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