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-rw-r--r--nscd/grpcache.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/nscd/grpcache.c b/nscd/grpcache.c
index 3f440e9701..fb043152c6 100644
--- a/nscd/grpcache.c
+++ b/nscd/grpcache.c
@@ -32,11 +32,17 @@
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
+#ifdef HAVE_SENDFILE
+# include <sys/sendfile.h>
+#endif
#include <sys/socket.h>
#include <stackinfo.h>
#include "nscd.h"
#include "dbg_log.h"
+#ifdef HAVE_SENDFILE
+# include <kernel-features.h>
+#endif
/* This is the standard reply in case the service is disabled. */
static const gr_response_header disabled =
@@ -294,7 +300,29 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
unnecessarily let the receiver wait. */
assert (fd != -1);
- written = writeall (fd, &dataset->resp, total);
+#ifdef HAVE_SENDFILE
+ if (__builtin_expect (db->mmap_used, 1))
+ {
+ assert (db->wr_fd != -1);
+ assert ((char *) &dataset->resp > (char *) db->data);
+ assert ((char *) &dataset->resp - (char *) db->head
+ + total
+ <= (sizeof (struct database_pers_head)
+ + db->head->module * sizeof (ref_t)
+ + db->head->data_size));
+ off_t off = (char *) &dataset->resp - (char *) db->head;
+ written = sendfile (fd, db->wr_fd, &off, total);
+# ifndef __ASSUME_SENDFILE
+ if (written == -1 && errno == ENOSYS)
+ goto use_write;
+# endif
+ }
+ else
+# ifndef __ASSUME_SENDFILE
+ use_write:
+# endif
+#endif
+ written = writeall (fd, &dataset->resp, total);
}
/* Add the record to the database. But only if it has not been