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Subject: cygwin 3.6.0 vs. libbsd 0.11.7-3: -lbsd breaks setproctitle()
To: cygwin AT cygwin DOT com
Message-ID: <4250e737-217a-2b55-c6df-8567b283da15@t-online.de>
Date: Wed, 19 Feb 2025 11:14:15 +0100
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From: Christian Franke via Cygwin <cygwin AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
Cc: Christian Franke <Christian DOT Franke AT t-online DOT de>
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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

$ objdump -p spt-bsd.exe | grep setproctitle_init || echo NOT FOUND
NOT FOUND

$ objdump -p spt-bsd.exe | grep -B2 setproctitle
         DLL Name: cygbsd-0.dll
         vma:     Ordinal  Hint  Member-Name  Bound-To
         000080e0  <none>  0034  setproctitle

$ objdump -p spt-nobsd.exe | grep -B14 setproctitle
         DLL Name: cygwin1.dll
         vma:     Ordinal  Hint  Member-Name  Bound-To
         ...
         00008128  <none>  0544  setproctitle


cygbsd-0.dll:setproctitle_init exists but is no longer linked because 
the static inline takes precedence:

/usr/include/bsd/unistd.h:
void setproctitle_init(int argc, char *argv[], char *envp[]);

/usr/include/sys/unistd.h:
static inline void setproctitle_init (int, char *[], char *[]) {}

Conflict is likely introduced by (not present in 3.5.*):
https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=2e7f7b96

-- 
Regards,
Christian


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