[273] | 1 | /* |
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| 2 | * |
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[1934] | 3 | * Copyright (C) 1988, 1989 by the Massachusetts Institute of Technology |
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| 4 | * Developed by the MIT Student Information Processing Board (SIPB). |
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| 5 | * For copying information, see the file mit-copyright.h in this release. |
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| 6 | * |
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| 7 | */ |
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| 8 | /* |
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| 9 | * |
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[12459] | 10 | * $Id: conv_mgr.c,v 1.13 1999-02-08 14:47:09 danw Exp $ |
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[341] | 11 | * |
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[273] | 12 | * conv_mgr () -- File that contains procedure to handle conversations. This |
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| 13 | * allows multiplexing of RPC stream, setting up the correct |
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| 14 | * stream for the given module. |
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| 15 | * |
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| 16 | */ |
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[1521] | 17 | |
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| 18 | #ifndef __STDC__ |
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| 19 | #define const |
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| 20 | #endif |
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| 21 | |
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[341] | 22 | #ifndef lint |
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[1521] | 23 | static const char rcsid_conv_mgr_c[] = |
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[12459] | 24 | "$Id: conv_mgr.c,v 1.13 1999-02-08 14:47:09 danw Exp $"; |
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| 25 | #endif /* lint */ |
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[273] | 26 | |
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[415] | 27 | #include <errno.h> |
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[1521] | 28 | #include <string.h> |
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[1619] | 29 | #include "rpc.h" |
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[273] | 30 | #define NULL 0 |
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| 31 | |
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[440] | 32 | char *malloc (), *realloc(); |
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[273] | 33 | |
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| 34 | |
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| 35 | /* conversation structure */ |
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| 36 | struct conv { |
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| 37 | char *module; |
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| 38 | int port; |
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| 39 | char *hostname; |
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| 40 | char *service_id; |
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| 41 | rpc_conversation rc; |
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[1730] | 42 | int server_version; |
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[361] | 43 | int result; |
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[273] | 44 | }; |
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| 45 | |
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| 46 | /* variables for managing conversation table */ |
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| 47 | static struct conv *conv_base; |
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| 48 | static int num_convs; |
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| 49 | static int max_convs; |
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| 50 | |
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| 51 | static int cur_conv = -1; |
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| 52 | |
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| 53 | /* |
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| 54 | * |
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| 55 | * get_module () -- Procedure to return the current module. Returns a |
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| 56 | * character string (static storage) |
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| 57 | * |
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| 58 | */ |
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| 59 | char * |
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| 60 | get_module () |
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| 61 | { |
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| 62 | if (conv_base == NULL || cur_conv == -1) |
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| 63 | return (NULL); |
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| 64 | |
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| 65 | return (conv_base [cur_conv].module); |
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| 66 | } |
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| 67 | |
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| 68 | /* |
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| 69 | * |
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| 70 | * set_module () -- Procedure to bind the set of procedure calls with a |
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| 71 | * module. Binds them for all remote procedure calls in |
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| 72 | * the current process. Thus people who want to do this |
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| 73 | * temporarily should do a "get_module" to restore it back. |
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| 74 | * |
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| 75 | * |
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| 76 | */ |
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[1619] | 77 | void set_module (module,fatal_error,result) |
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| 78 | char *module; |
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| 79 | int *fatal_error,*result; |
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[273] | 80 | { |
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| 81 | char *hostname, *service_id; |
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| 82 | int port,i; |
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| 83 | rpc_conversation rc; |
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| 84 | struct conv *convp; |
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| 85 | |
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[1521] | 86 | *fatal_error = 0; |
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[273] | 87 | *result = 0; |
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| 88 | |
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| 89 | /* check to see if we've set up the module table */ |
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| 90 | if (conv_base == NULL) { |
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| 91 | conv_base = (struct conv *) malloc (5 * sizeof (struct conv)); |
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| 92 | max_convs = 5; |
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| 93 | } |
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| 94 | |
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[274] | 95 | /* see if there's a real module there */ |
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| 96 | if (!module) { |
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| 97 | cur_conv = -1; |
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| 98 | return; |
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| 99 | } |
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| 100 | |
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[273] | 101 | /* check if we're setting our current module */ |
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| 102 | if (cur_conv != -1) { |
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| 103 | if (!strcmp (module, conv_base[cur_conv].module)) { |
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| 104 | set_rpc (conv_base[cur_conv].rc); |
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| 105 | return; |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | /* Now loop through all, looking for module names for comparison */ |
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| 110 | for (i = 0; i < num_convs; i++) { |
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[1521] | 111 | if (!strcmp (module, conv_base[i].module)) { /* match */ |
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| 112 | if (conv_base[i].result != 0) { /* errored out before */ |
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[361] | 113 | *result = conv_base[i].result; |
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[1521] | 114 | *fatal_error = 1; |
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[361] | 115 | return; |
