tests/utils/testapp/gen-ust-events/gen-ust-events.c

   1 /*
   2  * Copyright (C) - 2012 David Goulet <dgoulet@efficios.com>
   3  *
   4  * This library is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License as published by the
   6  * Free Software Foundation; version 2.1 of the License.
   7  *
   8  * This library is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  11  * for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this library; if not, write to the Free Software Foundation,
  15  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <arpa/inet.h>
  21 #include <fcntl.h>
  22 #include <stdarg.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/mman.h>
  27 #include <sys/stat.h>
  28 #include <sys/types.h>
  29 #include <unistd.h>
  30 #include <stdbool.h>
  31 #include <signal.h>
  32 #include <poll.h>
  33 #include <errno.h>
  34
  35 #define TRACEPOINT_DEFINE
  36 #include "tp.h"
  37
  38 void create_file(const char *path)
  39 {
  40         static bool file_created = false;
  41         int ret;
  42
  43         if (!path || file_created) {
  44                 return;
  45         }
  46
  47         ret = creat(path, S_IRWXU);
  48         if (ret < 0) {
  49                 fprintf(stderr, "Failed to create file %s\n", path);
  50                 return;
  51         }
  52
  53         (void) close(ret);
  54         file_created = true;
  55 }
  56
  57 static
  58 void wait_on_file(const char *path)
  59 {
  60         if (!path) {
  61                 return;
  62         }
  63         for (;;) {
  64                 int ret;
  65                 struct stat buf;
  66
  67                 ret = stat(path, &buf);
  68                 if (ret == -1 && errno == ENOENT) {
  69                         (void) poll(NULL, 0, 10);       /* 10 ms delay */
  70                         continue;                       /* retry */
  71                 }
  72                 if (ret) {
  73                         perror("stat");
  74                         exit(EXIT_FAILURE);
  75                 }
  76                 break;  /* found */
  77         }
  78 }
  79
  80 int main(int argc, char **argv)
  81 {
  82         unsigned int i, netint;
  83         long values[] = { 1, 2, 3 };
  84         char text[10] = "test";
  85         double dbl = 2.0;
  86         float flt = 2222.0;
  87         int nr_iter = 100;
  88         useconds_t nr_usec = 0;
  89         char *after_first_event_file_path = NULL;
  90         char *before_last_event_file_path = NULL;
  91
  92         if (argc >= 2) {
  93                 /*
  94                  * If nr_iter is negative, do an infinite tracing loop.
  95                  */
  96                 nr_iter = atoi(argv[1]);
  97         }
  98
  99         if (argc >= 3) {
 100                 /* By default, don't wait unless user specifies. */
 101                 nr_usec = atoi(argv[2]);
 102         }
 103
 104         if (argc >= 4) {
 105                 after_first_event_file_path = argv[3];
 106         }
 107
 108         if (argc >= 5) {
 109                 before_last_event_file_path = argv[4];
 110         }
 111
 112         for (i = 0; nr_iter < 0 || i < nr_iter; i++) {
 113                 if (nr_iter >= 0 && i == nr_iter - 1) {
 114                         /*
 115                          * Wait on synchronization before writing last
 116                          * event.
 117                          */
 118                         wait_on_file(before_last_event_file_path);
 119                 }
 120                 netint = htonl(i);
 121                 tracepoint(tp, tptest, i, netint, values, text,
 122                         strlen(text), dbl, flt);
 123
 124                 /*
 125                  * First loop we create the file if asked to indicate
 126                  * that at least one tracepoint has been hit.
 127                  */
 128                 create_file(after_first_event_file_path);
 129                 usleep(nr_usec);
 130         }
 131
 132         return 0;
 133 }