sbin/slattach/slattach.c

   1 /*
   2  * Copyright (c) 1988 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Adams.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#) Copyright (c) 1988 Regents of the University of California. All rights reserved.
  33  * @(#)slattach.c       4.6 (Berkeley) 6/1/90
  34  * $FreeBSD: src/sbin/slattach/slattach.c,v 1.36 1999/08/28 00:14:25 peter Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/socket.h>
  40
  41 #include <err.h>
  42 #include <fcntl.h>
  43 #include <libutil.h>
  44 #include <paths.h>
  45 #include <signal.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <syslog.h>
  50 #include <termios.h>
  51 #include <unistd.h>
  52
  53 #include <net/if.h>
  54 #include <net/slip.h>
  55
  56 #define DEFAULT_BAUD    9600
  57
  58 static void sighup_handler(int);        /* SIGHUP handler */
  59 static void sigint_handler(int);        /* SIGINT handler */
  60 static void sigterm_handler(int);       /* SIGTERM handler */
  61 static void sigurg_handler(int);        /* SIGURG handler */
  62 static void exit_handler(int);          /* run exit_cmd iff specified upon exit. */
  63 static void setup_line(int);            /* configure terminal settings */
  64 static void slip_discipline(void);      /* switch to slip line discipline */
  65 static void configure_network(void);    /* configure slip interface */
  66 static void acquire_line(void);         /* get tty device as controlling terminal */
  67 static void usage(void);
  68
  69 int     fd = -1;
  70 char    *dev = NULL;    /* path name of the tty (e.g. /dev/tty01) */
  71 char    *dvname;                /* basename of dev */
  72 int     locked = 0;             /* uucp lock active */
  73 int     flow_control = 0;       /* non-zero to enable hardware flow control. */
  74 int     modem_control = HUPCL;  /* !CLOCAL+HUPCL iff we watch carrier. */
  75 int     comstate;               /* TIOCMGET current state of serial driver */
  76 int     redial_on_startup = 0;  /* iff non-zero execute redial_cmd on startup */
  77 speed_t speed = DEFAULT_BAUD;   /* baud rate of tty */
  78 int     slflags = 0;            /* compression flags */
  79 int     unit = -1;              /* slip device unit number */
  80 int     foreground = 0;         /* act as demon if zero, else don't fork. */
  81 int     keepal = 0;             /* keepalive timeout */
  82 int     outfill = 0;            /* outfill timeout */
  83 int     sl_unit = -1;           /* unit number */
  84 int     uucp_lock = 0;          /* do uucp locking */
  85 int     exiting = 0;            /* already running exit_handler */
  86
  87 struct  termios tty;            /* tty configuration/state */
  88
  89 char    tty_path[32];           /* path name of the tty (e.g. /dev/tty01) */
  90 char    pidfilename[40];        /* e.g. /var/run/slattach.tty01.pid */
  91 char    *redial_cmd = NULL;     /* command to exec upon shutdown. */
  92 char    *config_cmd = NULL;     /* command to exec if slip unit changes. */
  93 char    *exit_cmd = NULL;               /* command to exec before exiting. */
  94
  95 static void
  96 usage(void)
  97 {
  98         fprintf(stderr, "%s\n%s\n",
  99 "usage: slattach [-acfhlnz] [-e command] [-r command] [-s speed] [-u command]",
 100 "                [-L] [-K timeout] [-O timeout] [-S unit] device");
 101         /* do not exit here */
 102 }
 103
 104 int
 105 main(int argc, char **argv)
 106 {
 107         int option;
 108
 109         while ((option = getopt(argc, argv, "ace:fhlnr:s:u:zLK:O:S:")) != -1) {
 110                 switch (option) {
 111                 case 'a':
 112                         slflags |= IFF_LINK2;
 113                         slflags &= ~IFF_LINK0;
 114                         break;
 115                 case 'c':
 116                         slflags |= IFF_LINK0;
 117                         slflags &= ~IFF_LINK2;
 118                         break;
 119                 case 'e':
