Bug#196251: setpgrp() doesn't work as expected

[GOTO Masanori <gotom@debian.or.jp>]

reassign 196251 glibc-doc
severity 196251 minor
retitle 196251 glibc-doc: info should describe about setpgrp() + _BSM_SOURCE.
thanks

At Thu, 05 Jun 2003 19:16:23 +0200,
Robert Millan wrote:
> The Glibc docs say:
> 
>  - Function: int setpgrp (pid_t PID, pid_t PGID)
>      This is the BSD Unix name for `setpgid'.  Both functions do exactly
>      the same thing.
> 
> but that isn't true, see the following test case:
> 
> $ cat test.c
> #include <sys/types.h>
> #include <unistd.h>
> main ()
> {
>   setpgid (0, 0);
>   setpgrp (0, 0);
> }
> $ gcc test.c -o /dev/null
> test.c: In function `main':
> test.c:6: error: too many arguments to function `setpgrp'

You need to compile -D_BSD_SOURCE if you want to use BSD's setpgrp.
In default, glibc uses SYSV style.  But it's good idea to describe
about it.  I'll update glibc-doc.

> I've found this when i hit the kludges in Xfree86 sources to workaround it,
> in the style of:
> 
> #if defined(__linux__) || defined(__GNU__)
> #define setpgrp setpgid
> #endif

I think it's no problem.  However if removing this definition causes
compilation error, it may mean XFree86 needs large update for the
recent library specification.  I expect freedesktop.org can answer
this kind of problem.

Regards,
-- gotom