From e1fc085915298edaf9d3ec97bbd87c7ff371a196 Mon Sep 17 00:00:00 2001
From: Juan RP <xtraeme@gmail.com>
Date: Sat, 15 Dec 2012 09:51:05 +0100
Subject: [PATCH] xbps_file_hash: use madvise(2).
---
lib/util_hash.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lib/util_hash.c b/lib/util_hash.c
index b07d157a..f9938299 100644
--- a/lib/util_hash.c
+++ b/lib/util_hash.c
@@ -23,7 +23,9 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
+#define _BSD_SOURCE /* for madvise(2) */
#include <sys/mman.h>
+#undef _BSD_SOURCE
#include <stdio.h>
#include <stdbool.h>
@@ -72,7 +74,7 @@ xbps_file_hash(const char *file)
assert(file != NULL);
- if ((fd = open(file, O_RDONLY)) == -1) {
+ if ((fd = open(file, O_RDONLY|O_CLOEXEC)) == -1) {
free(buf);
return NULL;
}
@@ -105,11 +107,14 @@ xbps_file_hash(const char *file)
if (buf == MAP_FAILED)
return NULL;
+ (void)madvise(buf, mapsize, MADV_SEQUENTIAL);
if (SHA256(buf, st.st_size, digest) == NULL) {
munmap(buf, mapsize);
return NULL;
}
+ (void)madvise(buf, mapsize, MADV_DONTNEED);
munmap(buf, mapsize);
+
digest2string(digest, hash, SHA256_DIGEST_LENGTH);
return strdup(hash);