Messages in this thread | | | Date | Sat, 21 Oct 2023 11:13:38 +0200 | From | Willy Tarreau <> | Subject | Re: [PATCH] tools/nolibc: Add Linux specific waitpid() flags |
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Hi Thomas,
On Sat, Oct 21, 2023 at 11:00:20AM +0200, Thomas Weißschuh wrote: > Hi, > > Oct 20, 2023 23:57:01 Mark Brown <broonie@kernel.org>: > > > Linux defines a few custom flags for waitpid(), make them available to > > nolibc based programs. > > > > Signed-off-by: Mark Brown <broonie@kernel.org> > > --- > > tools/include/nolibc/types.h | 5 ++++- > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h > > index 8cfc4c860fa4..801ea0bb186e 100644 > > --- a/tools/include/nolibc/types.h > > +++ b/tools/include/nolibc/types.h > > @@ -109,7 +109,10 @@ > > #define WIFSIGNALED(status) ((status) - 1 < 0xff) > > > > /* waitpid() flags */ > > -#define WNOHANG 1 > > +#define WNOHANG 0x00000001 > > +#define __WNOTHREAD 0x20000000 > > +#define __WALL 0x40000000 > > +#define __WCLONE 0x80000000 > > Wouldn't it be easier to include linux/wait.h instead?
That's indeed the trend we should follow whenever possible. We've got caught a few times in the past with build errors depending on the includes ordering due to such redefinitions. I don't know if that's the case for these ones (nor if including linux/wait.h would cause other breakage) but it's worth considering at least.
The difficulty here is that originally nolibc did not *explicitly* depend on UAPI headers, and was supposed to be self-sufficient (that was the main point). Adapting to multiple archs caused the addition of ifdefs all around, then trying to standardize the include file names instead of just "nolibc.h" caused conflicts with programs already including linux/anything.h. Anyway now we depend on linux/lots-of-stuff so I think it's worth continuing in that direction so that we don't replicate the UAPI maintenance effort.
Cheers, Willy
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