 120                         exit_cmd = (char*) strdup (optarg);
 121                         break;
 122                 case 'f':
 123                         foreground = 1;
 124                         break;
 125                 case 'h':
 126                         flow_control |= CRTSCTS;
 127                         break;
 128                 case 'l':
 129                         modem_control = CLOCAL; /* clear HUPCL too */
 130                         break;
 131                 case 'n':
 132                         slflags |= IFF_LINK1;
 133                         break;
 134                 case 'r':
 135                         redial_cmd = (char*) strdup (optarg);
 136                         break;
 137                 case 's':
 138                         speed = atoi(optarg);
 139                         break;
 140                 case 'u':
 141                         config_cmd = (char*) strdup (optarg);
 142                         break;
 143                 case 'z':
 144                         redial_on_startup = 1;
 145                         break;
 146                 case 'L':
 147                         uucp_lock = 1;
 148                         break;
 149                 case 'K':
 150                         keepal = atoi(optarg);
 151                         break;
 152                 case 'O':
 153                         outfill = atoi(optarg);
 154                         break;
 155                 case 'S':
 156                         sl_unit = atoi(optarg);
 157                         break;
 158                 case '?':
 159                 default:
 160                         usage();
 161                         exit_handler(1);
 162                 }
 163         }
 164
 165         if (optind == argc - 1)
 166                 dev = argv[optind];
 167
 168         if (optind < (argc - 1))
 169             warnx("too many args, first='%s'", argv[optind]);
 170         if (optind > (argc - 1))
 171             warnx("not enough args");
 172         if (dev == NULL) {
 173                 usage();
 174                 exit_handler(2);
 175         }
 176         if (strncmp(_PATH_DEV, dev, sizeof(_PATH_DEV) - 1)) {
 177                 strcpy(tty_path, _PATH_DEV);
 178                 strcat(tty_path, "/");
 179                 strncat(tty_path, dev, 10);
 180                 dev = tty_path;
 181         }
 182         dvname = strrchr(dev, '/'); /* always succeeds */
 183         dvname++;                   /* trailing tty pathname component */
 184         snprintf(pidfilename, sizeof(pidfilename),
 185             "%sslattach.%s.pid", _PATH_VARRUN, dvname);
 186         printf("%s\n",pidfilename);
 187
 188         if (!foreground)
 189                 daemon(0,0);    /* fork, setsid, chdir /, and close std*. */
 190         /* daemon() closed stderr, so log errors from here on. */
 191         openlog("slattach",LOG_CONS|LOG_PID,LOG_DAEMON);
 192
 193         acquire_line();         /* get tty device as controlling terminal */
 194         setup_line(0);          /* configure for slip line discipline */
 195         slip_discipline();      /* switch to slip line discipline */
 196
 197         /* upon INT log a timestamp and exit.  */
 198         if (signal(SIGINT,sigint_handler) == SIG_ERR)
 199                 syslog(LOG_NOTICE,"cannot install SIGINT handler: %m");
 200         /* upon TERM log a timestamp and exit.  */
 201         if (signal(SIGTERM,sigterm_handler) == SIG_ERR)
 202                 syslog(LOG_NOTICE,"cannot install SIGTERM handler: %m");
 203         /* upon HUP redial and reconnect.  */
 204         if (signal(SIGHUP,sighup_handler) == SIG_ERR)
 205                 syslog(LOG_NOTICE,"cannot install SIGHUP handler: %m");
 206
 207         if (redial_on_startup)
 208                 sighup_handler(0);
 209         else if (!(modem_control & CLOCAL)) {
 210                 if (ioctl(fd, TIOCMGET, &comstate) < 0)
