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Subject: Re: cygwin 3.6.0 vs. libbsd 0.11.7-3: -lbsd breaks setproctitle()
To: cygwin AT cygwin DOT com
References: <4250e737-217a-2b55-c6df-8567b283da15 AT t-online DOT de>
 <Z7XMsdPjKyaOrNIQ AT calimero DOT vinschen DOT de>
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Date: Wed, 19 Feb 2025 14:25:33 +0100
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From: Christian Franke via Cygwin <cygwin AT cygwin DOT com>
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Hi Corinna,

Corinna Vinschen via Cygwin wrote:
> Hi Christian,
>
> On Feb 19 11:14, Christian Franke via Cygwin wrote:
>> Testcase:
>>
>> $ uname -r
>> 3.6.0-0.375.ged18acfe8c76.x86_64
>>
>> $ cygcheck -f /usr/include/bsd/unistd.h
>> libbsd-devel-0.11.7-3
>>
>> $ cat spt.c
>> #include <unistd.h>
>>
>> int main(int argc, char **argv, char **envp)
>> {
>>    initsetproctitle(argc, argv, envp);
>>    setproctitle("argc = %d", argc);
>>    sleep(2);
>>    return 0;
>> }
>>
>> $ gcc -o spt-bsdovl -isystem /usr/include/bsd -DLIBBSD_OVERLAY spt.c -l bsd
>>
>> $ gcc -o spt-bsd spt.c -l bsd
>>
>> $ gcc -o spt-nobsd spt.c
>>
>> $ ./spt-bsdovl
>> spt-bsdovl: setproctitle not initialized, please either call
>> setproctitle_init() or link against libbsd-ctor.
>>
>> $ ./spt-bsd
>> spt-bsd: setproctitle not initialized, please either call
>> setproctitle_init() or link against libbsd-ctor.
>>
>> $ ./spt-nobsd & procps -o pid,args -p $!
>> [1] 2750
>>    PID COMMAND
>>   2750 spt-nobsd: argc = 1
> The problem the Cygwin patch was supposed to fix is that the libbsd
> version of setproctitle just doesn't work correctly on Cygwin:
>
> $ uname -r
> 3.5.7-1.x86_64
> $ ./spt-bsdovl & procps -o pid,args -p $!
> [1] 140
>    PID COMMAND
>    140 spt-bsdovl:
>
> The way the include file /usr/include/bsd/unistd.h is designed,
> we could make sure the libbsd version is used, by tweaking
> /usr/include/sys/unistd.h:
>
> diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
> index e62e38d10ccf..732356d6a14e 100644
> --- a/newlib/libc/include/sys/unistd.h
> +++ b/newlib/libc/include/sys/unistd.h
> @@ -212,7 +212,7 @@ int     setpgid (pid_t __pid, pid_t __pgid);
>   #if __SVID_VISIBLE || __XSI_VISIBLE >= 500
>   int     setpgrp (void);
>   #endif
> -#if defined(__CYGWIN__) && __BSD_VISIBLE
> +#if defined(__CYGWIN__) && __BSD_VISIBLE && !defined(LIBBSD_OVERLAY)
>   /* Stub for Linux libbsd compatibility. */
>   #define initsetproctitle(c, a, e) setproctitle_init((c), (a), (e))
>   static inline void setproctitle_init (int, char *[], char *[]) {}
>
> But that still allows to link against a non-working setproctitle.

Yes, and it won't work if bsd/unistd.h is included without 
LIBBSD_OVERLAY which is discouraged but still documented on libbsd(7).


> So I think we rather shouldn't supply the libbsd version of
> setproctitle_init/setproctitle anymore, as soon as cygwin 3.6.0 is
> released.
>
> What do you think?

Makes sense. But then existing programs already using the functions from 
cygbsd-0.dll would no longer start. Perhaps keep the symbols in the DLL 
only for some time?

-- 
Regards,
Christian


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