46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
|
#include <sys/types.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include "capsicum.h"
|
||
|
|
#include "syscalls.h"
|
||
|
|
#include "capsicum-test.h"
|
||
|
|
|
||
|
|
#ifdef HAVE_SYSCALL
|
||
|
|
double RepeatSyscall(int count, int nr, long arg1, long arg2, long arg3) {
|
||
|
|
const clock_t t0 = clock(); // or gettimeofday or whatever
|
||
|
|
for (int ii = 0; ii < count; ii++) {
|
||
|
|
syscall(nr, arg1, arg2, arg3);
|
||
|
|
}
|
||
|
|
const clock_t t1 = clock();
|
||
|
|
return (t1 - t0) / (double)CLOCKS_PER_SEC;
|
||
|
|
}
|
||
|
|
|
||
|
|
typedef int (*EntryFn)(void);
|
||
|
|
|
||
|
|
double CompareSyscall(EntryFn entry_fn, int count, int nr,
|
||
|
|
long arg1, long arg2, long arg3) {
|
||
|
|
double bare = RepeatSyscall(count, nr, arg1, arg2, arg3);
|
||
|
|
EXPECT_OK(entry_fn());
|
||
|
|
double capmode = RepeatSyscall(count, nr, arg1, arg2, arg3);
|
||
|
|
if (verbose) fprintf(stderr, "%d iterations bare=%fs capmode=%fs ratio=%.2f%%\n",
|
||
|
|
count, bare, capmode, 100.0*capmode/bare);
|
||
|
|
if (bare==0.0) {
|
||
|
|
if (capmode==0.0) return 1.0;
|
||
|
|
return 999.0;
|
||
|
|
}
|
||
|
|
return capmode/bare;
|
||
|
|
}
|
||
|
|
|
||
|
|
FORK_TEST(Overhead, GetTid) {
|
||
|
|
EXPECT_GT(10, CompareSyscall(&cap_enter, 10000, __NR_gettid, 0, 0, 0));
|
||
|
|
}
|
||
|
|
FORK_TEST(Overhead, Seek) {
|
||
|
|
int fd = open("/etc/passwd", O_RDONLY);
|
||
|
|
EXPECT_GT(50, CompareSyscall(&cap_enter, 10000, __NR_lseek, fd, 0, SEEK_SET));
|
||
|
|
close(fd);
|
||
|
|
}
|
||
|
|
#endif
|