[11408] in Athena Bugs
decmips 7.6G: is not protected against multiple inclusion
daemon@ATHENA.MIT.EDU (Calvin Clark)
Mon Nov 22 03:52:08 1993
From: Calvin Clark <ckclark@MIT.EDU>
To: bugs@MIT.EDU
Date: Mon, 22 Nov 93 03:51:53 EST
System name: hodge
Type and version: KN01 7.6G (1 update(s) to same version)
Display type: PMAX-MFB
What were you trying to do?
Compile a program which included <sys/socket.h>
more than once.
What's wrong:
I got compiler errors because things like
struct sockaddr were redeclared.
What should have happened:
Most ULTRIX header files are protected against
this by doing something like:
#ifndef _SYS_SOCKET_H
#define _SYS_SOCKET_H
/* code here */
#endif
<sys/socket.h> should do this, too.
Please describe any relevant documentation references:
The ANSI standard actually only requires idempotency
for header files explicitly defined by the standard.
However, it is considered bad manners to neglect
such protection on any system header file.
