libc: Add support for mprotect()

libs/libc/include/luna/syscall.h

@@ -16,6 +16,7 @@
 #define SYS_seek 12
 #define SYS_exec 13
 #define SYS_fcntl 14
+#define SYS_mprotect 15
 
 #ifndef __want_syscalls
 #ifdef __cplusplus

libs/libc/src/sys/mman.cpp

@@ -14,4 +14,9 @@ extern "C"
     {
         return (int)syscall(SYS_munmap, addr, len);
     }
+
+    int mprotect(void* addr, size_t size, int prot)
+    {
+        return (int)syscall(SYS_mprotect, addr, size, prot);
+    }
 }

libs/libc/src/unistd.cpp

@@ -50,6 +50,7 @@ extern "C"
         case SYS_seek:
         case SYS_write:
         case SYS_read:
+        case SYS_mprotect:
         case SYS_mmap: {
             arg arg0 = va_arg(ap, arg);
             arg arg1 = va_arg(ap, arg);