ust/ust.c

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdio.h>
  20 #include <unistd.h>
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <fcntl.h>
  24
  25 #include "ustcomm.h"
  26
  27 struct ust_opts {
  28         char *cmd;
  29         pid_t *pids;
  30         int take_reply;
  31 };
  32
  33 char *progname = NULL;
  34
  35 void usage(void)
  36 {
  37         fprintf(stderr, "usage: %s [OPTIONS] COMMAND PID...\n", progname);
  38         fprintf(stderr, "\nControl the tracing of a process that supports LTTng Userspace Tracing.\n\
  39 \n\
  40 Commands:\n\
  41     --start-trace\t\t\tStart tracing\n\
  42     --stop-trace\t\t\tStop tracing\n\
  43     --destroy-trace\t\t\tDestroy the trace\n\
  44     --enable-marker CHANNEL/MARKER\tEnable a marker\n\
  45     --disable-marker CHANNEL/MARKER\tDisable a marker\n\
  46     --list-markers\tList the markers of the process and their state\n\
  47 \n\
  48 ");
  49 }
  50
  51 int parse_opts_long(int argc, char **argv, struct ust_opts *opts)
  52 {
  53         int c;
  54
  55         opts->cmd = NULL;
  56         opts->pids = NULL;
  57         opts->take_reply = 0;
  58
  59         while (1) {
  60                 int option_index = 0;
  61                 static struct option long_options[] = {
  62                         {"start-trace", 0, 0, 1000},
  63                         {"stop-trace", 0, 0, 1001},
  64                         {"destroy-trace", 0, 0, 1002},
  65                         {"list-markers", 0, 0, 1004},
  66                         {"print-markers", 0, 0, 1005},
  67                         {"pid", 1, 0, 1006},
  68                         {"enable-marker", 1, 0, 1007},
  69                         {"disable-marker", 1, 0, 1008},
  70                         {"start", 0, 0, 1009},
  71                         {"help", 0, 0, 'h'},
  72                         {"version", 0, 0, 1010},
  73                         {0, 0, 0, 0}
  74                 };
  75
  76                 c = getopt_long(argc, argv, "h", long_options, &option_index);
  77                 if (c == -1)
  78                         break;
  79
  80                 switch (c) {
  81                 case 0:
  82                         printf("option %s", long_options[option_index].name);
  83                         if (optarg)
  84                                 printf(" with arg %s", optarg);
  85                         printf("\n");
  86                         break;
  87
  88                 case 1000:
  89                         opts->cmd = strdup("trace_start");
  90                         break;
  91                 case 1001:
  92                         opts->cmd = strdup("trace_stop");
  93                         break;
  94                 case 1009:
  95                         opts->cmd = strdup("start");
  96                         break;
  97                 case 1002:
  98                         opts->cmd = strdup("trace_destroy");
  99                         break;
 100                 case 1004:
 101                         opts->cmd = strdup("list_markers");
 102                         opts->take_reply = 1;
 103                         break;
 104                 case 1007:
 105                         asprintf(&opts->cmd, "enable_marker %s", optarg);
 106                         break;
 107                 case 1008:
 108                         asprintf(&opts->cmd, "disable_marker %s", optarg);
 109                         break;
 110                 case 'h':
 111                         usage();
 112                         exit(0);
 113                 case 1010:
 114                         printf("Version 0\n");
 115
 116                 default:
 117                         /* unknown option or other error; error is printed by getopt, just return */
 118                         return 1;
 119                 }
 120         }
 121
 122         if(argc - optind > 0) {
 123                 int i;
 124                 int pididx=0;
 125                 opts->pids = malloc((argc-optind+1) * sizeof(pid_t));
 126
 127                 for(i=optind; i<argc; i++) {
 128                         opts->pids[pididx++] = atoi(argv[i]);
 129                 }
 130                 opts->pids[pididx] = -1;
 131         }
 132
 133         return 0;
 134 }
 135
 136 int main(int argc, char *argv[])
 137 {
 138         pid_t *pidit;
 139         //char *msg = argv[2];
 140         struct ustcomm_connection conn;
 141         int result;
 142         struct ust_opts opts;
 143
 144         progname = argv[0];
 145
 146         if(argc <= 1) {
 147                 fprintf(stderr, "No operation specified.\n");
 148                 usage();
 149                 exit(EXIT_FAILURE);
 150         }
 151
 152         result = parse_opts_long(argc, argv, &opts);
 153         if(result) {
 154                 usage();
 155                 exit(EXIT_FAILURE);
 156         }
 157
 158         if(opts.pids == NULL) {
 159                 fprintf(stderr, "No pid specified.\n");
 160                 usage();
 161                 exit(EXIT_FAILURE);
 162         }
 163         if(opts.cmd == NULL) {
 164                 fprintf(stderr, "No command specified.\n");
 165                 usage();
 166                 exit(EXIT_FAILURE);
 167         }
 168
 169         pidit = opts.pids;
 170
 171         while(*pidit != -1) {
 172                 char *reply;
 173                 char **preply;
 174
 175                 if(opts.take_reply)
 176                         preply = &reply;
 177                 else
 178                         preply = NULL;
 179
 180                 result = ustcomm_connect_app(*pidit, &conn);
 181                 if(result) {
 182                         fprintf(stderr, "error connecting to process\n");
 183                         exit(EXIT_FAILURE);
 184                 }
 185                 ustcomm_send_request(&conn, opts.cmd, preply);
 186
 187                 if(opts.take_reply)
 188                         printf("%s", reply);
 189                 pidit++;
 190         }
 191
 192         free(opts.pids);
 193         free(opts.cmd);
 194
 195         return 0;
 196 }