                               \
  98 X(shmmni, sizeof(u_long))                               \
  99 X(shmseg, sizeof(u_long))                               \
 100 X(shmall, sizeof(u_long))
 101
 102 #define SEMINFO_XVEC                            \
 103 X(semmap, sizeof(int))                          \
 104 X(semmni, sizeof(int))                          \
 105 X(semmns, sizeof(int))                          \
 106 X(semmnu, sizeof(int))                          \
 107 X(semmsl, sizeof(int))                          \
 108 X(semopm, sizeof(int))                          \
 109 X(semume, sizeof(int))                          \
 110 X(semusz, sizeof(int))                          \
 111 X(semvmx, sizeof(int))                          \
 112 X(semaem, sizeof(int))
 113
 114 #define MSGINFO_XVEC                            \
 115 X(msgmax, sizeof(int))                          \
 116 X(msgmni, sizeof(int))                          \
 117 X(msgmnb, sizeof(int))                          \
 118 X(msgtql, sizeof(int))                          \
 119 X(msgssz, sizeof(int))                          \
 120 X(msgseg, sizeof(int))
 121
 122 #define X(a, b) { "kern.ipc." #a, offsetof(TYPEC, a), (b) },
 123 #define TYPEC   struct shminfo
 124 struct scgs_vector shminfo_scgsv[] = { SHMINFO_XVEC { NULL } };
 125 #undef  TYPEC
 126 #define TYPEC   struct seminfo
 127 struct scgs_vector seminfo_scgsv[] = { SEMINFO_XVEC { NULL } };
 128 #undef  TYPEC
 129 #define TYPEC   struct msginfo
 130 struct scgs_vector msginfo_scgsv[] = { MSGINFO_XVEC { NULL } };
 131 #undef  TYPEC
 132 #undef  X
 133
 134 static kvm_t *kd;
 135
 136 char   *
 137 fmt_perm(u_short mode)
 138 {
 139         static char buffer[100];
 140
 141         buffer[0] = '-';
 142         buffer[1] = '-';
 143         buffer[2] = ((mode & 0400) ? 'r' : '-');
 144         buffer[3] = ((mode & 0200) ? 'w' : '-');
 145         buffer[4] = ((mode & 0100) ? 'a' : '-');
 146         buffer[5] = ((mode & 0040) ? 'r' : '-');
 147         buffer[6] = ((mode & 0020) ? 'w' : '-');
 148         buffer[7] = ((mode & 0010) ? 'a' : '-');
 149         buffer[8] = ((mode & 0004) ? 'r' : '-');
 150         buffer[9] = ((mode & 0002) ? 'w' : '-');
 151         buffer[10] = ((mode & 0001) ? 'a' : '-');
 152         buffer[11] = '\0';
 153         return (&buffer[0]);
 154 }
 155
 156 void
 157 cvt_time(time_t t, char *buf)
 158 {
 159         struct tm *tm;
 160
 161         if (t == 0) {
 162                 strcpy(buf, "no-entry");
 163         } else {
 164                 tm = localtime(&t);
 165                 sprintf(buf, "%2d:%02d:%02d",
 166                         tm->tm_hour, tm->tm_min, tm->tm_sec);
 167         }
 168 }
 169 #define SHMINFO         1
 170 #define SHMTOTAL        2
 171 #define MSGINFO         4
 172 #define MSGTOTAL        8
 173 #define SEMINFO         16
 174 #define SEMTOTAL        32
 175
 176 #define BIGGEST         1
 177 #define CREATOR         2
 178 #define OUTSTANDING     4
 179 #define PID             8
 180 #define TIME            16
 181
 182 int
 183 main(int argc, char *argv[])
 184 {
 185         int     display = SHMINFO | MSGINFO | SEMINFO;
 186         int     option = 0;
 187         char   *core = NULL, *user = NULL, *namelist = NULL;
 188         char    kvmoferr[_POSIX2_LINE_MAX];  /* Error buf for kvm_openfiles. */
 189         int     i;
 190         uid_t   uid;
 191
 192         while ((i = getopt(argc, argv, "MmQqSsabC:cN:optTu:y")) != -1)
 193                 switch (i) {
 194                 case 'M':
 195                         display = SHMTOTAL;
 196                         break;
 197                 case 'm':
 198                         display = SHMINFO;
 199                         break;
 200                 case 'Q':
 201                         display = MSGTOTAL;
 202                         break;
 203                 case 'q':
 204                         display = MSGINFO;
 205                         break;
 206                 case 'S':
 207                         display = SEMTOTAL;
 208                         break;
 209                 case 's':
 210                         display = SEMINFO;
 211                         break;
 212                 case 'T':
 213                         display = SHMTOTAL | MSGTOTAL | SEMTOTAL;
 214                         break;
 215                 case 'a':
 216                         option |= BIGGEST | CREATOR | OUTSTANDING | PID | TIME;
 217                         break;
 218                 case 'b':
 219                         option |= BIGGEST;
 220                         break;
 221                 case 'C':
 222                         core = optarg;
 223                         break;
 224                 case 'c':
 225                         option |= CREATOR;
 226                         break;
 227                 case 'N':
 228                         namelist = optarg;
 229                         break;
 230                 case 'o':
 231                         option |= OUTSTANDING;
