From e08decb5992d6511e6896939a4cd9ad157831b78 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 11 Dec 2011 21:37:05 +0000
Subject: Use posix_fadvise to advise about sequential file access.

git-svn-id: http://svn.drobilla.net/serd/trunk@243 490d8e77-9747-427b-9fa3-0b8f29cee8a0
---
 src/reader.c |  9 ++++++++-
 src/serdi.c  |  9 +++++++++
 wscript      | 14 ++++++++++++++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/reader.c b/src/reader.c
index 42c5093f..68b5446d 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -25,6 +25,10 @@
 #include <stdlib.h>
 #include <string.h>
 
+#if defined(HAVE_POSIX_FADVISE) && defined(HAVE_FILENO)
+#   include <fcntl.h>
+#endif
+
 #include "serd_internal.h"
 #include "serd-config.h"
 
@@ -1485,7 +1489,6 @@ serd_reader_get_handle(const SerdReader* reader)
 {
 	return reader->handle;
 }
-
 SERD_API
 void
 serd_reader_add_blank_prefix(SerdReader*    reader,
@@ -1518,6 +1521,10 @@ serd_reader_read_file(SerdReader*    reader,
 		fprintf(stderr, "Error opening file %s (%s)\n", path, strerror(errno));
 		return SERD_ERR_UNKNOWN;
 	}
+#if defined(HAVE_POSIX_FADVISE) && defined(HAVE_FILENO)
+	posix_fadvise(fileno(fd), 0, 0, POSIX_FADV_SEQUENTIAL);
+#endif
+
 	SerdStatus ret = serd_reader_read_file_handle(reader, fd, path);
 	fclose(fd);
 	return ret;
diff --git a/src/serdi.c b/src/serdi.c
index c8bb9242..b3261eac 100644
--- a/src/serdi.c
+++ b/src/serdi.c
@@ -14,11 +14,17 @@
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
+#define _POSIX_C_SOURCE 201112L /* for posix_memalign */
+
 #include <assert.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 
+#if defined(HAVE_POSIX_FADVISE) && defined(HAVE_FILENO)
+#   include <fcntl.h>
+#endif
+
 #include "serd/serd.h"
 
 #include "serd-config.h"
@@ -176,6 +182,9 @@ main(int argc, char** argv)
 				        input, strerror(errno));
 				return 1;
 			}
+#if defined(HAVE_POSIX_FADVISE) && defined(HAVE_FILENO)
+			posix_fadvise(fileno(in_fd), 0, 0, POSIX_FADV_SEQUENTIAL);
+#endif
 		}
 	}
 
diff --git a/wscript b/wscript
index 9bc371d3..9c893f70 100644
--- a/wscript
+++ b/wscript
@@ -66,6 +66,20 @@ def configure(conf):
                cflags='-D_POSIX_C_SOURCE=201112L',
                mandatory=False)
 
+    # Check for posix_fadvise
+    conf.check(function_name='posix_fadvise',
+               header_name='fcntl.h',
+               define_name='HAVE_POSIX_FADVISE',
+               cflags='-D_POSIX_C_SOURCE=201112L',
+               mandatory=False)
+
+    # Check for fileno
+    conf.check(function_name='fileno',
+               header_name='stdio.h',
+               define_name='HAVE_FILENO',
+               cflags='-D_POSIX_C_SOURCE=201112L',
+               mandatory=False)
+
     autowaf.define(conf, 'SERD_VERSION', SERD_VERSION)
     conf.write_config_header('serd-config.h', remove=False)
 
-- 
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