[core] prefer getxattr() instead of get_attr()

(when lighttpd is built ./configure --with-attr)

configure.ac

@@ -503,6 +503,15 @@ if test "$WITH_ATTR" != no; then
   ])
   AC_SUBST([ATTR_LIB])
 
+  # Linux getxattr
+  AC_CHECK_FUNC([getxattr], [
+    AC_CHECK_HEADERS([sys/xattr.h], [
+      AC_DEFINE([HAVE_XATTR], [1], [Linux extended attributes])
+      AC_DEFINE([HAVE_SYS_XATTR_H], [1])
+      have_xattr=yes
+    ])
+  ])
+
   # (Free)BSD extattr
   AC_CHECK_FUNC([extattr_get_file], [
     AC_CHECK_HEADERS([sys/extattr.h], [

src/CMakeLists.txt

@@ -248,6 +248,8 @@ macro(XCONFIG _package _include_DIR _link_DIR _link_FLAGS _cflags)
 endmacro(XCONFIG _package _include_DIR _link_DIR _link_FLAGS _cflags)
 
 if(WITH_XATTR)
+	check_include_files("sys/types.h;sys/xattr.h" HAVE_SYS_XATTR_H)
+	check_function_exists(getxattr HAVE_XATTR)
 	check_include_files("sys/types.h;attr/attributes.h" HAVE_ATTR_ATTRIBUTES_H)
 	if(HAVE_ATTR_ATTRIBUTES_H)
 		check_library_exists(attr attr_get "" HAVE_XATTR)

src/meson.build

@@ -557,6 +557,16 @@ endif
 
 libattr = []
 if get_option('with_xattr')
+    if compiler.has_function('getxattr',
+		args: defs,
+		prefix: '''
+			#include <sys/types.h>
+			#include <sys/xattr.h>
+		'''
+    )
+	conf_data.set('HAVE_SYS_XATTR_H', true)
+	conf_data.set('HAVE_XATTR', true)
+    else
 	libattr = [ compiler.find_library('attr') ]
 	if not(compiler.has_function('attr_get',
 		args: defs,
@@ -570,6 +580,7 @@ if get_option('with_xattr')
 	endif
 	conf_data.set('HAVE_ATTR_ATTRIBUTES_H', true)
 	conf_data.set('HAVE_XATTR', true)
+    endif
 endif
 
 libz = []

src/stat_cache.c

@@ -15,7 +15,9 @@
 #include <unistd.h>
 #include <fcntl.h>
 
-#ifdef HAVE_ATTR_ATTRIBUTES_H
+#if defined(HAVE_SYS_XATTR_H)
+# include <sys/xattr.h>
+#elif defined(HAVE_ATTR_ATTRIBUTES_H)
 # include <attr/attributes.h>
 #endif
 
@@ -555,10 +557,16 @@ static const char *attrname = "Content-Type";
 static char attrval[128];
 static buffer attrb = { attrval, 0, 0 };
 
-static int stat_cache_attr_get(char *name) {
+static int stat_cache_attr_get(const char *name) {
   #if defined(HAVE_XATTR)
+   #if defined(HAVE_SYS_XATTR_H)
+    ssize_t attrlen;
+    if (0 < (attrlen = getxattr(name, attrname,
+                                attrval, sizeof(attrval)-1)))
+   #else
     int attrlen = sizeof(attrval)-1;
     if (0 == attr_get(name, attrname, attrval, &attrlen, 0))
+   #endif
   #elif defined(HAVE_EXTATTR)
     ssize_t attrlen;
     if (0 < (attrlen = extattr_get_file(name, EXTATTR_NAMESPACE_USER, attrname,