[MEDIUM] add definitions for Linux kernel splicing
Some older libc don't define the splice() syscall, and some even
define a wrong one. For this reason, we try our best to declare
it correctly. These definitions still work with recent glibc.
diff --git a/src/stream_sock.c b/src/stream_sock.c
index a02b56a..5504369 100644
--- a/src/stream_sock.c
+++ b/src/stream_sock.c
@@ -10,6 +10,7 @@
*
*/
+#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
@@ -33,6 +34,49 @@
#include <proto/task.h>
+/* On recent Linux kernels, the splice() syscall may be used for faster data copy.
+ * But it's not always defined on some OS versions, and it even happens that some
+ * definitions are wrong with some glibc due to an offset bug in syscall().
+ */
+
+#if defined(CONFIG_HAP_LINUX_SPLICE)
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#ifndef SPLICE_F_MOVE
+#define SPLICE_F_MOVE 0x1
+#endif
+
+#ifndef SPLICE_F_NONBLOCK
+#define SPLICE_F_NONBLOCK 0x2
+#endif
+
+#ifndef SPLICE_F_MORE
+#define SPLICE_F_MORE 0x4
+#endif
+
+#ifndef __NR_splice
+#if defined(__powerpc__) || defined(__powerpc64__)
+#define __NR_splice 283
+#elif defined(__sparc__) || defined(__sparc64__)
+#define __NR_splice 232
+#elif defined(__x86_64__)
+#define __NR_splice 275
+#elif defined(__alpha__)
+#define __NR_splice 468
+#elif defined (__i386__)
+#define __NR_splice 313
+#else
+#warning unsupported architecture, guessing __NR_splice=313 like x86...
+#define __NR_splice 313
+#endif /* $arch */
+
+_syscall6(int, splice, int, fdin, loff_t *, off_in, int, fdout, loff_t *, off_out, size_t, len, unsigned long, flags)
+
+#endif /* __NR_splice */
+#endif /* CONFIG_HAP_LINUX_SPLICE */
+
+
/*
* this function is called on a read event from a stream socket.
* It returns 0 if we have a high confidence that we will not be