Add check of mmap64 function and use it when available rather that mmap

There can be issues on 32-bit architectures to mmap 2+GiB file, and to
make this portable between different version of glibc, mmap64 was
prefered over _FILE_OFFSET_BITS

1 files changed, 4 insertions, 0 deletions

diff --git a/buffer.c b/buffer.c
index fcbcba3c..825f6a29 100644
--- a/buffer.c
+++ b/buffer.c
@@ -3080,7 +3080,11 @@ evbuffer_file_segment_materialize(struct evbuffer_file_segment *seg)
 			offset_leftover = offset % page_size;
 			offset_rounded = offset - offset_leftover;
 		}
+#if defined(EVENT__HAVE_MMAP64)
+		mapped = mmap64(NULL, length + offset_leftover,
+#else
 		mapped = mmap(NULL, length + offset_leftover,
+#endif
 		    PROT_READ,
 #ifdef MAP_NOCACHE
 		    MAP_NOCACHE | /* ??? */