plan9port/src/lib9/get9root.c

#include <u.h>
#include <libc.h>

char*
get9root(void)
{
	static char *s;

	if(s)
		return s;

	if((s = getenv("PLAN9")) != 0)
		return s;
	s = PLAN9_TARGET;
	return s;
}