[Minor] Add support for readahead(2) call if available

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 816e403bdc6e6993ae3df6e9f4c795ebb50303d1..118f8806fcdad914363afe48549e4622d5da5e0e 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -486,6 +486,11 @@ IF(CMAKE_SYSTEM_NAME STREQUAL "Linux")
                                                  int main (int argc, char **argv) {
                                                        return ((int*)(&recvmmsg))[argc];
                                                  }" HAVE_RECVMMSG)
+       CHECK_C_SOURCE_COMPILES ("#define _GNU_SOURCE
+                                                 #include <fcntl.h>
+                                                 int main (int argc, char **argv) {
+                                                       return ((int*)(&readahead))[argc];
+                                                 }" HAVE_READAHEAD)
 ELSE()
        CHECK_C_SOURCE_RUNS("
        #include <sys/mman.h>

diff --git a/config.h.in b/config.h.in
index f83167463fa0757908e3904e12906772e9f85638..65daa3e2907787e4fed6f0ff28364d4da309fdbe 100644 (file)
--- a/config.h.in
+++ b/config.h.in
@@ -64,6 +64,7 @@
 #cmakedefine HAVE_PTHREAD_PROCESS_SHARED 1
 #cmakedefine HAVE_PWD_H          1
 #cmakedefine HAVE_RDTSC          1
+#cmakedefine HAVE_READAHEAD      1
 #cmakedefine HAVE_READPASSPHRASE_H  1
 #cmakedefine HAVE_RECVMMSG       1
 #cmakedefine HAVE_RUSAGE_SELF    1