fallocate

1 files changed, 15 insertions, 0 deletions

diff --git a/libeio.m4 b/libeio.m4
index 32b81c2..08a0422 100644
--- a/libeio.m4
+++ b/libeio.m4
@@ -123,6 +123,21 @@ int main (void)
 ],ac_cv_sync_file_range=yes,ac_cv_sync_file_range=no)])
 test $ac_cv_sync_file_range = yes && AC_DEFINE(HAVE_SYNC_FILE_RANGE, 1, sync_file_range(2) is available)
 
+AC_CACHE_CHECK(for fallocate, ac_cv_fallocate, [AC_LINK_IFELSE([
+#include <fcntl.h>
+int main (void)
+{
+   int fd = 0;
+   int mode = FALLOC_FL_KEEP_SIZE;
+   off_t offset = 1;
+   off_t len = 1;
+   int res;
+   res = fallocate (fd, mode, offset, len);
+   return 0;
+}
+],ac_cv_fallocate=yes,ac_cv_fallocate=no)])
+test $ac_cv_fallocate = yes && AC_DEFINE(HAVE_FALLOCATE, 1, fallocate(2) is available)
+
 dnl #############################################################################
 dnl # these checks exist for the benefit of IO::AIO