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Annotation of coherent/g/usr/lib/uucp/tay104/unix/seq.c, revision 1.1.1.1

1.1       root        1: /* seq.c
                      2:    Get and increment the conversation sequence number for a system.
                      3: 
                      4:    Copyright (C) 1991, 1992 Ian Lance Taylor
                      5: 
                      6:    This file is part of the Taylor UUCP package.
                      7: 
                      8:    This program is free software; you can redistribute it and/or
                      9:    modify it under the terms of the GNU General Public License as
                     10:    published by the Free Software Foundation; either version 2 of the
                     11:    License, or (at your option) any later version.
                     12: 
                     13:    This program is distributed in the hope that it will be useful, but
                     14:    WITHOUT ANY WARRANTY; without even the implied warranty of
                     15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     16:    General Public License for more details.
                     17: 
                     18:    You should have received a copy of the GNU General Public License
                     19:    along with this program; if not, write to the Free Software
                     20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     21: 
                     22:    The author of the program may be contacted at [email protected] or
                     23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
                     24:    */
                     25: 
                     26: #include "uucp.h"
                     27: 
                     28: #include "uudefs.h"
                     29: #include "uuconf.h"
                     30: #include "sysdep.h"
                     31: #include "system.h"
                     32: 
                     33: #include <errno.h>
                     34: 
                     35: /* Get the current conversation sequence number for a remote system,
                     36:    and increment it for next time.  The conversation sequence number
                     37:    is kept in a file named for the system in the directory .Sequence
                     38:    in the spool directory.  This is not compatible with other versions
                     39:    of UUCP, but it makes more sense to me.  The sequence file is only
                     40:    used if specified in the information for that system.  */
                     41: 
                     42: long
                     43: ixsysdep_get_sequence (qsys)
                     44:      const struct uuconf_system *qsys;
                     45: {
                     46:   FILE *e;
                     47:   char *zname;
                     48:   struct stat s;
                     49:   long iseq;
                     50: 
                     51:   /* This will only be called when the system is locked anyhow, so there
                     52:      is no need to use a separate lock for the conversation sequence
                     53:      file.  */
                     54:   zname = zsysdep_in_dir (".Sequence", qsys->uuconf_zname);
                     55: 
                     56:   iseq = 0;
                     57:   if (stat (zname, &s) == 0)
                     58:     {
                     59:       boolean fok;
                     60:       char *zline;
                     61:       size_t cline;
                     62: 
                     63:       /* The file should only be readable and writable by uucp.  */
                     64:       if ((s.st_mode & (S_IRWXG | S_IRWXO)) != 0)
                     65:        {
                     66:          ulog (LOG_ERROR,
                     67:                "Bad file protection for conversation sequence file");
                     68:          ubuffree (zname);
                     69:          return -1;
                     70:        }
                     71:     
                     72:       e = fopen (zname, "r+");
                     73:       if (e == NULL)
                     74:        {
                     75:          ulog (LOG_ERROR, "fopen (%s): %s", zname, strerror (errno));
                     76:          ubuffree (zname);
                     77:          return -1;
                     78:        }
                     79: 
                     80:       ubuffree (zname);
                     81: 
                     82:       fok = TRUE;
                     83:       zline = NULL;
                     84:       cline = 0;
                     85:       if (getline (&zline, &cline, e) <= 0)
                     86:        fok = FALSE;
                     87:       else
                     88:        {
                     89:          char *zend;
                     90: 
                     91:          iseq = strtol (zline, &zend, 10);
                     92:          if (zend == zline)
                     93:            fok = FALSE;
                     94:        }
                     95: 
                     96:       xfree ((pointer) zline);
                     97: 
                     98:       if (! fok)
                     99:        {
                    100:          ulog (LOG_ERROR, "Bad format for conversation sequence file");
                    101:          (void) fclose (e);
                    102:          return -1;
                    103:        }
                    104: 
                    105:       rewind (e);
                    106:     }
                    107:   else
                    108:     {
                    109:       e = esysdep_fopen (zname, FALSE, FALSE, TRUE);
                    110:       ubuffree (zname);
                    111:       if (e == NULL)
                    112:        return -1;
                    113:     }
                    114: 
                    115:   ++iseq;
                    116: 
                    117:   fprintf (e, "%ld", iseq);
                    118: 
                    119:   if (fclose (e) != 0)
                    120:     {
                    121:       ulog (LOG_ERROR, "fclose: %s", strerror (errno));
                    122:       return -1;
                    123:     }
                    124: 
                    125:   return iseq;
                    126: }

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