 232                         break;
 233                 case 'p':
 234                         option |= PID;
 235                         break;
 236                 case 't':
 237                         option |= TIME;
 238                         break;
 239                 case 'y':
 240                         use_sysctl = 0;
 241                         break;
 242                 case 'u':
 243                         user = optarg;
 244                         uid = user2uid(user);
 245                         break;
 246                 default:
 247                         usage();
 248                 }
 249
 250         /*
 251          * If paths to the exec file or core file were specified, we
 252          * aren't operating on the running kernel, so we can't use
 253          * sysctl.
 254          */
 255         if (namelist != NULL || core != NULL)
 256                 use_sysctl = 0;
 257
 258         if (!use_sysctl) {
 259                 kd = kvm_openfiles(namelist, core, NULL, O_RDONLY, kvmoferr);
 260                 if (kd == NULL)
 261                         errx(1, "kvm_openfiles: %s", kvmoferr);
 262                 switch (kvm_nlist(kd, symbols)) {
 263                 case 0:
 264                         break;
 265                 case -1:
 266                         errx(1, "unable to read kernel symbol table");
 267                 default:
 268 #ifdef notdef           /* they'll be told more civilly later */
 269                         warnx("nlist failed");
 270                         for (i = 0; symbols[i].n_name != NULL; i++)
 271                                 if (symbols[i].n_value == 0)
 272                                         warnx("symbol %s not found",
 273                                             symbols[i].n_name);
 274 #endif
 275                         break;
 276                 }
 277         }
 278
 279         kget(X_MSGINFO, &msginfo, sizeof(msginfo));
 280         if ((display & (MSGINFO | MSGTOTAL))) {
 281                 if (display & MSGTOTAL) {
 282                         printf("msginfo:\n");
 283                         printf("\tmsgmax: %12d\t(max characters in a message)\n",
 284                             msginfo.msgmax);
 285                         printf("\tmsgmni: %12d\t(# of message queues)\n",
 286                             msginfo.msgmni);
 287                         printf("\tmsgmnb: %12d\t(max characters in a message queue)\n",
 288                             msginfo.msgmnb);
 289                         printf("\tmsgtql: %12d\t(max # of messages in system)\n",
 290                             msginfo.msgtql);
 291                         printf("\tmsgssz: %12d\t(size of a message segment)\n",
 292                             msginfo.msgssz);
 293                         printf("\tmsgseg: %12d\t(# of message segments in system)\n\n",
 294                             msginfo.msgseg);
 295                 }
 296                 if (display & MSGINFO) {
 297                         struct msqid_kernel *kxmsqids;
 298                         size_t kxmsqids_len;
 299
 300
 301                         kxmsqids_len = sizeof(struct msqid_kernel) * msginfo.msgmni;
 302                         kxmsqids = malloc(kxmsqids_len);
 303                         kget(X_MSQIDS, kxmsqids, kxmsqids_len);
 304
 305                         printf("Message Queues:\n");
 306                         printf("T %12s %12s %-11s %-8s %-8s", "ID", "KEY", "MODE",
 307                             "OWNER", "GROUP");
 308                         if (option & CREATOR)
 309                                 printf(" %-8s %-8s", "CREATOR", "CGROUP");
 310                         if (option & OUTSTANDING)
 311                                 printf(" %20s %20s", "CBYTES", "QNUM");
 312                         if (option & BIGGEST)
 313                                 printf(" %20s", "QBYTES");
 314                         if (option & PID)
 315                                 printf(" %12s %12s", "LSPID", "LRPID");
 316                         if (option & TIME)
 317                                 printf(" %-8s %-8s %-8s", "STIME", "RTIME", "CTIME");
 318                         printf("\n");
 319                         for (i = 0; i < msginfo.msgmni; i += 1) {
 320                                 if (kxmsqids[i].u.msg_qbytes != 0) {
 321                                         char    stime_buf[100], rtime_buf[100],
 322                                                 ctime_buf[100];
 323                                         struct msqid_kernel *kmsqptr = &kxmsqids[i];
 324
 325                                         if (user)
 326                                                 if (uid != kmsqptr->u.msg_perm.uid)
 327                                                         continue;
 328                                         cvt_time(kmsqptr->u.msg_stime, stime_buf);
 329                                         cvt_time(kmsqptr->u.msg_rtime, rtime_buf);
 330                                         cvt_time(kmsqptr->u.msg_ctime, ctime_buf);
