OpenBSD 6.4-current (GENERIC.MP) #374: Sun Oct 21 00:04:11 MDT 2018
            [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP

I wanted PID_MAX in top/top.c but including the header as documented in
various manual pages as per `man -k in=sys/proc' failed as minimally
reproduced below.

In base there's only^Walmost one user of this marco:

        /usr/src/usr.sbin/lpd/lp.c
        39:#define XXX_PID_MAX 99999
        639:          pid = strtonum(line, 2, XXX_PID_MAX, &errstr);

Can anyone with more insight in this area comment on that? What is
wrong here?

        $ cc -xc -
        #include <sys/types.h>
        #include <sys/proc.h>
        int main() { return 0; }

        In file included from <stdin>:2:
        /usr/include/sys/proc.h:362:21: error: field has incomplete type 
'struct sigaltstack'
                struct  sigaltstack p_sigstk;   /* sp & on stack state variable 
*/
                                    ^
        /usr/include/sys/proc.h:362:9: note: forward declaration of 'struct 
sigaltstack'
                struct  sigaltstack p_sigstk;   /* sp & on stack state variable 
*/
                        ^
        /usr/include/sys/proc.h:374:15: error: field has incomplete type 'union 
sigval'
                union sigval p_sigval;  /* For core dump/debugger XXX */
                             ^
        /usr/include/sys/proc.h:94:7: note: forward declaration of 'union 
sigval'
        union sigval;
              ^
        2 errors generated.

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