crontab.c

/* Copyright 1988,1990,1993,1994 by Paul Vixie
 * All rights reserved
 *
 * Distribute freely, except: don't remove my name from the source or
 * documentation (don't take credit for my work), mark your changes (don't
 * get me blamed for your possible bugs), don't alter or remove this
 * notice.  May be sold if buildable source is provided to buyer.  No
 * warrantee of any kind, express or implied, is included with this
 * software; use at your own risk, responsibility for damages (if any) to
 * anyone resulting from the use of this software rests entirely with the
 * user.
 *
 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
 * I'll try to keep a version up to date.  I can be reached as follows:
 * Paul Vixie          <paul@vix.com>          uunet!decwrl!vixie!paul
 */

#if !defined(lint) && !defined(LINT)
static char rcsid[] = "$Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $";
#endif

/* crontab - install and manage per-user crontab files
 * vix 02may87 [RCS has the rest of the log]
 * vix 26jan87 [original]
 */


#define     MAIN_PROGRAM


#include "cron.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/file.h>
#include <sys/stat.h>
#ifdef USE_UTIMES
# include <sys/time.h>
#else
# include <time.h>
# include <utime.h>
#endif
#if defined(POSIX)
# include <locale.h>
#endif


#define NHEADER_LINES 3

enum opt_t  { opt_unknown, opt_list, opt_delete, opt_edit, opt_replace };

#if DEBUGGING
static char *Options[] = { "???", "list", "delete", "edit", "replace" };
#endif


static      PID_T       Pid;
static      char        *User, *RealUser;
static      char        Filename[MAX_FNAME];
static      char        Directory[MAX_FNAME];
static      FILE        *NewCrontab = NULL;
static      int         CheckErrorCount;
static      enum opt_t  Option;
static      struct passwd     *pw;
static      void        list_cmd __P((void)),
                  delete_cmd __P((void)),
                  edit_cmd __P((void)),
                  poke_daemon __P((void)),
                  check_error __P((char *)),
                  parse_args __P((int c, char *v[]));
static      int         replace_cmd __P((void));

/* Support edit command */
static  int             create_tmp_crontab __P((void));
static  int             open_tmp_crontab __P((struct stat *fsbuf));
static  void            cleanup_tmp_crontab __P((void));

static void
usage(msg)
      char *msg;
{
      fprintf(stderr, "%s: usage error: %s\n", ProgramName, msg);
      fprintf(stderr, "usage:\t%s [-u user] file\n", ProgramName);
      fprintf(stderr, "\t%s [-u user] { -e | -l | -r }\n", ProgramName);
      fprintf(stderr, "\t\t(default operation is replace, per 1003.2)\n");
      fprintf(stderr, "\t-e\t(edit user's crontab)\n");
      fprintf(stderr, "\t-l\t(list user's crontab)\n");
      fprintf(stderr, "\t-r\t(delete user's crontab)\n");
      exit(ERROR_EXIT);
}


int
main(argc, argv)
      int   argc;
      char  *argv[];
{
      int   exitstatus;

      Pid = getpid();
      ProgramName = argv[0];

#if defined(POSIX)
      setlocale(LC_ALL, "");
#endif

#if defined(BSD)
      setlinebuf(stderr);
#endif
      parse_args(argc, argv);       /* sets many globals, opens a file */
      set_cron_cwd();
      if (!allowed(User)) {
            fprintf(stderr,
                  "You (%s) are not allowed to use this program (%s)\n",
                  User, ProgramName);
            fprintf(stderr, "See crontab(1) for more information\n");
            log_it(RealUser, Pid, "AUTH", "crontab command not allowed");
            exit(ERROR_EXIT);
      }
      exitstatus = OK_EXIT;
      switch (Option) {
      case opt_list:          list_cmd();
                        break;
      case opt_delete:  delete_cmd();
                        break;
      case opt_edit:          edit_cmd();
                        break;
      case opt_replace: if (replace_cmd() < 0)
                              exitstatus = ERROR_EXIT;
                        break;
                        /* The following was added to shut
                         -Wall up, but it will never be hit,
                         because the option parser will catch
                         it */
      case opt_unknown: usage("unknown option specified");
                        break;
      }
      exit(exitstatus);
      /*NOTREACHED*/
}
      
