tools/perf/tests/util.c

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <stdlib.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <fcntl.h>
   7 #include "tests.h"
   8 #include "debugfs.h"
   9
  10 int trace_event__id(const char *evname)
  11 {
  12         char *filename;
  13         int err = -1, fd;
  14
  15         if (asprintf(&filename,
  16                      "%s/syscalls/%s/id",
  17                      tracing_events_path, evname) < 0)
  18                 return -1;
  19
  20         fd = open(filename, O_RDONLY);
  21         if (fd >= 0) {
  22                 char id[16];
  23                 if (read(fd, id, sizeof(id)) > 0)
  24                         err = atoi(id);
  25                 close(fd);
  26         }
  27
  28         free(filename);
  29         return err;
  30 }