 211                         syslog(LOG_NOTICE,"cannot get carrier state: %m");
 212                 if (!(comstate & TIOCM_CD)) { /* check for carrier */
 213                         /* force a redial if no carrier */
 214                         kill (getpid(), SIGHUP);
 215                 } else
 216                         configure_network();
 217         } else
 218                 configure_network(); /* configure the network if needed. */
 219
 220         for (;;) {
 221                 sigset_t mask;
 222                 sigemptyset(&mask);
 223                 sigsuspend(&mask);
 224         }
 225 }
 226
 227 /* Close all FDs, fork, reopen tty port as 0-2, and make it the
 228    controlling terminal for our process group. */
 229 static void
 230 acquire_line(void)
 231 {
 232         int ttydisc = TTYDISC;
 233         int oflags;
 234         FILE *pid_file;
 235
 236         /* reset to tty discipline */
 237         if (fd >= 0 && ioctl(fd, TIOCSETD, &ttydisc) < 0) {
 238                 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
 239                 exit_handler(1);
 240         }
 241
 242         close(STDIN_FILENO); /* close FDs before forking. */
 243         close(STDOUT_FILENO);
 244         close(STDERR_FILENO);
 245         if (fd > 2)
 246                 close(fd);
 247
 248         signal(SIGHUP, SIG_IGN); /* ignore HUP signal when parent dies. */
 249         if (daemon(0,0)) {       /* fork, setsid, chdir /, and close std*. */
 250                 syslog(LOG_ERR, "daemon(0,0): %m");
 251                 exit_handler(1);
 252         }
 253
 254         while (getppid () != 1)
 255                 sleep (1);      /* Wait for parent to die. */
 256
 257         /* create PID file */
 258         if((pid_file = fopen(pidfilename, "w"))) {
 259                 fprintf(pid_file, "%ld\n", (long)getpid());
 260                 fclose(pid_file);
 261         }
 262
 263         if (signal(SIGHUP,sighup_handler) == SIG_ERR) /* Re-enable HUP signal */
 264                 syslog(LOG_NOTICE,"cannot install SIGHUP handler: %m");
 265
 266         if (uucp_lock) {
 267                 /* unlock not needed here, always re-lock with new pid */
 268                 int res;
 269                 if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
 270                         if (res != UU_LOCK_INUSE)
 271                                 syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
 272                         syslog(LOG_ERR, "can't lock %s", dev);
 273                         exit_handler(1);
 274                 }
 275                 locked = 1;
 276         }
 277
 278         if ((fd = open(dev, O_RDWR | O_NONBLOCK, 0)) < 0) {
 279                 syslog(LOG_ERR, "open(%s) %m", dev);
 280                 exit_handler(1);
 281         }
 282         /* Turn off O_NONBLOCK for dumb redialers, if any. */
 283         if ((oflags = fcntl(fd, F_GETFL)) == -1) {
 284                 syslog(LOG_ERR, "fcntl(F_GETFL) failed: %m");
 285                 exit_handler(1);
 286         }
 287         if (fcntl(fd, F_SETFL, oflags & ~O_NONBLOCK) == -1) {
 288                 syslog(LOG_ERR, "fcntl(F_SETFL) failed: %m");
 289                 exit_handler(1);
 290         }
 291         dup2(fd, STDIN_FILENO);
 292         dup2(fd, STDOUT_FILENO);
 293         dup2(fd, STDERR_FILENO);
 294         if (fd > 2)
 295                 close (fd);
 296         fd = STDIN_FILENO;
 297
 298         /* acquire the serial line as a controlling terminal. */
 299         if (ioctl(fd, TIOCSCTTY, 0) < 0) {
 300                 syslog(LOG_ERR,"ioctl(TIOCSCTTY): %m");
 301                 exit_handler(1);
 302         }
 303         /* Make us the foreground process group associated with the
 304            slip line which is our controlling terminal. */
 305         if (tcsetpgrp(fd, getpid()) < 0)
 306                 syslog(LOG_NOTICE,"tcsetpgrp failed: %m");
 307 }
 308
