Lighttpd

The gthread_aio and posix_aio backends are broken on OS X. OS X doesn't support using /dev/zero file descriptor for anonymous shared memory isn't supported. It results in this error getting repeated when debugging is enabled:

network_posix_aio.c.348: (error) the mmap() failed, no way for a fallback:
connections.c.1336: (trace) (network-subsys sent us a fatal-error)

To avoid this problem I replaced this line in src/network_gthread_aio.c (~ line 101):
c->file.mmap.start = mmap(0, c->file.mmap.length,
PROT_READ | PROT_WRITE, MAP_SHARED, mmap_fd, 0);

With:
c->file.mmap.start = mmap(0, c->file.mmap.length,
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);

Doing the same thing with src/network_posix_aio.c (~ line 348) prevents the error when using that backend.

Obviously this isn't the best way to fix the problem, the /dev/zero fd is still created and this probably breaks the code for other operating systems. Note that MAP_ANON may be called MAP_ANONYMOUS on other OSes.