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// Copyright (c) 2011 The Native Client Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// These tests exercise NaCl's sysbrk() system call.
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <sstream>
#include <string>
#include "native_client/src/trusted/service_runtime/include/sys/nacl_syscalls.h"
#include "native_client/tests/syscalls/test.h"
/*
* This is defined by the linker as the address of the end of our data segment.
* That's where the break starts out by default.
*/
extern "C" {
extern char end;
}
namespace {
// Note: these parameters to sysbrk are not supposed to be const.
// The defined error return address.
void* kSysbrkErrorAddress = reinterpret_cast<void*>(-1);
// This is an address outside of the 1Gb address range allowed for NaCl
// modules.
void* kIllegalBreakAddress = reinterpret_cast<void*>(~0U);
// Make sure the current break address is non-0 when using sysbrk().
int TestCurrentBreakAddr() {
START_TEST("TestCurrentBreakAddr");
// Clear errno incase a previous function set it.
errno = 0;
void* break_addr = sysbrk(NULL);
EXPECT(NULL != break_addr);
EXPECT(kSysbrkErrorAddress != break_addr);
EXPECT(0 == errno);
END_TEST();
}
// Try to reset the program's break address to a legitimate value.
int TestSysbrk() {
// Round up to the end of the page that's our last initial data page.
// Then add 10MB for good measure to be out of the way of any allocations
// that might have been done before we got here.
void* const sysbrkBase = reinterpret_cast<void*>
(((reinterpret_cast<uintptr_t>(&end) + 0xffff) & -0x10000) + (10 << 20));
START_TEST("TestSysbrk");
// Clear errno incase a previous function set it.
errno = 0;
void* break_addr = sysbrk(sysbrkBase);
EXPECT(NULL != break_addr);
EXPECT(kSysbrkErrorAddress != break_addr);
EXPECT(sysbrkBase == break_addr);
EXPECT(0 == errno);
END_TEST();
}
// Try to reset the program's break address to something illegal using sysbrk().
// When sysbrk() fails, it is supposed to return the old break address and set
// |errno| "to an appropriate value" (in this case, EINVAL).
int TestIllegalSysbrk() {
START_TEST("TestIllegalSysbrk");
// Clear errno incase a previous function set it.
errno = 0;
void* current_break = sysbrk(NULL);
void* break_addr = sysbrk(kIllegalBreakAddress);
/* sysbrk does not touch errno, only the sbrk wrapper would */
EXPECT(0 == errno);
EXPECT(NULL != break_addr);
EXPECT(current_break == break_addr);
END_TEST();
}
} // namespace
// Run through the complete sequence of sysbrk tests. Sets the exit code to
// the number of failed tests. Exit code 0 means all passed.
int main() {
int fail_count = 0;
fail_count += TestCurrentBreakAddr();
fail_count += TestSysbrk();
fail_count += TestIllegalSysbrk();
return fail_count;
}
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