[Bug 273373] <sys/timerfd.h> fails to build in POSIX mode due to namespace pollution

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273373

            Bug ID: 273373
           Summary: <sys/timerfd.h> fails to build in POSIX mode due to
                    namespace pollution
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jbeich@FreeBSD.org
                CC: jfree@freebsd.org

While timerfd_* isn't part of POSIX consumers may expect to build fine given
epoll-shim, glibc, musl don't error out. Found via x11/mako.

$ cat a.cc
#define _XOPEN_SOURCE 700
#include <sys/timerfd.h>
int main() {}

$ cc a.c
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:49:
In file included from /usr/include/sys/filedesc.h:41:
In file included from /usr/include/sys/lock.h:37:
/usr/include/sys/_lock.h:36:2: error: unknown type name 'u_int'
        u_int   lo_flags;
        ^
/usr/include/sys/_lock.h:37:2: error: unknown type name 'u_int'
        u_int   lo_data;                /* General class specific data. */
        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:49:
In file included from /usr/include/sys/filedesc.h:41:
/usr/include/sys/lock.h:62:2: error: unknown type name 'u_int'
        u_int           lc_flags;
        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:49:
In file included from /usr/include/sys/filedesc.h:43:
/usr/include/sys/priority.h:133:2: error: unknown type name 'u_char'; did you
mean 'char'?
        u_char  pri_class;      /* Scheduling class. */
        ^
/usr/include/sys/priority.h:134:2: error: unknown type name 'u_char'; did you
mean 'char'?
        u_char  pri_level;      /* Normal priority level. */
        ^
/usr/include/sys/priority.h:135:2: error: unknown type name 'u_char'; did you
mean 'char'?
        u_char  pri_native;     /* Priority before propagation. */
        ^
/usr/include/sys/priority.h:136:2: error: unknown type name 'u_char'; did you
mean 'char'?
        u_char  pri_user;       /* User priority based on p_cpu and p_nice. */
        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:49:
/usr/include/sys/filedesc.h:53:2: error: unknown type name 'u_long'; did you
mean 'long'?
        u_long          *fc_ioctls;     /* per-descriptor allowed ioctls */
        ^
/usr/include/sys/filedesc.h:97:2: error: unknown type name 'u_int'
        u_int           pwd_refcount;
        ^
/usr/include/sys/filedesc.h:108:2: error: unknown type name 'u_int'
        u_int           pd_refcount;
        ^
/usr/include/sys/filedesc.h:109:2: error: unknown type name 'u_short'; did you
mean 'short'?
        u_short         pd_cmask;       /* mask for file creation */
        ^
/usr/include/sys/filedesc.h:118:2: error: unknown type name 'u_long'; did you
mean 'long'?
        NDSLOTTYPE *fd_map;             /* bitmap of free fds */
        ^
/usr/include/sys/filedesc.h:86:20: note: expanded from macro 'NDSLOTTYPE'
#define NDSLOTTYPE      u_long
                        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:55:
/usr/include/sys/osd.h:40:2: error: unknown type name 'u_int'
        u_int             osd_nslots;   /* (c) */
        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:57:
/usr/include/sys/rtprio.h:74:2: error: unknown type name 'u_short'; did you
mean 'short'?
        u_short type;                   /* scheduling class */
        ^
/usr/include/sys/rtprio.h:75:2: error: unknown type name 'u_short'; did you
mean 'short'?
        u_short prio;
        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:58:
/usr/include/sys/runq.h:73:54: error: unknown type name 'u_char'; did you mean
'char'?
void    runq_remove_idx(struct runq *, struct thread *, u_char *);
                                                        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:62:
/usr/include/sys/signalvar.h:54:2: error: unknown type name 'sig_t'
        sig_t   ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
        ^
/usr/include/sys/signalvar.h:67:2: error: unknown type name 'u_int'
        u_int   ps_refcnt;
        ^
In file included from a.c:2:
In file included from /usr/include/sys/timerfd.h:33:
In file included from /usr/include/sys/proc.h:70:
/usr/include/sys/ucred.h:98:2: error: unknown type name 'u_int'
        u_int   cr_version;             /* structure layout version */
        ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.

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