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