external/ibm-public/postfix/dist/src/master/master_conf.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      master_conf 3
   6 /* SUMMARY
   7 /*      Postfix master - master.cf file processing
   8 /* SYNOPSIS
   9 /*      #include "master.h"
  10 /*
  11 /*      void    master_config(serv)
  12 /*      MASTER_SERV *serv;
  13 /*
  14 /*      void    master_refresh(serv)
  15 /*      MASTER_SERV *serv;
  16 /* DESCRIPTION
  17 /*      Use master_config() to read the master.cf configuration file
  18 /*      during program initialization.
  19 /*
  20 /*      Use master_refresh() to re-read the master.cf configuration file
  21 /*      when the process is already running.
  22 /* DIAGNOSTICS
  23 /* BUGS
  24 /* SEE ALSO
  25 /*      master_ent(3), configuration file programmatic interface.
  26 /* LICENSE
  27 /* .ad
  28 /* .fi
  29 /*      The Secure Mailer license must be distributed with this software.
  30 /* AUTHOR(S)
  31 /*      Wietse Venema
  32 /*      IBM T.J. Watson Research
  33 /*      P.O. Box 704
  34 /*      Yorktown Heights, NY 10598, USA
  35 /*--*/
  36
  37 /* System libraries. */
  38
  39 #include <sys_defs.h>
  40 #include <unistd.h>
  41 #include <string.h>
  42
  43 /* Utility library. */
  44
  45 #include <msg.h>
  46 #include <argv.h>
  47
  48 /* Application-specific. */
  49
  50 #include "master.h"
  51
  52 /* master_refresh - re-read configuration table */
  53
  54 void    master_refresh(void)
  55 {
  56     MASTER_SERV *serv;
  57     MASTER_SERV **servp;
  58
  59     /*
  60      * Mark all existing services.
  61      */
  62     for (serv = master_head; serv != 0; serv = serv->next)
  63         serv->flags |= MASTER_FLAG_MARK;
  64
  65     /*
  66      * Read the master.cf configuration file. The master_conf() routine
  67      * unmarks services upon update. New services are born with the mark bit
  68      * off. After this, anything with the mark bit on should be removed.
  69      */
  70     master_config();
  71
  72     /*
  73      * Delete all services that are still marked - they disappeared from the
  74      * configuration file and are therefore no longer needed.
  75      */
  76     for (servp = &master_head; (serv = *servp) != 0; /* void */ ) {
  77         if ((serv->flags & MASTER_FLAG_MARK) != 0) {
  78             *servp = serv->next;
  79             master_stop_service(serv);
  80             free_master_ent(serv);
  81         } else {
  82             servp = &serv->next;
  83         }
  84     }
  85 }
  86
  87 /* master_config - read config file */
  88
  89 void    master_config(void)
  90 {
  91     MASTER_SERV *entry;
  92     MASTER_SERV *serv;
  93
  94 #define STR_DIFF        strcmp
  95 #define STR_SAME        !strcmp
  96 #define SWAP(type,a,b)  { type temp = a; a = b; b = temp; }
  97
  98     /*
  99      * A service is identified by its endpoint name AND by its transport
 100      * type, not just by its name alone. The name is unique within its
 101      * transport type. XXX Service privacy is encoded in the service name.
 102      */
 103     set_master_ent();
 104     while ((entry = get_master_ent()) != 0) {
 105         if (msg_verbose)
 106             print_master_ent(entry);
 107         for (serv = master_head; serv != 0; serv = serv->next)
 108             if (STR_SAME(serv->name, entry->name) && serv->type == entry->type)
 109                 break;
 110
 111         /*
 112          * Add a new service entry. We do not really care in what order the
 113          * service entries are kept in memory.
 114          */
 115         if (serv == 0) {
 116             entry->next = master_head;
 117             master_head = entry;
 118             master_start_service(entry);
 119         }
 120
 121         /*
 122          * Update an existing service entry. Make the current generation of
 123          * child processes commit suicide whenever it is convenient. The next
 124          * generation of child processes will run with the new configuration
 125          * settings.
 126          */
 127         else {
 128             serv->flags &= ~MASTER_FLAG_MARK;
 129             if (entry->flags & MASTER_FLAG_CONDWAKE)
 130                 serv->flags |= MASTER_FLAG_CONDWAKE;
 131             else
 132                 serv->flags &= ~MASTER_FLAG_CONDWAKE;
 133             serv->wakeup_time = entry->wakeup_time;
 134             serv->max_proc = entry->max_proc;
 135             serv->throttle_delay = entry->throttle_delay;
 136             SWAP(char *, serv->ext_name, entry->ext_name);
 137             SWAP(char *, serv->path, entry->path);
 138             SWAP(ARGV *, serv->args, entry->args);
 139             SWAP(char *, serv->stress_param_val, entry->stress_param_val);
 140             master_restart_service(serv);
 141             free_master_ent(entry);
 142         }
 143     }
 144     end_master_ent();
 145 }