Merge pull request #11538 from NixOS/detect-close_range

Use close_range when available

configure.ac

@@ -86,7 +86,7 @@ static char buf[1024];]],
 AC_LANG_POP(C++)
 
 
-AC_CHECK_FUNCS([statvfs pipe2])
+AC_CHECK_FUNCS([statvfs pipe2 close_range])
 
 
 # Check for lutimes, optionally used for changing the mtime of

src/libutil/meson.build

@@ -28,6 +28,7 @@ subdir('build-utils-meson/subprojects')
 # HAVE_LUTIMES 1`. The `#define` is unconditional, 0 for not found and 1
 # for found. One therefore uses it with `#if` not `#ifdef`.
 check_funcs = [
+  'close_range',
   # Optionally used for changing the mtime of symlinks.
   'lutimes',
   # Optionally used for creating pipes on Unix

src/libutil/unix/file-descriptor.cc

@@ -121,10 +121,13 @@ void Pipe::create()
 //////////////////////////////////////////////////////////////////////
 
 #if __linux__ || __FreeBSD__
-// In future we can use a syscall wrapper, but at the moment musl and older glibc version don't support it.
 static int unix_close_range(unsigned int first, unsigned int last, int flags)
 {
+#if !HAVE_CLOSE_RANGE
     return syscall(SYS_close_range, first, last, (unsigned int)flags);
+#else
+    return close_range(first, last, flags);
+#endif
 }
 #endif