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upstream (git://bpf.tcpdump.org/libpcap). This is a workaround for the BIOCSRTIMEOUT bug in 10.6, 10.6.1, and 10.6.3 that doesn't work for non-integer timeouts. A symptom of being affected by the bug is Nmap haning forever at the first call to pcap_next. 10.6.2 was somehow not affected. This alone still doesn't solve the problem; I still have to make the default --with-libpcap=included for 64-bit OS X. The source comment is informative: /* * XXX - Mac OS X 10.6 mishandles BIOCSRTIMEOUT in 64-bit userland - it * takes, as an argument, a "struct BPF_TIMEVAL", which has 32-bit * tv_sec and tv_usec, rather than a "struct timeval". * * If this platform defines "struct BPF_TIMEVAL", we check whether the * structure size in BIOCSRTIMEOUT is that of a "struct timeval" and, if * not, we use a "struct BPF_TIMEVAL" rather than a "struct timeval". * (That way, if the bug is fixed in a future release, we will still do * the right thing.) */ commit 43acbb77a8e0b3346b574b3e28793de2d6985e69 Author: Guy Harris <guy@alum.mit.edu> Date: Sun Oct 11 11:05:46 2009 -0700 Work around an annoying Snow Leopard BPF bug that causes sub-second timeouts not to work in 64-bit userland code (Snow Leopard's GCC builds 64-bit by default on 64-bit machines).
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).