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 _GNU_SOURCE
  19 #define _LGPL_SOURCE
  20 #include <assert.h>
  21 #include <arpa/inet.h>
  22 #include <fcntl.h>
  23 #include <stdarg.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/mman.h>
  28 #include <sys/stat.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31 #include <stdbool.h>
  32 #include <signal.h>
  33 #include <poll.h>
  34 #include <errno.h>
  35
  36 #define TRACEPOINT_DEFINE
  37 #include "tp.h"
  38
  39 void create_file(const char *path)
  40 {
  41         static bool file_created = false;
  42         int ret;
  43
  44         if (!path || file_created) {
  45                 return;
  46         }
  47
  48         ret = creat(path, S_IRWXU);
  49         if (ret < 0) {
  50                 fprintf(stderr, "Failed to create file %s\n", path);
  51                 return;
  52         }
  53
  54         (void) close(ret);
  55         file_created = true;
  56 }
  57
  58 static
  59 void wait_on_file(const char *path)
  60 {
  61         if (!path) {
  62                 return;
  63         }
  64         for (;;) {
  65                 int ret;
  66                 struct stat buf;
  67
  68                 ret = stat(path, &buf);
  69                 if (ret == -1 && errno == ENOENT) {
  70                         (void) poll(NULL, 0, 10);       /* 10 ms delay */
  71                         continue;                       /* retry */
  72                 }
  73                 if (ret) {
  74                         perror("stat");
  75                         exit(EXIT_FAILURE);
  76                 }
  77                 break;  /* found */
  78         }
  79 }
  80
  81 int main(int argc, char **argv)
  82 {
  83         unsigned int i, netint;
  84         long values[] = { 1, 2, 3 };
  85         char text[10] = "test";
  86         double dbl = 2.0;
  87         float flt = 2222.0;
  88         int nr_iter = 100;
  89         useconds_t nr_usec = 0;
  90         char *after_first_event_file_path = NULL;
  91         char *before_last_event_file_path = NULL;
  92
  93         if (argc >= 2) {
  94                 /*
  95                  * If nr_iter is negative, do an infinite tracing loop.
  96                  */
  97                 nr_iter = atoi(argv[1]);
  98         }
  99
 100         if (argc >= 3) {
 101                 /* By default, don't wait unless user specifies. */
 102                 nr_usec = atoi(argv[2]);
 103         }
 104
 105         if (argc >= 4) {
 106                 after_first_event_file_path = argv[3];
 107         }
 108
 109         if (argc >= 5) {
 110                 before_last_event_file_path = argv[4];
 111         }
 112
 113         for (i = 0; nr_iter < 0 || i < nr_iter; i++) {
 114                 if (nr_iter >= 0 && i == nr_iter - 1) {
 115                         /*
 116                          * Wait on synchronization before writing last
 117                          * event.
 118                          */
 119                         wait_on_file(before_last_event_file_path);
 120                 }
 121                 netint = htonl(i);
 122                 tracepoint(tp, tptest, i, netint, values, text,
 123                         strlen(text), dbl, flt);
 124
 125                 /*
 126                  * First loop we create the file if asked to indicate
 127                  * that at least one tracepoint has been hit.
 128                  */
 129                 create_file(after_first_event_file_path);
 130                 usleep(nr_usec);
 131         }
 132
 133         return 0;
 134 }