tags 350884 fixed-upstream
thanks

> struct msgbuf is only defined in linux/msg.h if __USE_GNU is defined,
> i.e. if the programmer has defined _GNU_SOURCE. But the manpage doesn't
> document that.
> 
> #define _GNU_SOURCE
> 
> should be added before
> 
> #include <sys/types.h>
> #include <sys/ipc.h>
> #include <sys/msg.h>
> 
> int msgsnd(int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
> 
> ssize_t  msgrcv(int msqid, struct msgbuf *msgp, size_t msgsz, long msg-
> typ, int msgflg);

Salut Samuel,

The real problem is that the protypes of msgsnd() and msgrcv()
on this page are incorrect (out of date).  The msgp argument 
should be typed as "void *", and the msgbuf structure should be
more clearly marked to indicate that it is a just template for the
kind of object that msgp might point to.  I have made changes
along these lines, as well as various other fixes, and these 
will appear in upstream man-pages 2.23.

Thanks for your report.

Cheers,

Michael

-- 
Michael Kerrisk
maintainer of Linux man pages Sections 2, 3, 4, 5, and 7 

Want to help with man page maintenance?  
Grab the latest tarball at
ftp://ftp.win.tue.nl/pub/linux-local/manpages/, 
read the HOWTOHELP file and grep the source 
files for 'FIXME'.


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