Re: [Libguestfs] [libnbd PATCH v4 2/3] lib/utils: add async-signal-safe assert()

Add an assert() variant that we may call between fork() and exec*(). Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; ---

+void +nbd_internal_fork_safe_assert (int result, const char *file, long line, + const char *func, const char *assertion) +{ + const char *line_out; + char line_buf[32]; + + if (result) + return; + + line_out = nbd_internal_fork_safe_itoa (line, line_buf, sizeof line_buf); + xwritel (STDERR_FILENO, file, ":", line_out, ": ", func, ": Assertion `", + assertion, "' failed.\n", (char *)NULL);