Rework the sysconf(3) interaction with aio:

sysconf.c:
  Use 'break' rather than 'goto yesno' in sysconf.c so that we report a '0'
  return value from the kernel sysctl.

vfs_aio.c:
  Make aio reset its configuration parameters to -1 after unloading
  instead of 0.

posix4_mib.c:
  Initialize the aio configuration parameters to -1
  to indicate that it is not loaded.
  Add a facility (p31b_iscfg()) to determine if a posix4 facility has been
  initialized to avoid having to re-order the SYSINITs.
  Use p31b_iscfg() to determine if aio has had a chance to run yet which
  is likely if it is compiled into the kernel and avoid spamming its
  values.
  Introduce a macro P31B_VALID() instead of doing the same comparison over
  and over.

posix4.h:
  Prototype p31b_iscfg().

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/sys/posix4.h b/sys/sys/posix4.h
index e597370..b17e927 100644
--- a/sys/sys/posix4.h
+++ b/sys/sys/posix4.h
@@ -63,6 +63,7 @@ int p31b_proc(struct proc *, pid_t, struct proc **);
 
 void p31b_setcfg(int, int);
 int p31b_getcfg(int);
+int p31b_iscfg(int);
 
 #ifdef _KPOSIX_PRIORITY_SCHEDULING