1 // vim: ts=4 sw=4 noet:
3 --------------------------------------------------------------------------------
4 Copyright (c) 2018-2019 AT&T Intellectual Property.
6 Licensed under the Apache License, Version 2.0 (the "License");
7 you may not use this file except in compliance with the License.
8 You may obtain a copy of the License at
10 http://www.apache.org/licenses/LICENSE-2.0
12 Unless required by applicable law or agreed to in writing, software
13 distributed under the License is distributed on an "AS IS" BASIS,
14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 See the License for the specific language governing permissions and
16 limitations under the License.
17 --------------------------------------------------------------------------------
21 Mnemonic: mc_listener.c
22 Abstract: This application (management campaign listener) will listen for
23 RMR based messages and write the payloads into FIFOs which
24 correspond to the message type.
27 /var/lib/mc/listener -- directory for FIFOs
30 -d <path> FIFO directory (default is /tmp/mcl/fifos)
31 -p <port> The port to set RMR listener on (default is 4560)
32 -r <seconds> The frequency that count reports are written to
33 stderr. 0 == 0ff; default is 60.
36 RMR based environment variables which might be needed:
37 RMR_SEED_RT -- path to the static routing table
38 RMR_RTG_SVC -- port to listen for RTG connections
41 Author: E. Scott Daniels
55 //---- support -----------------------------------------------------------------------------
57 "[-d fifo-dir] [-e] [-p listen-port] [-q | -r report-freq]\n"
58 " -e disable extended header in buffers written to FIFOs\n"
60 "The following environment variables may be set to affect operation:\n"
61 " MCL_RDC_STAGE: the directory where raw data capture files are staged. (/tmp/rdc/stage)\n"
62 " MCL_RDC_FINAL: the directory where raw data capture files are placed for export. (/tmp/rdc/final)\n"
63 " MCL_RDC_SUFFIX: the suffix written on each raw data capture file; must include '.'. (.rdc)\n"
64 " MCL_RDC_SOURCE: a short string used as source identification in rdc file names.\n"
65 " MCL_RDC_FREQ: the amount of time (seconds) that raw capture files are rolled. (300)\n"
66 "\nIf either final or staging directories are defined by environment vars, they MUST exist.\n";
71 static void ba_err( char* what ) {
72 fprintf( stderr, "[ERR] option is unrecognised or isn't followed by meaningful data: %s\n", what );
75 static void usage( char* argv0 ) {
76 fprintf( stderr, "usage: %s %s\n", argv0, usage_str );
80 Exit on trapped signal allowing ctl-C or SIGTERM to stop us gracefully and capture
81 the gcda data for coverage.
83 static void sigh( int sign ) {
84 fprintf( stderr, "\n[INFO] exiting on signal %d\n", sign );
88 //------------------------------------------------------------------------------------------
89 int main( int argc, char** argv ) {
90 void* ctx; // the mc listener library context
91 char* dname = NULL; // default directory where we open fifos
93 int report_freq = 60; // report stats every n seconds
94 int pidx = 1; // parameter index
96 int long_hdrs = 1; // -e sets and causes extended headers to be written
98 signal( SIGINT, sigh );
99 signal( SIGTERM, sigh );
101 dname = strdup( "/tmp/mcl/fifos" ); // so we can always free
102 port = strdup( "4560" ); // default port
104 while( pidx < argc && argv[pidx][0] == '-' ) { // simple argument parsing (-x or -x value)
105 switch( argv[pidx][1] ) {
107 if( pidx+1 < argc ) {
109 dname = strdup( argv[pidx+1] );
112 ba_err( argv[pidx] );
122 if( pidx+1 < argc ) {
124 port = strdup( argv[pidx+1] );
127 ba_err( argv[pidx] );
137 if( pidx+1 < argc ) {
138 report_freq = atoi( argv[pidx+1] );
141 ba_err( argv[pidx] );
152 ba_err( argv[pidx] );
166 ctx = mcl_mk_context( dname ); // initialise the library context
168 fprintf( stderr, "[FAIL] couldn't initialise the mc listener environment\n" );
172 mcl_set_sigh(); // set signal handler(s)
174 mcl_start_listening( ctx, port, MCL_NOWAIT ); // start the listener, no waiting for rt since we don't send
175 mcl_fifo_fanout( ctx, report_freq, long_hdrs ); // listen and fanout messages to fifo; report to stdout every ~2sec
177 fprintf( stderr, "[INFO] mc listener is finished.\n" );
179 free( port ); // uneeded, but these keep sonar from twisting it's knickers about leaks