Various additions and fixes.

src/lib9/dirfstat.c

@@ -0,0 +1,29 @@
+#include <u.h>
+#define NOPLAN9DEFINES
+#include <libc.h>
+
+#include <sys/stat.h>
+
+extern int _p9dir(struct stat*, char*, Dir*, char**, char*);
+
+Dir*
+dirfstat(int fd)
+{
+	struct stat st;
+	int nstr;
+	Dir *d;
+	char *str, tmp[100];
+
+	if(fstat(fd, &st) < 0)
+		return nil;
+
+	snprint(tmp, sizeof tmp, "/dev/fd/%d", fd);
+	nstr = _p9dir(&st, tmp, nil, nil, nil);
+	d = mallocz(sizeof(Dir)+nstr, 1);
+	if(d == nil)
+		return nil;
+	str = (char*)&d[1];
+	_p9dir(&st, tmp, d, &str, str+nstr);
+	return d;
+}
+