Mail Archives: cygwin/2001/10/17/10:48:49
David,
Thanks for the heads up. Note that "Sun doesn't do it that way"
isn't a very persuasive argument; "Linux doesn't..." or "SUSv2 says
that..." is more persuasive. Fortunately, you got me curious, and
indeed, SUSv2 agrees with Sun on this issue.
http://www.opengroup.org/onlinepubs/007908799/xsh/semctl.html
Unfortunately, I don't have time to track this down and fix it myself
right now. However, I'd be happy to accept a patch...as long as the
bundled apps were all modified to define semun. This includes
ipc-daemon, as well as semtool, shmtool, and msgtool. And the patch was
verified to work properly...
--Chuck
David wrote:
> Hello,
>
> I couldn't find a separate list for cygutils on
>
> http://www.neuro.gatech.edu/users/cwilson/cygutils/index.html
>
> and I want to point out that including the semum union in sem.h
> makes the package incompatable with sun unix which expects the
> union to be declared in the application program. See below.
>
> I get compiler errors if I include sem.h in a program which
> defines the semun union, and I get compilier prototype errors
> if I try to hand semctl anything other than a union with the
> name semun.
>
> David
>
>
>
> semctl(2) System Calls semctl(2)
>
> NAME
> semctl - semaphore control operations
>
> SYNOPSIS
> #include <sys/types.h>
> #include <sys/ipc.h>
> #include <sys/sem.h>
>
> int semctl(int semid, int semnum, int cmd, ...);
>
> DESCRIPTION
> semctl() provides a variety of semaphore control operations
> as specified by cmd. The fourth argument is optional,
> depending upon the operation requested. If required it is
> of type union semun, which must be explicitly declared by
> the application program.
> union semun {
> int val;
> struct semid_ds *buf;
> ushort *array
> } _a_r_g;
>
> SunOS 5.5.1 Last change: 24 Mar 1994 3
>
>
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