106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
#include "std.hpp"
|
|
#include "tap.hpp"
|
|
#include "buffer/paged.hpp"
|
|
#include "debug.hpp"
|
|
#include "except.hpp"
|
|
#include "posix/except.hpp"
|
|
|
|
#include <signal.h>
|
|
#include <setjmp.h>
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
sigjmp_buf fault_jmp;
|
|
|
|
__attribute__((no_sanitize_address))
|
|
bool
|
|
has_fault
|
|
(const volatile char* addr)
|
|
{
|
|
if (sigsetjmp (fault_jmp, 1) == 0) {
|
|
*addr;
|
|
return false;
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
static bool fault_seen;
|
|
static void *fault_address;
|
|
|
|
__attribute__((no_sanitize_address))
|
|
void
|
|
segv_handler (int num, siginfo_t *info, void *cookie)
|
|
{
|
|
CHECK_EQ (num, SIGSEGV);
|
|
|
|
(void)num;
|
|
(void)cookie;
|
|
|
|
fault_seen = true;
|
|
fault_address = info->si_addr;
|
|
|
|
siglongjmp (fault_jmp, SIGSEGV);
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
int
|
|
main (void)
|
|
{
|
|
cruft::TAP::logger tap;
|
|
|
|
|
|
#if 0
|
|
// setup a trap to record SEGV events
|
|
struct sigaction newhandler {};
|
|
newhandler.sa_sigaction = segv_handler;
|
|
newhandler.sa_flags = SA_SIGINFO;
|
|
|
|
cruft::posix::error::try_call (
|
|
sigaction, SIGSEGV, &newhandler, nullptr
|
|
);
|
|
|
|
// initialise a partially unmapped buffer. the tests assume that the
|
|
// window is substantially less than half the capacity (so that probing
|
|
// the centre doesn't trigger a mapping overlapping the end).
|
|
constexpr size_t CAPACITY = 16 * 1024 * 1024;
|
|
|
|
cruft::buffer::paged buffer (CAPACITY);
|
|
|
|
typedef decltype(buffer)::value_type value_type;
|
|
const value_type *first = buffer.begin ();
|
|
const value_type *last = buffer.end () - 1;
|
|
const value_type *centre = buffer.begin () + buffer.capacity () / 2;
|
|
const value_type *window = centre + buffer.window () - 1;
|
|
|
|
// ensure correct initial mappings
|
|
tap.expect (!has_fault (first), "first is initially valid");
|
|
tap.expect ( has_fault (last), "last is intially invalid");
|
|
|
|
// allocate half the buffer and check mappings
|
|
buffer.commit ({ first, last });
|
|
|
|
tap.expect (!has_fault (first), "first remains valid after commit");
|
|
tap.expect (!has_fault (centre), "centre is valid after partial commit");
|
|
tap.expect (!has_fault (window), "centre window is valid after partial commit");
|
|
tap.expect ( has_fault (last), "last is invalid after partial commit");
|
|
|
|
// allocate the entire buffer and check the last address
|
|
buffer.access (const_cast<value_type*> (last));
|
|
|
|
tap.expect (!has_fault (last), "last is valid after total commit");
|
|
|
|
// unmap the buffer and check centre and last are invalid
|
|
buffer.access (const_cast<value_type*> (first));
|
|
|
|
tap.expect (!has_fault (first), "first value remains valid after release");
|
|
tap.expect ( has_fault (centre), "centre is invalid after release");
|
|
tap.expect ( has_fault (last), "last is invalid after release");
|
|
#endif
|
|
|
|
return tap.status ();
|
|
}
|