#if DEBUGGING
char *getoptarg = "u:lerx:";
#else
char *getoptarg = "u:ler";
#endif


static void
parse_args(argc, argv)
      int   argc;
      char  *argv[];
{
      int         argch;
      struct stat statbuf;

      if (!(pw = getpwuid(getuid()))) {
            fprintf(stderr, "%s: your UID isn't in the passwd file.\n",
                  ProgramName);
            fprintf(stderr, "bailing out.\n");
            exit(ERROR_EXIT);
      }
      if (((User=strdup(pw->pw_name)) == NULL) ||
          ((RealUser=strdup(pw->pw_name)) == NULL)) {
              fprintf(stderr, "Memory allocation error\n");
            exit(ERROR_EXIT);
      }
      Filename[0] = '\0';
      Option = opt_unknown;

      while (EOF != (argch = getopt(argc, argv, getoptarg))) {
            switch (argch) {
#if DEBUGGING
            case 'x':
                  if (!set_debug_flags(optarg))
                        usage("bad debug option");
                  usage("unrecognized option");
                  break;
#endif
            case 'u':
                  if (!(pw = getpwnam(optarg)))
                  {
                        fprintf(stderr, "%s:  user `%s' unknown\n",
                              ProgramName, optarg);
                        exit(ERROR_EXIT);
                  }
                  if ((getuid() != ROOT_UID) &&
                      (getuid() != pw->pw_uid))
                  {
                        fprintf(stderr,
                              "must be privileged to use -u\n");
                        exit(ERROR_EXIT);
                  }
                  free(User);
                  if ((User=strdup(pw->pw_name)) == NULL) {
                          fprintf(stderr, "Memory allocation error\n");
                        exit(ERROR_EXIT);
                  }
                  break;
            case 'l':
                  if (Option != opt_unknown)
                        usage("only one operation permitted");
                  Option = opt_list;
                  break;
            case 'r':
                  if (Option != opt_unknown)
                        usage("only one operation permitted");
                  Option = opt_delete;
                  break;
            case 'e':
                  if (Option != opt_unknown)
                        usage("only one operation permitted");
                  Option = opt_edit;
                  break;
            default:
                  usage("unrecognized option");
            }
      }

      endpwent();

      if (Option != opt_unknown) {
            if (argv[optind] != NULL) {
                  usage("no arguments permitted after this option");
            }
      } else {
            if (argv[optind] != NULL) {
                  Option = opt_replace;
                  (void) strncpy (Filename, argv[optind], (sizeof Filename)-1);
                  Filename[(sizeof Filename)-1] = '\0';

            } else {
                  usage("file name must be specified for replace");
            }
      }

      if (Option == opt_replace) {
            /* we have to open the file here because we're going to
             * chdir(2) into /var/cron before we get around to
             * reading the file.
             */
            if (!strcmp(Filename, "-")) {
                  NewCrontab = stdin;
            } else {
                  /* relinquish the setuid status of the binary during
                   * the open, lest nonroot users read files they should
                   * not be able to read.  we can't use access() here
                   * since there's a race condition.  thanks go out to
                   * Arnt Gulbrandsen <agulbra@pvv.unit.no> for spotting
                   * the race.
                   */

                  if (swap_uids() < OK) {
                        perror("swapping uids");
                        exit(ERROR_EXIT);
                  }
                  if (!(NewCrontab = fopen(Filename, "r"))) {
                        perror(Filename);
                        exit(ERROR_EXIT);
                  }
                  /* Make sure we opened a normal file. */
                  if (fstat(fileno(NewCrontab), &statbuf) < 0) {
                        perror("fstat");
                        exit(ERROR_EXIT);
                  }
                  if (!S_ISREG(statbuf.st_mode)) {
                        fprintf(stderr, "%s: Not a regular file.\n", Filename);
                        exit(ERROR_EXIT);
                  }
                  if (swap_uids_back() < OK) {
                        perror("swapping uids back");
                        exit(ERROR_EXIT);
                  }
            }
      }

      Debug(DMISC, ("user=%s, file=%s, option=%s\n",
                  User, Filename, Options[(int)Option]))
}


static void
list_cmd() {
      char  n[MAX_FNAME];
      FILE  *f;
      int   ch;
#ifdef DEBIAN
      int     x;
      char    *ctnh;
#endif

      log_it(RealUser, Pid, "LIST", User);
      (void) snprintf(n, MAX_FNAME, CRON_TAB(User));
      if (!(f = fopen(n, "r"))) {
            if (errno == ENOENT)
                  fprintf(stderr, "no crontab for %s\n", User);
            else
                  perror(n);
            exit(ERROR_EXIT);
      }