 309 /* Set the tty flags and set DTR. */
 310 /* Call as setup_line(CLOCAL) to force clocal assertion. */
 311 static void
 312 setup_line(int cflag)
 313 {
 314         tty.c_lflag = tty.c_iflag = tty.c_oflag = 0;
 315         tty.c_cflag = CREAD | CS8 | flow_control | modem_control | cflag;
 316         cfsetispeed(&tty, speed);
 317         cfsetospeed(&tty, speed);
 318         /* set the line speed and flow control */
 319         if (tcsetattr(fd, TCSAFLUSH, &tty) < 0) {
 320                 syslog(LOG_ERR, "tcsetattr(TCSAFLUSH): %m");
 321                 exit_handler(1);
 322         }
 323         /* set data terminal ready */
 324         if (ioctl(fd, TIOCSDTR) < 0) {
 325                 syslog(LOG_ERR, "ioctl(TIOCSDTR): %m");
 326                 exit_handler(1);
 327         }
 328 }
 329
 330 /* Put the line in slip discipline. */
 331 static void
 332 slip_discipline(void)
 333 {
 334         struct ifreq ifr;
 335         int slipdisc = SLIPDISC;
 336         int s, tmp_unit = -1;
 337
 338         /* Switch to slip line discipline. */
 339         if (ioctl(fd, TIOCSETD, &slipdisc) < 0) {
 340                 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
 341                 exit_handler(1);
 342         }
 343
 344         if (sl_unit >= 0 && ioctl(fd, SLIOCSUNIT, &sl_unit) < 0) {
 345                 syslog(LOG_ERR, "ioctl(SLIOCSUNIT): %m");
 346                 exit_handler(1);
 347         }
 348
 349         /* find out what unit number we were assigned */
 350         if (ioctl(fd, SLIOCGUNIT, (caddr_t)&tmp_unit) < 0) {
 351                 syslog(LOG_ERR, "ioctl(SLIOCGUNIT): %m");
 352                 exit_handler(1);
 353         }
 354
 355         if (tmp_unit < 0) {
 356                 syslog(LOG_ERR, "bad unit (%d) from ioctl(SLIOCGUNIT)",tmp_unit);
 357                 exit_handler(1);
 358         }
 359
 360         if (keepal > 0) {
 361                 signal(SIGURG, sigurg_handler);
 362                 if (ioctl(fd, SLIOCSKEEPAL, &keepal) < 0) {
 363                         syslog(LOG_ERR, "ioctl(SLIOCSKEEPAL): %m");
 364                         exit_handler(1);
 365                 }
 366         }
 367         if (outfill > 0 && ioctl(fd, SLIOCSOUTFILL, &outfill) < 0) {
 368                 syslog(LOG_ERR, "ioctl(SLIOCSOUTFILL): %m");
 369                 exit_handler(1);
 370         }
 371
 372         /* open a socket as the handle to the interface */
 373         s = socket(AF_INET, SOCK_DGRAM, 0);
 374         if (s < 0) {
 375                 syslog(LOG_ERR, "socket: %m");
 376                 exit_handler(1);
 377         }
 378         sprintf(ifr.ifr_name, "sl%d", tmp_unit);
 379
 380         /* get the flags for the interface */
 381         if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 382                 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
 383                 exit_handler(1);
 384         }
 385
 386         /* Assert any compression or no-icmp flags. */
 387 #define SLMASK (~(IFF_LINK0 | IFF_LINK1 | IFF_LINK2))
 388         ifr.ifr_flags &= SLMASK;
 389         ifr.ifr_flags |= slflags;
 390         if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 391                 syslog(LOG_ERR, "ioctl (SIOCSIFFLAGS): %m");
 392                 exit_handler(1);
 393         }
 394         close(s);
 395 }
 396
 397 /* configure the interface, e.g. by passing the unit number to a script. */
 398 static void
 399 configure_network(void)
 400 {
 401         int new_unit;
 402
 403         /* find out what unit number we were assigned */
 404         if (ioctl(fd, SLIOCGUNIT, (caddr_t)&new_unit) < 0) {
 405                 syslog(LOG_ERR, "ioctl(SLIOCGUNIT): %m");
 406                 exit_handler(1);
 407         }
 408         /* iff the unit number changes either invoke config_cmd or punt. */
 409         if (config_cmd) {
 410                 char *s;
 411                 s = (char*) malloc(strlen(config_cmd) + 32);
