On Mon, 25 Apr 2011, Robert Andersson wrote:
Description:
When including <sys/file.h> with _XOPEN_SOURCE defined to 500 or higher, compila
tion will fail with a message similar to this one (using clang, gcc fails with a
similar message):
In file included from main.c:3:
/usr/include/sys/file.h:161:2: error: unknown type name 'u_int'
u_int xf_flag; /* flags (see fcntl.h) */
u_int is defined in types.h, but it is wrapped in a #if __BSD_VISIBLE.
__BSD_VISIBLE is defined in cdefs.h only if _POSIX_C_SOURCE is not defined (whic
h it is if _XOPEN_SOURCE is defined).
I found the following (short) thread about this problem from 2009:
http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg69469.html
...
Fix:
I'm not sure what the correct solution is. Any one of the following would solve
the problem:
* sys/file.h should not use u_int
* The relevant parts of sys/file.h should be wrapped in #if __BSD_VISIBLE
* The definition of u_int should not be wrapped in #if __BSD_VISIBLE
* _XOPEN_SOURCE >= 500 should not imply _POSIX_C_SOURCE
* _POSIX_C_SOURCE should not stop __BSD_VISIBLE from being defined.
I've used the following fix (the first of the above) for 10 years or
so (it got lost in fixes for mounds of style bugs in <sys/file.h>).
I didn't notice it in connection with _XOPEN_SOURCE, but by general
principles.
% Index: file.h
% ===================================================================
% RCS file: /home/ncvs/src/sys/sys/file.h,v
% retrieving revision 1.65
% diff -u -2 -r1.65 file.h
% --- file.h 19 Jun 2004 11:38:00 -0000 1.65
% +++ file.h 20 Jun 2004 02:11:04 -0000
% @@ -151,5 +142,5 @@
% void *xf_data; /* file descriptor specific data */
% void *xf_vnode; /* vnode pointer */
% - u_int xf_flag; /* flags (see fcntl.h) */
% + unsigned xf_flag; /* flags (see fcntl.h) */
% };
%
Bruce
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