filling out system layer

1 files changed, 14 insertions, 0 deletions

diff --git a/sys/src/mprotect.c b/sys/src/mprotect.c
new file mode 100644
index 0000000..6d20dc1
--- /dev/null
+++ b/sys/src/mprotect.c
@@ -0,0 +1,14 @@
+#include "internal.h"
+
+int
+sys·mprotect(void *addr, uintptr len, int prot)
+{
+    long ret;
+    uintptr beg, end;
+
+    beg = (uintptr)addr & -PAGESIZE;
+    end = (uintptr)(addr + len + PAGESIZE-1) & -PAGESIZE;
+
+    ret = syscall(·MProtect, beg, end-beg, prot);
+    return error(ret);
+}