proc_pidinfo()-based closefrom() for OS X

Refactor closefrom() to use a single brute-force close() loop fallback.

Based on patch from likan_999.student@sina.com in bz#3049. ok dtucker@

1 files changed, 3 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 1c35b090b..8c6c4637c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -679,6 +679,9 @@ main() { if (NSVersionOfRunTimeLibrary("System") >= (60 << 16))
         AC_CHECK_LIB([sandbox], [sandbox_apply], [
             SSHDLIBS="$SSHDLIBS -lsandbox"
         ])
+        # proc_pidinfo()-based closefrom() replacement.
+        AC_CHECK_HEADERS([libproc.h])
+        AC_CHECK_FUNCS([proc_pidinfo])
         ;;
 *-*-dragonfly*)
         SSHDLIBS="$SSHDLIBS -lcrypt"