Import sources from 2011-03-30 iso image

1 files changed, 27 insertions, 0 deletions

diff --git a/sys/src/libc/9sys/iounit.c b/sys/src/libc/9sys/iounit.c
new file mode 100755
index 000000000..194b17173
--- /dev/null
+++ b/sys/src/libc/9sys/iounit.c
@@ -0,0 +1,27 @@
+#include <u.h>
+#include <libc.h>
+
+/*
+ * Format:
+  3 r  M    4 (0000000000457def 11 00)   8192      512 /rc/lib/rcmain
+ */
+
+int
+iounit(int fd)
+{
+	int i, cfd;
+	char buf[128], *args[10];
+
+	snprint(buf, sizeof buf, "#d/%dctl", fd);
+	cfd = open(buf, OREAD);
+	if(cfd < 0)
+		return 0;
+	i = read(cfd, buf, sizeof buf-1);
+	close(cfd);
+	if(i <= 0)
+		return 0;
+	buf[i] = '\0';
+	if(tokenize(buf, args, nelem(args)) != nelem(args))
+		return 0;
+	return atoi(args[7]);
+}