 331
 332                                         printf("q %12d %12d %s %8s %8s",
 333                                             IXSEQ_TO_IPCID(i, kmsqptr->u.msg_perm),
 334                                             (int)kmsqptr->u.msg_perm.key,
 335                                             fmt_perm(kmsqptr->u.msg_perm.mode),
 336                                             user_from_uid(kmsqptr->u.msg_perm.uid, 0),
 337                                             group_from_gid(kmsqptr->u.msg_perm.gid, 0));
 338
 339                                         if (option & CREATOR)
 340                                                 printf(" %8s %8s",
 341                                                     user_from_uid(kmsqptr->u.msg_perm.cuid, 0),
 342                                                     group_from_gid(kmsqptr->u.msg_perm.cgid, 0));
 343
 344                                         if (option & OUTSTANDING)
 345                                                 printf(" %12lu %12lu",
 346                                                     kmsqptr->u.msg_cbytes,
 347                                                     kmsqptr->u.msg_qnum);
 348
 349                                         if (option & BIGGEST)
 350                                                 printf(" %20lu",
 351                                                     kmsqptr->u.msg_qbytes);
 352
 353                                         if (option & PID)
 354                                                 printf(" %12d %12d",
 355                                                     kmsqptr->u.msg_lspid,
 356                                                     kmsqptr->u.msg_lrpid);
 357
 358                                         if (option & TIME)
 359                                                 printf(" %s %s %s",
 360                                                     stime_buf,
 361                                                     rtime_buf,
 362                                                     ctime_buf);
 363
 364                                         printf("\n");
 365                                 }
 366                         }
 367                         printf("\n");
 368                 }
 369         } else
 370                 if (display & (MSGINFO | MSGTOTAL)) {
 371                         fprintf(stderr,
 372                             "SVID messages facility not configured in the system\n");
 373                 }
 374
 375         kget(X_SHMINFO, &shminfo, sizeof(shminfo));
 376         if ((display & (SHMINFO | SHMTOTAL))) {
 377                 if (display & SHMTOTAL) {
 378                         printf("shminfo:\n");
 379                         printf("\tshmmax: %12d\t(max shared memory segment size)\n",
 380                             shminfo.shmmax);
 381                         printf("\tshmmin: %12d\t(min shared memory segment size)\n",
 382                             shminfo.shmmin);
 383                         printf("\tshmmni: %12d\t(max number of shared memory identifiers)\n",
 384                             shminfo.shmmni);
 385                         printf("\tshmseg: %12d\t(max shared memory segments per process)\n",
 386                             shminfo.shmseg);
 387                         printf("\tshmall: %12d\t(max amount of shared memory in pages)\n\n",
 388                             shminfo.shmall);
 389                 }
 390                 if (display & SHMINFO) {
 391                         struct shmid_kernel *kxshmids;
 392                         size_t kxshmids_len;
 393
 394                         kxshmids_len = sizeof(struct shmid_kernel) * shminfo.shmmni;
 395                         kxshmids = malloc(kxshmids_len);
 396                         kget(X_SHMSEGS, kxshmids, kxshmids_len);
 397
 398                         printf("Shared Memory:\n");
 399                         printf("T %12s %12s %-11s %-8s %-8s", "ID", "KEY", "MODE",
 400                             "OWNER", "GROUP");
 401                         if (option & CREATOR)
 402                                 printf(" %-8s %-8s", "CREATOR", "CGROUP");
 403                         if (option & OUTSTANDING)
 404                                 printf(" %12s", "NATTCH");
 405                         if (option & BIGGEST)
 406                                 printf(" %12s", "SEGSZ");
 407                         if (option & PID)
 408                                 printf(" %12s %12s", "CPID", "LPID");
 409                         if (option & TIME)
 410                                 printf(" %-8s %-8s %-8s", "ATIME", "DTIME", "CTIME");
 411                         printf("\n");
 412                         for (i = 0; i < shminfo.shmmni; i += 1) {
 413                                 if (kxshmids[i].u.shm_perm.mode & 0x0800) {
 414                                         char    atime_buf[100], dtime_buf[100],
 415                                                 ctime_buf[100];
