fix ioctl _IOR, _IOW, etc macros to avoid signed overflow (2<<30)

[musl] / arch / i386 / bits / ioctl.h

diff --git a/arch/i386/bits/ioctl.h b/arch/i386/bits/ioctl.h
index 336c71c..9d75118 100644 (file)
--- a/arch/i386/bits/ioctl.h
+++ b/arch/i386/bits/ioctl.h
@@ -4,9 +4,9 @@
 #define _IOC_READ  2U
 
 #define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
-#define _IOW(a,b,c) _IOC(1,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(3,(a),(b),sizeof(c))
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define TCGETS         0x5401
 #define TCSETS         0x5402