fd-perf.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include <asm/unistd.h>
   7
   8 #include "perf.h"
   9 #include "shm.h"
  10 #include "log.h"
  11 #include "sanitise.h"
  12
  13 void open_perf_fds(void)
  14 {
  15         struct syscallrecord* sc;
  16         unsigned int i = 0;
  17
  18         while (i < MAX_PERF_FDS) {
  19                 int fd;
  20
  21                 sanitise_perf_event_open(0);
  22                 sc = &shm->syscall[0];
  23                 fd = syscall(__NR_perf_event_open, sc->a1, sc->a2, sc->a3, sc->a4, sc->a5);
  24                 if (fd != -1) {
  25                         shm->perf_fds[i] = fd;
  26                         output(2, "fd[%d] = perf\n", shm->perf_fds[i]);
  27                         i++;
  28                 } else {
  29                         if (errno == ENOSYS)
  30                                 return;
  31                 }
  32         }
  33 }
  34
  35 int rand_perf_fd(void)
  36 {
  37         return shm->perf_fds[rand() % MAX_PERF_FDS];
  38 }