John Baldwin 93579f6f90 Use kinfo_getfile to implement fdwalk on FreeBSD.
kinfo_getfile() requires a couple of system calls to fetch the list of
open file descriptors.  This can be much cheaper than invoking fstat
on all of the values from 0 to the open file resource limit maximum.

gdb/ChangeLog:

	* common/filestuff.c [HAVE_KINFO_GETFILE]: Include headers.
	(fdwalk) [HAVE_KINFO_GETFILE]: Use kinfo_getfile.
2018-11-30 15:14:18 -08:00
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