1#include <sys/types.h>
2#include <sys/stat.h>
3#include <fcntl.h>
4#include <time.h>
5#include <unistd.h>
6
7#include "capsicum.h"
8#include "syscalls.h"
9#include "capsicum-test.h"
10
11#ifdef HAVE_SYSCALL
12double RepeatSyscall(int count, int nr, long arg1, long arg2, long arg3) {
13  const clock_t t0 = clock(); // or gettimeofday or whatever
14  for (int ii = 0; ii < count; ii++) {
15    syscall(nr, arg1, arg2, arg3);
16  }
17  const clock_t t1 = clock();
18  return (t1 - t0) / (double)CLOCKS_PER_SEC;
19}
20
21typedef int (*EntryFn)(void);
22
23double CompareSyscall(EntryFn entry_fn, int count, int nr,
24                      long arg1, long arg2, long arg3) {
25  double bare = RepeatSyscall(count, nr, arg1, arg2, arg3);
26  EXPECT_OK(entry_fn());
27  double capmode = RepeatSyscall(count, nr, arg1, arg2, arg3);
28  if (verbose) fprintf(stderr, "%d iterations bare=%fs capmode=%fs ratio=%.2f%%\n",
29                       count, bare, capmode, 100.0*capmode/bare);
30  if (bare==0.0) {
31    if (capmode==0.0) return 1.0;
32    return 999.0;
33  }
34  return capmode/bare;
35}
36
37FORK_TEST(Overhead, GetTid) {
38  EXPECT_GT(10, CompareSyscall(&cap_enter, 10000, __NR_gettid, 0, 0, 0));
39}
40FORK_TEST(Overhead, Seek) {
41  int fd = open("/etc/passwd", O_RDONLY);
42  EXPECT_GT(50, CompareSyscall(&cap_enter, 10000, __NR_lseek, fd, 0, SEEK_SET));
43  close(fd);
44}
45#endif
46