cleanup src/linux and src/misc trees, etc.

previously, it was pretty much random which one of these trees a given
function appeared in. they have now been organized into:

src/linux: non-POSIX linux syscalls (possibly shard with other nixen)
src/legacy: various obsolete/legacy functions, mostly wrappers
src/misc: still mostly uncategorized; some misc POSIX, some nonstd
src/crypt: crypt hash functions

further cleanup will be done later.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/legacy/getdtablesize.c b/src/legacy/getdtablesize.c
new file mode 100644
index 00000000..623a6af3
--- /dev/null
+++ b/src/legacy/getdtablesize.c
@@ -0,0 +1,9 @@
+#include <limits.h>
+#include <sys/resource.h>
+
+int getdtablesize(void)
+{
+	struct rlimit rl;
+	getrlimit(RLIMIT_NOFILE, &rl);
+	return rl.rlim_max < INT_MAX ? rl.rlim_max : INT_MAX;
+}