Added BOOST_PROCESS_V2_POSIX_FORCE_DISABLE_CLOSE_RANGE

Implements #378.

Author: klemens-morgenstern

build.jam

@@ -8,6 +8,7 @@ require-b2 5.2 ;
 import feature : feature ;
 
 feature boost.process.fs : boost std : optional propagated ;
+feature boost.process.disable-close-range : on off : optional ;
 
 constant boost_dependencies :
     /boost/algorithm//boost_algorithm

build/Jamfile

@@ -52,6 +52,7 @@ lib boost_process
    : requirements <define>BOOST_PROCESS_SOURCE=1
      <link>shared:<define>BOOST_PROCESS_DYN_LINK=1
      <boost.process.fs>boost:<library>/boost/filesystem//boost_filesystem
+     <boost.process.disable-close-range>on:<define>BOOST_PROCESS_V2_POSIX_FORCE_DISABLE_CLOSE_RANGE=1
      <target-os>windows:<library>shell32
      <target-os>windows:<library>user32
      <target-os>windows:<library>ntdll

src/posix/close_handles.cpp

@@ -44,7 +44,8 @@ int fdwalk(int (*func)(void *, int), void *cd);
 
 #include <linux/version.h>
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,11,0) // kernel has close_range
+// kernel has close_range
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0) && !defined(BOOST_PROCESS_V2_POSIX_FORCE_DISABLE_CLOSE_RANGE)
 
 // version is included by stdlib.h #include <gnu/libc-version.h>
 #if (__GLIBC__ >= 2 && __GLIBC_MINOR__ >= 34) // glibc is compiled with close_range support