      /* file is open. copy to stdout, close.
       */
      Set_LineNum(1)
#ifdef DEBIAN
        /* DEBIAN: Don't list header lines unless CRONTAB_NOHEADER is
           'N'. */
        /* ignore the top few comments since we probably put them there.
         */
        if (!(ctnh = getenv("CRONTAB_NOHEADER")) ||
            toupper(*ctnh) != 'N') 
          {
          for (x = 0;  x < NHEADER_LINES;  x++) {
            ch = get_char(f);
            if (EOF == ch)
            break;
            if ('#' != ch) {
            putchar(ch);
            break;
            }
            while (EOF != (ch = get_char(f)))
            if (ch == '\n')
              break;
            if (EOF == ch)
            break;
          }
        }
#endif
      while (EOF != (ch = get_char(f)))
            putchar(ch);
      fclose(f);
}


static void
delete_cmd() {
      char  n[MAX_FNAME];

      log_it(RealUser, Pid, "DELETE", User);
      (void) snprintf(n, MAX_FNAME, CRON_TAB(User));
      if (unlink(n)) {
            if (errno == ENOENT)
                  fprintf(stderr, "no crontab for %s\n", User);
            else
                  perror(n);
            exit(ERROR_EXIT);
      }
      poke_daemon();
}


static void
check_error(msg)
      char  *msg;
{
      CheckErrorCount++;
      fprintf(stderr, "\"%s\":%d: %s\n", Filename, LineNumber-1, msg);
}


/* The next several function implement 'crontab -e' */

/* Returns -1 on error, or fd to tempfile. */
static int
create_tmp_crontab()
{
        const char *template = "/crontab.XXXXXX";
        int nfd;
        char *tmp;

        /* Create the temp directory. Note that since crontab is
           setuid(root), TMPDIR only work for root. */
      if ((tmp=getenv("TMPDIR")) && strlen(tmp) < MAX_FNAME) {
        strcpy(Directory, tmp);
      } else {
        strcpy(Directory,"/tmp");
      }

        if (strlen(Directory) + strlen(template) < MAX_FNAME) {
                strcat(Directory, template);
        } else {
                fprintf(stderr, "TMPDIR value is to long -- exiting\n");
                Directory[0] = '\0';
                return -1;
        }

        if (!mkdtemp(Directory)) {
                perror(Directory);
                Directory[0] = '\0';
                return -1;
        }

        /* Now create the actual temporary crontab file */
        if (snprintf(Filename, MAX_FNAME, "%s/crontab", Directory)
            >= MAX_FNAME) {
                fprintf(stderr, "Temporary filename too long - aborting\n");
                Filename[0] = '\0';
                return -1;
        }
        if ((nfd=open(Filename, O_CREAT|O_EXCL|O_WRONLY, 0600)) == -1) {
                perror(Filename);
                Filename[0] = '\0';
                return -1;
        }
        return nfd;
}

/* Re-open the new (temporary) crontab, and check to make sure that
   no-one is playing games. Return 0 on success, -1 on error. (Why not
   just fopen() and stat()? Because there's no guarantee that you
   fopen()ed the file you stat()ed.) */
static int
open_tmp_crontab(fsbuf)
      struct stat *fsbuf;
{
        int t;
        struct stat statbuf;

        if ((t=open(Filename, O_RDONLY)) < 0) {
                perror("Can't open tempfile after edit");
                return -1;
        }

      if (fstat(t, &statbuf) < 0) {
            perror("fstat");
            return -1;
      }
      if (statbuf.st_uid != getuid()) {
            fprintf(stderr, "Temporary crontab no longer owned by you.\n");
            return -1;;
      }

        if (!S_ISREG(statbuf.st_mode)) {
                fprintf(stderr, "The temporary crontab must remain a regular file");
                return -1;
        }

        if (statbuf.st_mtime == fsbuf->st_mtime) {
                return 1; /* No change to file */
        }

        NewCrontab = fdopen(t, "r");
        if (!NewCrontab) {
                perror("fdopen(): after edit");
                return -1;
        }
        return 0;
}