 412                 if (s == NULL) {
 413                         syslog(LOG_ERR, "malloc failed");
 414                         exit(1);
 415                 }
 416                 sprintf (s, "%s %d %d", config_cmd, unit, new_unit);
 417                 syslog(LOG_NOTICE, "configuring %s (sl%d):", dev, unit);
 418                 syslog(LOG_NOTICE, "  '%s'", s);
 419                 system(s);
 420                 free (s);
 421                 unit = new_unit;
 422         } else {
 423                 /* don't compare unit numbers if this is the first time to attach. */
 424                 if (unit < 0)
 425                         unit = new_unit;
 426                 if (new_unit != unit) {
 427                         syslog(LOG_ERR,
 428         "slip unit changed from sl%d to sl%d, but no -u CMD was specified!",
 429                             unit, new_unit);
 430                         exit_handler(1);
 431                 }
 432                 syslog(LOG_NOTICE,"sl%d connected to %s at %d baud",unit,dev,speed);
 433         }
 434 }
 435
 436 /* sighup_handler() is invoked when carrier drops, eg. before redial. */
 437 static void
 438 sighup_handler(int signo __unused)
 439 {
 440         if(exiting) return;
 441
 442         if (redial_cmd == NULL) {
 443                 syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); exiting", dev, unit);
 444                 exit_handler(1);
 445         }
 446 again:
 447         /* invoke a shell for redial_cmd or punt. */
 448         if (*redial_cmd) { /* Non-empty redial command */
 449                 syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); running '%s'",
 450                        dev, unit, redial_cmd);
 451                 acquire_line(); /* reopen dead line */
 452                 setup_line(CLOCAL);
 453                 if (locked) {
 454                         if (uucp_lock)
 455                                 uu_unlock(dvname);      /* for redial */
 456                         locked = 0;
 457                 }
 458                 if (system(redial_cmd))
 459                         goto again;
 460                 if (uucp_lock) {
 461                         int res;
 462                         if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
 463                                 if (res != UU_LOCK_INUSE)
 464                                         syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
 465                                 syslog(LOG_ERR, "can't relock %s after %s, aborting",
 466                                         dev, redial_cmd);
 467                                 exit_handler(1);
 468                         }
 469                         locked = 1;
 470                 }
 471                 /* Now check again for carrier (dial command is done): */
 472                 if (!(modem_control & CLOCAL)) {
 473                         tty.c_cflag &= ~CLOCAL;
 474                         if (tcsetattr(fd, TCSAFLUSH, &tty) < 0) {
 475                                 syslog(LOG_ERR, "tcsetattr(TCSAFLUSH): %m");
 476                                 exit_handler(1);
 477                         }
 478                         ioctl(fd, TIOCMGET, &comstate);
 479                         if (!(comstate & TIOCM_CD)) { /* check for carrier */
 480                                 /* force a redial if no carrier */
 481                                 goto again;
 482                         }
 483                 } else
 484                         setup_line(0);
 485         } else {        /* Empty redial command */
 486                 syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); reestablish connection",
 487                         dev, unit);
 488                 acquire_line(); /* reopen dead line */
 489                 setup_line(0);  /* restore ospeed from hangup (B0) */
 490                 /* If modem control, just wait for carrier before attaching.