 416                                         struct shmid_kernel *kshmptr = &kxshmids[i];
 417
 418                                         if (user)
 419                                                 if (uid != kshmptr->u.shm_perm.uid)
 420                                                         continue;
 421                                         cvt_time(kshmptr->u.shm_atime, atime_buf);
 422                                         cvt_time(kshmptr->u.shm_dtime, dtime_buf);
 423                                         cvt_time(kshmptr->u.shm_ctime, ctime_buf);
 424
 425                                         printf("m %12d %12d %s %8s %8s",
 426                                             IXSEQ_TO_IPCID(i, kshmptr->u.shm_perm),
 427                                             (int)kshmptr->u.shm_perm.key,
 428                                             fmt_perm(kshmptr->u.shm_perm.mode),
 429                                             user_from_uid(kshmptr->u.shm_perm.uid, 0),
 430                                             group_from_gid(kshmptr->u.shm_perm.gid, 0));
 431
 432                                         if (option & CREATOR)
 433                                                 printf(" %8s %8s",
 434                                                     user_from_uid(kshmptr->u.shm_perm.cuid, 0),
 435                                                     group_from_gid(kshmptr->u.shm_perm.cgid, 0));
 436
 437                                         if (option & OUTSTANDING)
 438                                                 printf(" %12d",
 439                                                     kshmptr->u.shm_nattch);
 440
 441                                         if (option & BIGGEST)
 442                                                 printf(" %12d",
 443                                                     kshmptr->u.shm_segsz);
 444
 445                                         if (option & PID)
 446                                                 printf(" %12d %12d",
 447                                                     kshmptr->u.shm_cpid,
 448                                                     kshmptr->u.shm_lpid);
 449
 450                                         if (option & TIME)
 451                                                 printf(" %s %s %s",
 452                                                     atime_buf,
 453                                                     dtime_buf,
 454                                                     ctime_buf);
 455
 456                                         printf("\n");
 457                                 }
 458                         }
 459                         printf("\n");
 460                 }
 461         } else
 462                 if (display & (SHMINFO | SHMTOTAL)) {
 463                         fprintf(stderr,
 464                             "SVID shared memory facility not configured in the system\n");
 465                 }
 466
 467         kget(X_SEMINFO, &seminfo, sizeof(seminfo));
 468         if ((display & (SEMINFO | SEMTOTAL))) {
 469                 struct semid_kernel *kxsema;
 470                 size_t kxsema_len;
 471
 472                 if (display & SEMTOTAL) {
 473                         printf("seminfo:\n");
 474                         printf("\tsemmap: %12d\t(# of entries in semaphore map)\n",
 475                             seminfo.semmap);
 476                         printf("\tsemmni: %12d\t(# of semaphore identifiers)\n",
 477                             seminfo.semmni);
 478                         printf("\tsemmns: %12d\t(# of semaphores in system)\n",
 479                             seminfo.semmns);
 480                         printf("\tsemmnu: %12d\t(# of undo structures in system)\n",
 481                             seminfo.semmnu);
 482                         printf("\tsemmsl: %12d\t(max # of semaphores per id)\n",
 483                             seminfo.semmsl);
 484                         printf("\tsemopm: %12d\t(max # of operations per semop call)\n",
 485                             seminfo.semopm);
 486                         printf("\tsemume: %12d\t(max # of undo entries per process)\n",
 487                             seminfo.semume);
 488                         printf("\tsemusz: %12d\t(size in bytes of undo structure)\n",
 489                             seminfo.semusz);
 490                         printf("\tsemvmx: %12d\t(semaphore maximum value)\n",
 491                             seminfo.semvmx);
 492                         printf("\tsemaem: %12d\t(adjust on exit max value)\n\n",
 493                             seminfo.semaem);
 494                 }
 495                 if (display & SEMINFO) {
 496                         kxsema_len = sizeof(struct semid_kernel) * seminfo.semmni;
 497                         kxsema = malloc(kxsema_len);
 498                         kget(X_SEMA, kxsema, kxsema_len);
 499
 500                         printf("Semaphores:\n");