/* We can't just delete Filename, because the editor might have
   created other temporary files in there. If there's an error, we
   just bail, and let the user/admin deal with it.*/

static void
cleanup_tmp_crontab(void) 
{
        DIR *dp;
        struct dirent *ep;
        char fname[MAX_FNAME];

        if (Directory[0] == '\0') {
                return;
        }

        /* Delete contents */
        dp = opendir (Directory);
        if (dp == NULL) {
                perror(Directory);
                return;
        }

        while ((ep = readdir (dp))) {
                if (!strcmp(ep->d_name, ".") ||
                    !strcmp(ep->d_name, "..")) {
                        continue;
                }
                if (snprintf(fname, MAX_FNAME, "%s/%s",
                             Directory, ep->d_name) >= MAX_FNAME) {
                        fprintf(stderr, "filename too long to delete: %s/%s",
                                Directory, ep->d_name);
                        return;
                }
                if (unlink(fname)) {
                        perror(ep->d_name);
                        return;
                }
        }
        (void) closedir (dp);

        if (rmdir(Directory)) {
                perror(Directory);
                return;
        }
        return;
}

static void
edit_cmd() {
      char        n[MAX_FNAME], q[MAX_TEMPSTR], *editor;
      FILE        *f;
      int         ch, t, x;
      struct stat     fsbuf;
      WAIT_T            waiter;
      PID_T       pid, xpid;
      mode_t            um;
      int             add_help_text = 0;

      log_it(RealUser, Pid, "BEGIN EDIT", User);
      (void) snprintf(n, MAX_FNAME, CRON_TAB(User));
      if (!(f = fopen(n, "r"))) {
            if (errno != ENOENT) {
                  perror(n);
                  exit(ERROR_EXIT);
            }
            fprintf(stderr, "no crontab for %s - using an empty one\n",
                  User);
            if (!(f = fopen("/dev/null", "r"))) {
                  perror("/dev/null");
                  exit(ERROR_EXIT);
            }
            add_help_text = 1;
      }

      um = umask(077);

        if ((t=create_tmp_crontab()) < 0) {
                fprintf(stderr, "Creation of temporary crontab file failed - aborting\n");
                (void) umask(um);
            goto fatal;
      }

      (void) umask(um);
      if (!(NewCrontab = fdopen(t, "w"))) {
            perror("fdopen");
            goto fatal;
      }

      Set_LineNum(1)

      if (add_help_text) {
            fprintf(NewCrontab, "# m h  dom mon dow   command\n" );
      }

      /* ignore the top few comments since we probably put them there.
       */
      for (x = 0;  x < NHEADER_LINES;  x++) {
            ch = get_char(f);
            if (EOF == ch)
                  break;
            if ('#' != ch) {
                  putc(ch, NewCrontab);
                  break;
            }
            while (EOF != (ch = get_char(f)))
                  if (ch == '\n')
                        break;
            if (EOF == ch)
                  break;
      }

      /* copy the rest of the crontab (if any) to the temp file.
       */
      if (EOF != ch)
            while (EOF != (ch = get_char(f)))
                  putc(ch, NewCrontab);
      fclose(f);

      if (ferror(NewCrontab)) {
            fprintf(stderr, "%s: error while writing new crontab to %s\n",
                  ProgramName, Filename);
      }

      if (fstat(t, &fsbuf) < 0) {
            perror("unable to stat temp file");
            goto fatal;
      }



        /* Okay, edit the file */

      if ((!((editor = getenv("VISUAL")) && strlen(editor)))
       && (!((editor = getenv("EDITOR")) && strlen(editor)))
          ) {
            editor = EDITOR;
      }


      if (fclose(NewCrontab) != 0) {
            perror(Filename);
                goto fatal;
      }

again: /* Loop point for retrying edit after error */

      /* Turn off signals. */
      (void)signal(SIGHUP, SIG_IGN);
      (void)signal(SIGINT, SIG_IGN);
      (void)signal(SIGQUIT, SIG_IGN);

