/* Adapted from fish/alloc.c */
static int
parse_size (const char *str, uint64_t estimate, uint64_t *size_rtn)
{
unsigned long long size;
strtol_error xerr;
int plus = 0;
assert (str);
if (str[0] == '+') {
plus = 1;
str++;
}
xerr = xstrtoull (str, NULL, 0, &size, "0kKMGTPEZY");
if (xerr != LONGINT_OK) {
fprintf (stderr,
_("%s: %s: invalid size parameter '%s' (%s returned %u)\n"),
guestfs_int_program_name, "parse_size", str, "xstrtoull", xerr);
return -1;
}
if (plus)
*size_rtn = estimate + size;
else
*size_rtn = size;
return 0;
}
int
parse_size (const char *str, off_t *size_rtn)
{
unsigned long long size;
strtol_error xerr;
xerr = xstrtoull (str, NULL, 0, &size, "0kKMGTPEZY");
if (xerr != LONGINT_OK) {
fprintf (stderr,
_("%s: invalid integer parameter (%s returned %d)\n"),
"parse_size", "xstrtoull", xerr);
return -1;
}
/* XXX 32 bit file offsets, if anyone uses them? GCC should give
* a warning here anyhow.
*/
*size_rtn = size;
return 0;
}
int main(void)
{
struct dirent *de;
unsigned int fd, target_fd;
if (unshare(CLONE_FILES) == -1)
return 1;
/* Wipe fdtable. */
do {
DIR *d;
d = opendir("/proc/self/fd");
if (!d)
return 1;
de = xreaddir(d);
assert(de->d_type == DT_DIR);
assert(streq(de->d_name, "."));
de = xreaddir(d);
assert(de->d_type == DT_DIR);
assert(streq(de->d_name, ".."));
next:
de = xreaddir(d);
if (de) {
unsigned long long fd_ull;
unsigned int fd;
char *end;
assert(de->d_type == DT_LNK);
fd_ull = xstrtoull(de->d_name, &end);
assert(*end == '\0');
assert(fd_ull == (unsigned int)fd_ull);
fd = fd_ull;
if (fd == dirfd(d))
goto next;
close(fd);
}
closedir(d);
} while (de);
/* Now fdtable is clean. */
fd = open("/", O_PATH|O_DIRECTORY);
assert(fd == 0);
test_lookup(fd);
close(fd);
/* Clean again! */
fd = open("/", O_PATH|O_DIRECTORY);
assert(fd == 0);
/* Default RLIMIT_NOFILE-1 */
target_fd = 1023;
while (target_fd > 0) {
if (dup2(fd, target_fd) == target_fd)
break;
target_fd /= 2;
}
assert(target_fd > 0);
close(fd);
test_lookup(target_fd);
close(target_fd);
return 0;
}
