From owner-freebsd-current  Sun Oct 22  7: 6:46 2000
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Date: Sun, 22 Oct 2000 10:06:09 -0400 (EDT)
From: Daniel Eischen <eischen@vigrid.com>
To: Andrey Rouskol <anry@sovintel.ru>
Cc: freebsd-current@FreeBSD.ORG
Subject: Re: test from mysql's configure
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On Sun, 22 Oct 2000, Andrey Rouskol wrote:
> 
> Hi there !
> 
> Some days ago I was tring to compile mysql at -current and found that 
> ./configure freezes at 'checking for restartable system calls'. Here is a
> code witch is executed - if you compile it with '-lc_r -lm -lcrypt' it will

It should be using -pthread not -lc_r.

> freeze.
> 
> test.c:
> 
> /* Exit 0 (true) if wait returns something other than -1,
>    i.e. the pid of the child, which means that wait was restarted
>    after getting the signal.  */
> #include <sys/types.h>
> #include <signal.h>
> ucatch (isig) { }
> main () {
>   int i = fork (), status;
>   if (i == 0) { sleep (3); kill (getppid (), SIGINT); sleep (3); exit (0); }
>   signal (SIGINT, ucatch);
>   status = wait(&i);
>   if (status == -1) wait(&i);
>   exit (status == -1);
> }

Yes, I can repeat this problem also.  I haven't figured it out yet, but
it seems like the process signal mask is getting hosed somehow.  If you
modify the test to print out the process signal mask, it mysteriously
works:

#include <sys/types.h>
#include <signal.h>
ucatch (isig) { }
main () {
  int i = fork (), status, mask[20];
  if (i == 0) { sleep (3); kill (getppid (), SIGINT); sleep (3); exit 
(0); }
  _thread_sys_sigprocmask(SIG_SETMASK, NULL, (sigset_t *)mask);
  printf ("Signal mask before installing handler: 0x%x\n", mask[0]);
  signal (SIGINT, ucatch);
  _thread_sys_sigprocmask(SIG_SETMASK, NULL, (sigset_t *)mask);
  printf ("Signal mask after installing handler: 0x%x\n", mask[0]);
  status = wait(&i);
  if (status == -1) wait(&i);
  exit (status == -1);
}

-- 
Dan Eischen


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