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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
void
libtest_free(void *ptr, enum libtest_zero_check zero_checking)
{
struct meminfo *mem;
int saved_errno = errno;
int unmap_err, memory_zeroed;
uint8_t *usable_area;
size_t i;
#ifdef WITH_BACKTRACE
static _Thread_local int inside_free = 0;
#endif
/* free(3) can be called with NULL */
if (!ptr)
return;
/* Optionally print out trace */
#ifdef WITH_BACKTRACE
if (!inside_free && getenv("PRETRACE_FREE")) {
inside_free = 1;
fprintf(stderr, "Deallocating: %p\n", ptr);
libtest_print_backtrace(stderr, NULL, "\tat ", 0u, NULL, NULL);
fflush(stderr);
inside_free = 0;
}
#endif
/* Get the start of the allocation, which
* is where the book-keeping is located */
mem = GET_MEMINFO(ptr);
/* It is illegal to use free(3) on memory allocated with mmap(3)/mmap(2) */
assert(mem->origin != FROM_MMAP_FILE);
assert(mem->origin != FROM_MMAP_ANON);
/* Delist allocation */
if (!libtest_kill_malloc_tracking) {
SPINLOCK(libtest_allocs_list_spinlock);
mem->prev->next = mem->next;
mem->next->prev = mem->prev;
SPINUNLOCK(libtest_allocs_list_spinlock);
}
/* Check memory is zeroed */
if (zero_checking && libtest_expect_zeroed && !mem->accept_leakage) {
usable_area = mem->usable_area;
memory_zeroed = 1;
for (i = 0u; i < mem->usable_alloc_size; i++) {
if (usable_area[i]) {
memory_zeroed = 0;
break;
}
}
assert(memory_zeroed);
}
/* Optionally print out trace */
#ifdef WITH_BACKTRACE
if (!inside_free && getenv("TRACE_MALLOC")) {
inside_free = 1;
fprintf(stderr, "Memory deallocated: %p\n (alloc-size=%zu, real-size=%zu)",
ptr, mem->requested_alloc_size, mem->real_alloc_size);
if (getenv("TRACE_FREE") && !getenv("PRETRACE_FREE"))
libtest_print_backtrace(stderr, NULL, "\tat ", 0u, NULL, NULL);
fflush(stderr);
inside_free = 0;
}
#endif
/* Deallocate memory */
unmap_err = libtest_real_munmap(mem, mem->real_alloc_size);
assert(!unmap_err);
errno = saved_errno;
}
#else
CONST int
main(void)
{
/* Tested via alloc.c */
return 0;
}
#endif
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