 491                    If no modem control, just fall through immediately. */
 492                 if (!(modem_control & CLOCAL)) {
 493                         int carrier = 0;
 494
 495                         syslog(LOG_NOTICE, "waiting for carrier on %s (sl%d)",
 496                                dev, unit);
 497                         /* Now wait for carrier before attaching line. */
 498                         /* We must poll since CLOCAL prevents signal. */
 499                         while (! carrier) {
 500                                 sleep(2);
 501                                 ioctl(fd, TIOCMGET, &comstate);
 502                                 if (comstate & TIOCM_CD)
 503                                         carrier = 1;
 504                         }
 505                         syslog(LOG_NOTICE, "carrier now present on %s (sl%d)",
 506                                dev, unit);
 507                 }
 508         }
 509         slip_discipline();
 510         configure_network();
 511 }
 512
 513 /* Signal handler for SIGINT.  We just log and exit. */
 514 static void
 515 sigint_handler(int signo __unused)
 516 {
 517         if(exiting) return;
 518         syslog(LOG_NOTICE,"SIGINT on %s (sl%d); exiting",dev,unit);
 519         exit_handler(0);
 520 }
 521
 522 /* Signal handler for SIGURG. */
 523 static void
 524 sigurg_handler(int signo __unused)
 525 {
 526         int ttydisc = TTYDISC;
 527
 528         signal(SIGURG, SIG_IGN);
 529         if(exiting) return;
 530         syslog(LOG_NOTICE,"SIGURG on %s (sl%d); hangup",dev,unit);
 531         if (ioctl(fd, TIOCSETD, &ttydisc) < 0) {
 532                 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
 533                 exit_handler(1);
 534         }
 535         cfsetospeed(&tty, B0);
 536         if (tcsetattr(fd, TCSANOW, &tty) < 0) {
 537                 syslog(LOG_ERR, "tcsetattr(TCSANOW): %m");
 538                 exit_handler(1);
 539         }
 540         /* Need to go to sighup handler in any case */
 541         if (modem_control & CLOCAL)
 542                 kill (getpid(), SIGHUP);
 543
 544 }
 545
 546 /* Signal handler for SIGTERM.  We just log and exit. */
 547 static void
 548 sigterm_handler(int signo __unused)
 549 {
 550         if(exiting) return;
 551         syslog(LOG_NOTICE,"SIGTERM on %s (sl%d); exiting",dev,unit);
 552         exit_handler(0);
 553 }
 554
 555 /* Run config_cmd if specified before exiting. */
 556 static void
 557 exit_handler(int ret)
 558 {
 559         if(exiting) return;
 560         exiting = 1;
 561         /*
 562          * First close the slip line in case exit_cmd wants it (like to hang
 563          * up a modem or something).
 564          */
 565         if (fd != -1)
 566                 close(fd);
 567         if (uucp_lock && locked)
 568                 uu_unlock(dvname);
 569
 570         /* Remove the PID file */
 571         unlink(pidfilename);
 572
 573         if (config_cmd) {
 574                 char *s;
 575                 s = (char*) malloc(strlen(config_cmd) + 32);
 576                 if (s == NULL) {
 577                         syslog(LOG_ERR, "malloc failed");
 578                         exit(1);
 579                 }
 580                 sprintf (s, "%s %d -1", config_cmd, unit);
 581                 syslog(LOG_NOTICE, "deconfiguring %s (sl%d):", dev, unit);
 582                 syslog(LOG_NOTICE, "  '%s'", s);
 583                 system(s);
 584                 free (s);
 585         }
 586         /* invoke a shell for exit_cmd. */
 587         if (exit_cmd) {
 588                 syslog(LOG_NOTICE,"exiting after running %s", exit_cmd);
 589                 system(exit_cmd);
 590         }
 591         exit(ret);
 592 }
 593
 594 /* local variables: */
 595 /* c-indent-level: 8 */
 596 /* c-argdecl-indent: 0 */
 597 /* c-label-offset: -8 */
 598 /* c-continued-statement-offset: 8 */
 599 /* c-brace-offset: 0 */
 600 /* comment-column: 32 */
 601 /* end: */