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| 116 | } |
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[273] | 117 | set_rpc (conv_base[i].rc); |
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| 118 | cur_conv = i; |
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| 119 | return; |
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| 120 | } |
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| 121 | } |
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| 122 | |
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| 123 | /* not found -- we're going to have to resolve the module name. */ |
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| 124 | resolve_module (module, &port, &hostname, &service_id, result); |
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[1521] | 125 | if (*result) { |
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| 126 | *fatal_error = 1; |
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[273] | 127 | return; |
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[1521] | 128 | } |
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[273] | 129 | |
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| 130 | /* Check through conversations, looking for resolved module */ |
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| 131 | for (i = 0; i < num_convs; i++) { |
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| 132 | convp = &conv_base [i]; |
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| 133 | if (convp -> port == port && !namcmp (hostname, convp -> hostname) |
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[1521] | 134 | && !strcmp (service_id, convp -> service_id)) { |
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| 135 | /* found match, record */ |
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| 136 | if (conv_base[i].result != 0) { /* errored out */ |
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| 137 | *result = conv_base[i].result; |
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| 138 | *fatal_error = 1; |
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| 139 | return; |
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| 140 | } |
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| 141 | rc = convp -> rc; |
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| 142 | set_rpc (rc); |
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| 143 | goto create_entry; |
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[273] | 144 | } |
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| 145 | } |
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| 146 | |
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| 147 | /* Not found. Create the rpc conversation */ |
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| 148 | rc = open_rpc (hostname, port, service_id, result); |
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| 149 | if (rc == NULL) { |
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[1521] | 150 | *fatal_error = 1; |
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| 151 | if (*result == EINTR) { /* control-C: don't create conversation */ |
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[415] | 152 | return; |
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| 153 | } |
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[273] | 154 | } |
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| 155 | |
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| 156 | create_entry: |
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| 157 | if (num_convs == max_convs) { |
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[1521] | 158 | max_convs += 2; |
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| 159 | conv_base = (struct conv *) realloc (conv_base, |
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| 160 | max_convs*sizeof (struct conv)); |
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[273] | 161 | } |
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| 162 | |
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| 163 | cur_conv = num_convs++; |
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| 164 | convp = &conv_base [cur_conv]; |
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| 165 | convp -> rc = rc; |
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[361] | 166 | convp -> result = 0; |
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| 167 | if (rc == NULL) { /* error opening, but 'remember' it */ |
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| 168 | convp -> result = *result; |
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| 169 | cur_conv = -1; |
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| 170 | } |
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[273] | 171 | convp -> hostname = malloc (strlen (hostname)+1); |
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| 172 | strcpy (convp -> hostname, hostname); |
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| 173 | convp -> service_id = malloc (strlen (service_id)+1); |
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| 174 | strcpy (convp -> service_id, service_id); |
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| 175 | convp -> module = malloc (strlen (module)+1); |
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| 176 | strcpy (convp -> module, module); |
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| 177 | convp -> port = port; |
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[1730] | 178 | |
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| 179 | convp -> server_version = get_server_version(); |
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[273] | 180 | return; |
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| 181 | } |
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| 182 | |
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| 183 | /* |
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| 184 | * |
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| 185 | * flush_convs () -- Routine to flush all conversations. |
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| 186 | * |
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| 187 | */ |
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[1619] | 188 | void flush_convs () |
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[273] | 189 | { |
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| 190 | int i,j; |
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| 191 | struct conv *convp; |
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| 192 | |
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| 193 | if (conv_base == NULL) |
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| 194 | return; |
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| 195 | |
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| 196 | for (i = 0; i < num_convs; i++) { |
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| 197 | convp = &conv_base[i]; |
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| 198 | |
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| 199 | if (convp -> rc) |
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| 200 | close_rpc (convp -> rc); |
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| 201 | free(convp -> module); |
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| 202 | free(convp -> hostname); |
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| 203 | free(convp -> service_id); |
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| 204 | |
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| 205 | /* tromp on future conversations */ |
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| 206 | for (j = i+1; j < num_convs; j++) { |
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| 207 | if (convp -> rc == conv_base[j].rc) |
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[274] | 208 | conv_base[j].rc = NULL; |
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[273] | 209 | } |
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| 210 | convp -> rc = 0; |
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| 211 | } |
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| 212 | |
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| 213 | free (conv_base); |
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| 214 | conv_base = NULL; |
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| 215 | num_convs = 0; |
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| 216 | max_convs = 0; |
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| 217 | cur_conv = -1; |
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| 218 | } |
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[361] | 219 | |
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[1730] | 220 | get_conv_server_version() |
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| 221 | { |
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| 222 | if (cur_conv == -1) |
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| 223 | return(SERVER_0); |
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| 224 | |
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| 225 | return (conv_base[cur_conv].server_version); |
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| 226 | } |
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