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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
struct fd {
int name;
int leakable;
};
static size_t nopened = 0u;
static struct fd *opened = NULL;
static atomic_flag spinlock = ATOMIC_FLAG_INIT;
static int tracking_state = -1;
static int
cmp_fd(const void *av, const void *bv)
{
const struct fd *a = av;
const struct fd *b = bv;
return a->name - b->name;
}
static char *
get_path(int fd)
{
char path[sizeof("/dev/fd/-") + 3u * sizeof(int)];
int pathlen;
char *ret = NULL;
size_t size = 0;
ssize_t r;
pathlen = sprintf(path, "/dev/fd/%i", fd);
assert(pathlen > (int)sizeof("/dev/fd/") - 1);
assert((size_t)pathlen < sizeof(path));
do {
ret = realloc(ret, size += 128u);
assert(ret);
r = readlink(path, ret, size - 1u);
assert(r >= 0);
if (r < 0)
return NULL;
} while ((size_t)r >= size - 2u);
ret[r] = '\0';
return ret;
}
int
libtest_fd_tracking(int action)
{
size_t new_nopened = 0u;
struct fd *new_opened = NULL;
DIR *dir;
struct dirent *f;
int ret = 1, dfd, name, digit;
size_t i, j;
char *path;
int old_tracking_state;
SPINLOCK(spinlock);
old_tracking_state = tracking_state;
tracking_state = action;
SPINUNLOCK(spinlock);
if (old_tracking_state == action)
return 1;
libtest_malloc_internal_usage++;
dir = opendir("/dev/fd/");
assert(dir != NULL);
dfd = dirfd(dir);
next:
while ((f = readdir(dir))) {
name = 0;
for (i = 0u; f->d_name[i]; i++) {
if ('0' > f->d_name[i] || f->d_name[i] > '9')
goto next;
digit = (int)f->d_name[i] - (int)'0';
if (name > (INT_MAX - digit) / 10)
goto next;
name = name * 10 + digit;
}
if (name == dfd)
continue;
new_opened = realloc(new_opened, (new_nopened + 1u) * sizeof(*new_opened));
assert(new_opened);
new_opened[new_nopened].name = name;
new_opened[new_nopened].leakable = action;
new_nopened += 1u;
}
closedir(dir);
qsort(new_opened, new_nopened, sizeof(*new_opened), &cmp_fd);
for (i = j = 0u; i < new_nopened || j < nopened;) {
if (i == new_nopened) {
old_unique:
/* the file has been closed, that's great! */
j++;
} else if (j == nopened) {
new_unique:
if (action < 0) {
ret = 0;
path = get_path(new_opened[i].name);
if (path)
fprintf(stderr, "File descriptor leak: %i (%s)\n", new_opened[i].name, path);
else
fprintf(stderr, "File descriptor leak: %i\n", new_opened[i].name);
free(path);
}
i++;
} else if (new_opened[i].name < opened[j].name) {
goto new_unique;
} else if (new_opened[i].name > opened[j].name) {
goto old_unique;
} else {
new_opened[i].leakable = opened[j].leakable;
i++;
j++;
}
}
if (new_nopened == 0u || action < 0) {
free(new_opened);
new_opened = NULL;
new_nopened = 0u;
}
free(opened);
if (action >= 0) {
opened = new_opened;
nopened = new_nopened;
} else {
opened = NULL;
nopened = 0u;
}
libtest_malloc_internal_usage--;
return ret;
}
#else
int
main(void)
{
SET_UP_ALARM();
return 0;
}
#endif
/* TODO maybe test */
/* TODO maybe attempt to tracking where files are opened */
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