        /* Give up privileges while editing */
        swap_uids();

      switch (pid = fork()) {
      case -1:
            perror("fork");
            goto fatal;
      case 0:
            /* child */
                if (setgid(getgid()) < 0) {
                        perror("setgid(getgid())");
                        exit(ERROR_EXIT);
                }
                if (setuid(getuid()) < 0) {
                        perror("setuid(getuid())");
                        exit(ERROR_EXIT);
                }
            if (chdir("/tmp") < 0) {
                  perror("chdir(/tmp)");
                  exit(ERROR_EXIT);
            }
            if (strlen(editor) + strlen(Filename) + 2 >= MAX_TEMPSTR) {
                  fprintf(stderr, "%s: editor or filename too long\n",
                        ProgramName);
                  exit(ERROR_EXIT);
            }
            snprintf(q, MAX_TEMPSTR, "%s %s", editor, Filename);
            execlp(_PATH_BSHELL, _PATH_BSHELL, "-c", q, NULL);
            perror(editor);
            exit(ERROR_EXIT);
            /*NOTREACHED*/
      default:
            /* parent */
            break;
      }

      /* parent */
      while (1) {
            xpid = waitpid(pid, &waiter, WUNTRACED);
            if (xpid == -1) {
                  fprintf(stderr, "%s: waitpid() failed waiting for PID %d from \"%s\": %s\n",
                        ProgramName, pid, editor, strerror(errno));
            } else if (xpid != pid) {
                  fprintf(stderr, "%s: wrong PID (%d != %d) from \"%s\"\n",
                        ProgramName, xpid, pid, editor);
                  goto fatal;
            } else if (WIFSTOPPED(waiter)) {
                    /* raise(WSTOPSIG(waiter)); Not needed and breaks in job control shell*/
            } else if (WIFEXITED(waiter) && WEXITSTATUS(waiter)) {
                  fprintf(stderr, "%s: \"%s\" exited with status %d\n",
                        ProgramName, editor, WEXITSTATUS(waiter));
                  goto fatal;
            } else if (WIFSIGNALED(waiter)) {
                  fprintf(stderr,
                        "%s: \"%s\" killed; signal %d (%score dumped)\n",
                        ProgramName, editor, WTERMSIG(waiter),
                        WCOREDUMP(waiter) ?"" :"no ");
                  goto fatal;
            } else
                  break;
      }
      (void)signal(SIGHUP, SIG_DFL);
      (void)signal(SIGINT, SIG_DFL);
      (void)signal(SIGQUIT, SIG_DFL);
      (void)signal(SIGTSTP, SIG_DFL);

        /* Need privs again */
        swap_uids_back();

        switch (open_tmp_crontab(&fsbuf)) {
        case -1:
                fprintf(stderr, "Error while editing crontab\n");
                goto fatal;
        case 1:
                fprintf(stderr, "No modification made\n");
                goto remove;
        case 0:
                break;
        default:
                fprintf(stderr,
                        "stevegr@debian.org fscked up. Send him a nasty note\n");
                break;
        }

      fprintf(stderr, "%s: installing new crontab\n", ProgramName);
      switch (replace_cmd()) {
      case 0:
            break;
      case -1:
            for (;;) {
                  printf("Do you want to retry the same edit? ");
                  fflush(stdout);
                  q[0] = '\0';
                  (void) fgets(q, sizeof q, stdin);
                  switch (islower(q[0]) ? q[0] : tolower(q[0])) {
                  case 'y':
                        goto again;
                  case 'n':
                        goto abandon;
                  default:
                        fprintf(stderr, "Enter Y or N\n");
                  }
            }
            /*NOTREACHED*/
      case -2:
      abandon:
            fprintf(stderr, "%s: edits left in %s\n",
                  ProgramName, Filename);
            goto done;
      default:
            fprintf(stderr, "%s: panic: bad switch() in replace_cmd()\n",
                ProgramName);
            goto fatal;
      }

 remove:
        cleanup_tmp_crontab();
 done:
      log_it(RealUser, Pid, "END EDIT", User);
        return;
 fatal:
        cleanup_tmp_crontab();
        unlink(Filename);
        exit(ERROR_EXIT);
}

static char tn[MAX_FNAME];

static void sig_handler(int x)
{
      unlink(tn);
      exit(1);
}     

/* returns  0     on success
 *          -1    on syntax error
 *          -2    on install error
 */
static int
replace_cmd() {
      char  n[MAX_FNAME], envstr[MAX_ENVSTR];
      FILE  *tmp;
      int   ch, eof, fd;
      entry *e;
      time_t      now = time(NULL);
      char  **envp = env_init();
      mode_t      um;

      if (envp == NULL) {
            fprintf(stderr, "%s: Cannot allocate memory.\n", ProgramName);
            return (-2);
      }


