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Annotation of freem/src/fma_locks.c, revision 1.1

1.1     ! snw         1: /*
        !             2:  *                            *
        !             3:  *                           * *
        !             4:  *                          *   *
        !             5:  *                     ***************
        !             6:  *                      * *       * *
        !             7:  *                       *  MUMPS  *
        !             8:  *                      * *       * *
        !             9:  *                     ***************
        !            10:  *                          *   *
        !            11:  *                           * *
        !            12:  *                            *
        !            13:  *
        !            14:  *   fma_locks.c
        !            15:  *    fmadm - locks
        !            16:  *
        !            17:  *  
        !            18:  *   Author: Serena Willis <jpw@coherent-logic.com>
        !            19:  *    Copyright (C) 1998 MUG Deutschland
        !            20:  *    Copyright (C) 2020 Coherent Logic Development LLC
        !            21:  *
        !            22:  *
        !            23:  *   This file is part of FreeM.
        !            24:  *
        !            25:  *   FreeM is free software: you can redistribute it and/or modify
        !            26:  *   it under the terms of the GNU Affero Public License as published by
        !            27:  *   the Free Software Foundation, either version 3 of the License, or
        !            28:  *   (at your option) any later version.
        !            29:  *
        !            30:  *   FreeM is distributed in the hope that it will be useful,
        !            31:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            32:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            33:  *   GNU Affero Public License for more details.
        !            34:  *
        !            35:  *   You should have received a copy of the GNU Affero Public License
        !            36:  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
        !            37:  *
        !            38:  **/
        !            39: 
        !            40: #include <stdlib.h>
        !            41: #include "config.h"
        !            42: 
        !            43: #if defined(HAVE_GETOPT_H)
        !            44: # include <getopt.h>
        !            45: #endif
        !            46: 
        !            47: #include "fmadm.h"
        !            48: 
        !            49: #include <stdio.h>
        !            50: #include <sys/types.h>
        !            51: #include <unistd.h>
        !            52: #include <ctype.h>
        !            53: #include <sys/stat.h>
        !            54: #include <fcntl.h>
        !            55: #include "locktab.h"
        !            56: 
        !            57: int unlock (char *locktab, long pid);
        !            58: long int tell (int fd);
        !            59: 
        !            60: int fma_locks_list (int optc, char **opts)
        !            61: {
        !            62: 
        !            63:     printf ("\nFreeM Lock Table\n");
        !            64:     printf ("----------------\n\n");
        !            65: 
        !            66:     locktab_dump ();
        !            67:     
        !            68:     return 0;
        !            69: } /* fma_locks_list() */
        !            70: 
        !            71: int fma_locks_remove (int optc, char **opts)
        !            72: {
        !            73: 
        !            74:     int ct;
        !            75:     int c;
        !            76:     int option_index = 0;
        !            77:     pid_t t_pid = 0;
        !            78: 
        !            79: #if defined(HAVE_GETOPT_LONG)
        !            80: 
        !            81:     struct option long_options[] = {        
        !            82:         {"pid", required_argument, 0, 'p'},
        !            83:         {0, 0, 0, 0}
        !            84:     };
        !            85: 
        !            86: #endif
        !            87: 
        !            88: #if defined(HAVE_GETOPT_LONG)
        !            89: 
        !            90:     while(1) {
        !            91:         
        !            92:         c = getopt_long (optc, opts, "p:", long_options, &option_index);
        !            93: 
        !            94:         if (c == -1) break;
        !            95: 
        !            96:         switch (c) {
        !            97: 
        !            98:             case 'p':
        !            99:                 t_pid = atol (optarg);
        !           100:                 break;
        !           101: 
        !           102:         }
        !           103:     }
        !           104: 
        !           105: 
        !           106: 
        !           107: 
        !           108: #else
        !           109: 
        !           110: #endif
        !           111: 
        !           112:     if (t_pid == 0) {
        !           113:         fprintf (stderr, "fmadm:  must supply -p or --pid argument\n");
        !           114:         return 1;
        !           115:     }
        !           116: 
        !           117:     printf ("\nRemoving all LOCKs for PID %ld:\t", t_pid);
        !           118: 
        !           119:     ct = unlock (fma_locktab, t_pid);
        !           120: 
        !           121:     if (ct >= 0) {
        !           122:         printf ("[%d MATCHES]\n\n", ct);
        !           123:     }
        !           124:     else {
        !           125:         printf ("[ERROR]\n\n");
        !           126:     }
        !           127: 
        !           128:     return ct >= 0 ? 0 : 1;
        !           129: 
        !           130: } /* fma_locks_remove() */
        !           131: 
        !           132: /* unLOCK all entries of pid */
        !           133: int unlock (char *locktab, long n_pid)           
        !           134: {
        !           135:     pid_t old_pid = pid;
        !           136:     pid = n_pid;
        !           137:     
        !           138: 
        !           139:     if (locktab_get_sem () == TRUE) {
        !           140: 
        !           141:         locktab_unlock_all ();
        !           142: 
        !           143:         pid = old_pid;
        !           144:         locktab_release_sem ();
        !           145: 
        !           146:         return 1;
        !           147:     }
        !           148:     else {
        !           149:         fprintf (stderr, "fmadm:  could not acquire LOCK table semaphore\n");
        !           150:         pid = old_pid;
        !           151:         return 0;
        !           152:     }
        !           153: 
        !           154:     pid = old_pid;
        !           155:     return 0;
        !           156: 
        !           157: } /* lock() */