 501                         printf("T %12s %12s %-11s %-8s %-8s", "ID", "KEY", "MODE",
 502                             "OWNER", "GROUP");
 503                         if (option & CREATOR)
 504                                 printf(" %-8s %-8s", "CREATOR", "CGROUP");
 505                         if (option & BIGGEST)
 506                                 printf(" %12s", "NSEMS");
 507                         if (option & TIME)
 508                                 printf(" %-8s %-8s", "OTIME", "CTIME");
 509                         printf("\n");
 510                         for (i = 0; i < seminfo.semmni; i += 1) {
 511                                 if ((kxsema[i].u.sem_perm.mode & SEM_ALLOC) != 0) {
 512                                         char    ctime_buf[100], otime_buf[100];
 513                                         struct semid_kernel *ksemaptr = &kxsema[i];
 514
 515                                         if (user)
 516                                                 if (uid != ksemaptr->u.sem_perm.uid)
 517                                                         continue;
 518                                         cvt_time(ksemaptr->u.sem_otime, otime_buf);
 519                                         cvt_time(ksemaptr->u.sem_ctime, ctime_buf);
 520
 521                                         printf("s %12d %12d %s %8s %8s",
 522                                             IXSEQ_TO_IPCID(i, ksemaptr->u.sem_perm),
 523                                             (int)ksemaptr->u.sem_perm.key,
 524                                             fmt_perm(ksemaptr->u.sem_perm.mode),
 525                                             user_from_uid(ksemaptr->u.sem_perm.uid, 0),
 526                                             group_from_gid(ksemaptr->u.sem_perm.gid, 0));
 527
 528                                         if (option & CREATOR)
 529                                                 printf(" %8s %8s",
 530                                                     user_from_uid(ksemaptr->u.sem_perm.cuid, 0),
 531                                                     group_from_gid(ksemaptr->u.sem_perm.cgid, 0));
 532
 533                                         if (option & BIGGEST)
 534                                                 printf(" %12d",
 535                                                     ksemaptr->u.sem_nsems);
 536
 537                                         if (option & TIME)
 538                                                 printf(" %s %s",
 539                                                     otime_buf,
 540                                                     ctime_buf);
 541
 542                                         printf("\n");
 543                                 }
 544                         }
 545
 546                         printf("\n");
 547                 }
 548         } else
 549                 if (display & (SEMINFO | SEMTOTAL)) {
 550                         fprintf(stderr, "SVID semaphores facility not configured in the system\n");
 551                 }
 552         if (!use_sysctl)
 553                 kvm_close(kd);
 554
 555         exit(0);
 556 }
 557
 558 void
 559 sysctlgatherstruct(void *addr, size_t size, struct scgs_vector *vecarr)
 560 {
 561         struct scgs_vector *xp;
 562         size_t tsiz;
 563         int rv;
 564
 565         for (xp = vecarr; xp->sysctl != NULL; xp++) {
 566                 assert(xp->offset <= size);
 567                 tsiz = xp->size;
 568                 rv = sysctlbyname(xp->sysctl, (char *)addr + xp->offset,
 569                     &tsiz, NULL, 0);
 570                 if (rv == -1)
 571                         err(1, "sysctlbyname: %s", xp->sysctl);
 572                 if (tsiz != xp->size)
 573                         errx(1, "%s size mismatch (expected %d, got %d)",
 574                             xp->sysctl, xp->size, tsiz);
 575         }
 576 }
 577
 578 void
 579 kget(int idx, void *addr, size_t size)
 580 {
 581         char *symn;                     /* symbol name */
 582         size_t tsiz;
 583         int rv;
 584         unsigned long kaddr;
 585         const char *sym2sysctl[] = {    /* symbol to sysctl name table */
 586                 "kern.ipc.sema",
 587                 "kern.ipc.seminfo",
 588                 "kern.ipc.msginfo",
 589                 "kern.ipc.msqids",
 590                 "kern.ipc.shminfo",
 591                 "kern.ipc.shmsegs" };
 592
 593         assert((unsigned)idx <= sizeof(sym2sysctl) / sizeof(*sym2sysctl));
 594         if (!use_sysctl) {
 595                 symn = symbols[idx].n_name;
 596                 if (*symn == '_')
 597                         symn++;
 598                 if (symbols[idx].n_type == 0 || symbols[idx].n_value == 0)
 599                         errx(1, "symbol %s undefined", symn);
 600                 /*
 601                  * For some symbols, the value we retreieve is
 602                  * actually a pointer; since we want the actual value,
 603                  * we have to manually dereference it.