      /* Assumes Linux-style signal handlers (takes int, returns void) */
      /* Signal handlers, to ensure we do not leave temp files in the
         spool dir.  We don't remove these on exiting this function;
         but that's OK, we exit immediately afterwards anyway. */
      signal(SIGHUP, sig_handler);
      signal(SIGINT, sig_handler);
      signal(SIGQUIT, sig_handler);
      signal(SIGTSTP, SIG_IGN);

      (void) snprintf(tn, MAX_FNAME, CRON_TAB("tmp.XXXXXX"));
      um = umask(077);
      fd = mkstemp(tn);
      if (fd < 0) {
            perror(tn);
            return(-2);
      }
      tmp = fdopen(fd, "w+");
      if (!tmp) {
            perror(tn);
            return (-2);
      }
      (void) umask(um);

      /* write a signature at the top of the file.
       *
       * VERY IMPORTANT: make sure NHEADER_LINES agrees with this code.
       */
      fprintf(tmp, "# DO NOT EDIT THIS FILE - edit the master and reinstall.\n");
      fprintf(tmp, "# (%s installed on %-24.24s)\n", Filename, ctime(&now));
      fprintf(tmp, "# (Cron version -- %s)\n", rcsid);

      /* copy the crontab to the tmp
       */
      rewind(NewCrontab);
      Set_LineNum(1)
      while (EOF != (ch = get_char(NewCrontab)))
            putc(ch, tmp);

      if (ferror(tmp) || fflush(tmp) || fsync(fd)) {
            fprintf(stderr, "%s: error while writing new crontab to %s\n",
                  ProgramName, tn);
            perror("Error");
            fclose(tmp);  unlink(tn);
            return (-2);
      }

      /* check the syntax of the file being installed.
       */
      rewind(tmp);
      /* BUG: was reporting errors after the EOF if there were any errors
       * in the file proper -- kludged it by stopping after first error.
       *          vix 31mar87
       */
      Set_LineNum(1 - NHEADER_LINES)
      CheckErrorCount = 0;  eof = FALSE;
      while (!CheckErrorCount && !eof) {
            switch (load_env(envstr, tmp)) {
            case ERR:
                  eof = TRUE;
                  break;
            case FALSE:
                  e = load_entry(tmp, check_error, pw, envp);
                  if (e)
                        free(e);
                  break;
            case TRUE:
                  break;
            }
      }

      if (CheckErrorCount != 0) {
            fprintf(stderr, "errors in crontab file, can't install.\n");
            fclose(tmp);  unlink(tn);
            return (-1);
      }


#ifdef HAS_FCHMOD
      if (fchmod(fileno(tmp), 0600) < OK)
#else
      if (chmod(tn, 0600) < OK)
#endif
      {
            perror("chmod");
            fclose(tmp);  unlink(tn);
            return (-2);
      }


      if (fclose(tmp) == EOF) {
            perror("fclose");
            unlink(tn);
            return (-2);
      }

        /* Root on behalf of another user must set file owner to that user */
        if (getuid() == ROOT_UID && strcmp(User, RealUser) != 0) {
            if (chown(tn, pw->pw_uid, -1) != 0) {
                perror("chown");
                unlink(tn);
                return -2;
            }
        }

      (void) snprintf(n, sizeof(n), CRON_TAB(User));
      if (rename(tn, n)) {
            fprintf(stderr, "%s: error renaming %s to %s\n",
                  ProgramName, tn, n);
            perror("rename");
            unlink(tn);
            return (-2);
      }


      log_it(RealUser, Pid, "REPLACE", User);

      poke_daemon();

      return (0);
}


static void
poke_daemon() {
#ifdef USE_UTIMES
      struct timeval tvs[2];
      struct timezone tz;

      (void) gettimeofday(&tvs[0], &tz);
      tvs[1] = tvs[0];
      if (utimes(SPOOL_DIR, tvs) < OK) {
            fprintf(stderr, "crontab: can't update mtime on spooldir\n");
            perror(SPOOL_DIR);
            return;
      }
#else
      if (utime(SPOOL_DIR, NULL) < OK) {
            fprintf(stderr, "crontab: can't update mtime on spooldir\n");
            perror(SPOOL_DIR);
            return;
      }
#endif /*USE_UTIMES*/
}