mirror of
https://github.com/jart/cosmopolitan.git
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75 lines
3.6 KiB
C
75 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/cosmo.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/testlib/testlib.h"
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// returns true if byte at memory address is readable
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bool readable(void *addr) {
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return testlib_pokememory(addr);
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}
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// returns true if page is reserved by linux memory manager
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// it can be true for addresses that aren't listed in /proc/PID/maps
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bool occupied(void *addr) {
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int olde = errno;
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char *want = (char *)((uintptr_t)addr & -__pagesize);
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char *got =
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__sys_mmap(want, __pagesize, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE, -1, 0, 0);
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if (got == MAP_FAILED) {
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unassert(errno == IsFreebsd() ? EINVAL : EEXIST);
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errno = olde;
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return true;
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}
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sys_munmap(got, __pagesize);
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return got != want;
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}
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TEST(stack, test) {
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if (IsWindows())
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return;
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void *vstackaddr;
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size_t stacksize = 65536;
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size_t guardsize = 4096;
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unassert(!cosmo_stack_alloc(&stacksize, &guardsize, &vstackaddr));
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char *stackaddr = vstackaddr;
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/* check memory reservation */
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unassert(occupied(stackaddr + stacksize - 1)); // top stack
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unassert(occupied(stackaddr)); // bot stack
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unassert(occupied(stackaddr - 1)); // top guard
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unassert(occupied(stackaddr - guardsize)); // bot guard
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/* check memory accessibility */
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unassert(readable(stackaddr + stacksize - 1)); // top stack
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unassert(readable(stackaddr)); // bot stack
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unassert(!readable(stackaddr - 1)); // top guard
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unassert(!readable(stackaddr - guardsize)); // bot guard
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unassert(!cosmo_stack_free(stackaddr, stacksize, guardsize));
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}
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