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From: Peter Wemm <peter@FreeBSD.ORG>
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	Sun, 14 Sep 1997 02:44:35 -0700 (PDT)
Date: Sun, 14 Sep 1997 02:44:35 -0700 (PDT)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-lib@FreeBSD.ORG
Subject: cvs commit: src/lib/libc/net res_send.c
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peter       1997/09/14 02:44:35 PDT

  Modified files:
    lib/libc/net         res_send.c 
  Log:
  Call poll(2) from within the resolver but adapt to older kernels without it
  if necessary.  This removes the need to malloc large fd_set's for selecting
  on high fd's (larger than FD_SETSIZE at libc compile time).
  
  The syscall adaptive stuff only happens on the very first call.  SIGSYS
  is masked, and if the call to poll fails with ENOSYS, then we use select
  for the life of the program.  If poll does not fail with ENOSYS, then we
  always use poll and skip the once-off signal masking gunk.
  
  This may be overkill, but it saved my neck a few times while working on
  multiple different sets of kernel sources, some with poll, some without.
  
  Revision  Changes    Path
  1.19      +68 -26    src/lib/libc/net/res_send.c