 604                  */
 605                 switch (idx) {
 606                 case X_MSQIDS:
 607                         tsiz = sizeof(msqids);
 608                         rv = kvm_read(kd, symbols[idx].n_value,
 609                             &msqids, tsiz);
 610                         kaddr = (u_long)msqids;
 611                         break;
 612                 case X_SHMSEGS:
 613                         tsiz = sizeof(shmsegs);
 614                         rv = kvm_read(kd, symbols[idx].n_value,
 615                             &shmsegs, tsiz);
 616                         kaddr = (u_long)shmsegs;
 617                         break;
 618                 case X_SEMA:
 619                         tsiz = sizeof(sema);
 620                         rv = kvm_read(kd, symbols[idx].n_value,
 621                             &sema, tsiz);
 622                         kaddr = (u_long)sema;
 623                         break;
 624                 default:
 625                         rv = tsiz = 0;
 626                         kaddr = symbols[idx].n_value;
 627                         break;
 628                 }
 629                 if ((unsigned)rv != tsiz)
 630                         errx(1, "%s: %s", symn, kvm_geterr(kd));
 631                 if ((unsigned)kvm_read(kd, kaddr, addr, size) != size)
 632                         errx(1, "%s: %s", symn, kvm_geterr(kd));
 633         } else {
 634                 switch (idx) {
 635                 case X_SHMINFO:
 636                         sysctlgatherstruct(addr, size, shminfo_scgsv);
 637                         break;
 638                 case X_SEMINFO:
 639                         sysctlgatherstruct(addr, size, seminfo_scgsv);
 640                         break;
 641                 case X_MSGINFO:
 642                         sysctlgatherstruct(addr, size, msginfo_scgsv);
 643                         break;
 644                 default:
 645                         tsiz = size;
 646                         rv = sysctlbyname(sym2sysctl[idx], addr, &tsiz,
 647                             NULL, 0);
 648                         if (rv == -1)
 649                                 err(1, "sysctlbyname: %s", sym2sysctl[idx]);
 650                         if (tsiz != size)
 651                                 errx(1, "%s size mismatch "
 652                                     "(expected %d, got %d)",
 653                                     sym2sysctl[idx], size, tsiz);
 654                         break;
 655                 }
 656         }
 657 }
 658
 659 uid_t
 660 user2uid(char *username)
 661 {
 662         struct passwd *pwd;
 663         uid_t uid;
 664         char *r;
 665
 666         uid = strtoul(username, &r, 0);
 667         if (!*r && r != username)
 668                 return (uid);
 669         if ((pwd = getpwnam(username)) == NULL)
 670                 errx(1, "getpwnam failed: No such user");
 671         endpwent();
 672         return (pwd->pw_uid);
 673 }
 674
 675 void
 676 usage(void)
 677 {
 678
 679         fprintf(stderr,
 680             "usage: ipcs [-abcmopqstyMQST] [-C corefile] [-N namelist] [-u user]\n");
 681         exit(1);
 682 }