[PATCH 2/4] cache: use sendfile() instead of a pair of read() + write()

[Sebastian Andrzej Siewior]

sendfile() does the same job and avoids to copy the content into userland
and back. One has to define NO_SENDFILE in case the OS (kernel / libc)
does not supported. It is disabled by default on non-linux environemnts.
According to the glibc, sendfile64() was added in Linux 2.4 (so it has
been there for a while) but after browsing over the mapage of FreeBSD's I
noticed that the prototype is little different.

Signed-off-by: Sebastian Andrzej Siewior <sebastian at breakpoint.cc>
---
 Makefile |  1 +
 cache.c  | 26 +++++++++++++++++++++++++-
 cgit.mk  |  8 ++++++++
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 2dc92df..05b97d7 100644
--- a/Makefile
+++ b/Makefile
@@ -29,6 +29,7 @@ DOC_PDF  = $(patsubst %.txt,%.pdf,$(MAN_TXT))
 # j, z, t. (representing long long int, char, intmax_t, size_t, ptrdiff_t).
 # some C compilers supported these specifiers prior to C99 as an extension.
 #
+# Define HAVE_LINUX_SENDFILE to use sendfile()
 
 #-include config.mak
 
diff --git a/cache.c b/cache.c
index fcd461f..9e7eeb0 100644
--- a/cache.c
+++ b/cache.c
@@ -13,6 +13,9 @@
  *
  */
 
+#ifdef HAVE_LINUX_SENDFILE
+#include <sys/sendfile.h>
+#endif
 #include "cgit.h"
 #include "cache.h"
 #include "html.h"
@@ -30,7 +33,6 @@ struct cache_slot {
 	const char *lock_name;
 	int match;
 	struct stat cache_st;
-	struct stat lock_st;
 	int bufsize;
 	char buf[CACHE_BUFSIZE];
 };
@@ -81,6 +83,23 @@ static int close_slot(struct cache_slot *slot)
 /* Print the content of the active cache slot (but skip the key). */
 static int print_slot(struct cache_slot *slot)
 {
+#ifdef HAVE_LINUX_SENDFILE
+	off_t start_off;
+	int ret;
+
+	start_off = slot->keylen + 1;
+
+	do {
+		ret = sendfile(STDOUT_FILENO, slot->cache_fd, &start_off,
+				slot->cache_st.st_size - start_off);
+		if (ret < 0) {
+			if (errno == EAGAIN || errno == EINTR)
+				continue;
+			return errno;
+		}
+		return 0;
+	} while (1);
+#else
 	ssize_t i, j;
 
 	i = lseek(slot->cache_fd, slot->keylen + 1, SEEK_SET);
@@ -97,6 +116,7 @@ static int print_slot(struct cache_slot *slot)
 		return errno;
 	else
 		return 0;
+#endif
 }
 
 /* Check if the slot has expired */
@@ -188,6 +208,10 @@ static int fill_slot(struct cache_slot *slot)
 	/* Generate cache content */
 	slot->fn();
 
+	/* update stat info */
+	if (fstat(slot->lock_fd, &slot->cache_st))
+		return errno;
+
 	/* Restore stdout */
 	if (dup2(tmp, STDOUT_FILENO) == -1)
 		return errno;
diff --git a/cgit.mk b/cgit.mk
index 056c3f9..3b8b79a 100644
--- a/cgit.mk
+++ b/cgit.mk
@@ -68,6 +68,14 @@ ifeq ($(findstring BSD,$(uname_S)),)
 	CGIT_LIBS += -ldl
 endif
 
+# glibc 2.1+ offers sendfile which the most common C library on Linux
+ifeq ($(uname_S),Linux)
+	HAVE_LINUX_SENDFILE = YesPlease
+endif
+
+ifdef HAVE_LINUX_SENDFILE
+	CGIT_CFLAGS += -DHAVE_LINUX_SENDFILE
+endif
 
 CGIT_OBJ_NAMES += cgit.o
 CGIT_OBJ_NAMES += cache.o
-- 
1.8.5.2