assert_se(asprintf(&cmd, "ls -l /proc/"PID_FMT"/fd/%d", getpid(), fd) > 0);
system(cmd);
fd2 = mkostemp_safe(pattern, O_RDWR|O_CLOEXEC);
assert_se(asprintf(&cmd, "ls -l /proc/"PID_FMT"/fd/%d", getpid(), fd) > 0);
system(cmd);
fd2 = mkostemp_safe(pattern, O_RDWR|O_CLOEXEC);