add a cpio implementation to tools directory

cpio utility is a mess in point of portability.
For example NetBSD cpio implementation does not support
userid and groupid changes for the archive. This
feature is required for initramfs filesystem targets.
This cpio is from the Heirloom project.

Fix needed rebuild of tools, when changing targets.

1 files changed, 99 insertions, 0 deletions

diff --git a/tools/cpio/src/sfile.c b/tools/cpio/src/sfile.c
new file mode 100644
index 000000000..089d85fdf
--- /dev/null
+++ b/tools/cpio/src/sfile.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2003 Gunnar Ritter
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute
+ * it freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ *
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ *
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+/*	Sccsid @(#)sfile.c	1.9 (gritter) 6/7/04	*/
+
+#ifdef	__linux__
+#undef	_FILE_OFFSET_BITS
+
+#include	<sys/types.h>
+#include	<sys/sendfile.h>
+#include	<sys/stat.h>
+#include	<unistd.h>
+#include	<limits.h>
+#include	<errno.h>
+#include	"sfile.h"
+
+long long
+sfile(int dfd, int sfd, mode_t mode, long long count)
+{
+	static int	enosys, einval, success;
+	off_t	offset;
+	ssize_t	sent, total;
+	extern void	writerr(void *, int, int);
+	/*
+	 * A process is not interruptible while executing a sendfile()
+	 * system call. So it is not advisable to to send an entire
+	 * file with one call; it is sent in parts so signals can
+	 * be delivered in between.
+	 */
+	const ssize_t	chunk = 196608;
+
+	/*
+	 * If a previous call returned ENOSYS, the operating system does
+	 * not support sendfile() at all and it makes no sense to try it
+	 * again.
+	 *
+	 * If a previous call returned EINVAL and there was no successful
+	 * call yet, it is very likely that this is a permanent error
+	 * condition (on Linux 2.6.0-test4, sendfile() may be used for
+	 * socket targets only; older versions don't support tmpfs as
+	 * source file system etc.).
+	 */
+	if (enosys || !success && einval ||
+			(mode&S_IFMT) != S_IFREG || count > SSIZE_MAX)
+		return 0;
+	offset = lseek(sfd, 0, SEEK_CUR);
+	sent = 0, total = 0;
+	while (count > 0 && (sent = sendfile(dfd, sfd, &offset,
+					count > chunk ? chunk : count)) > 0) {
+		count -= sent, total += sent;
+	}
+	if (total && lseek(sfd, offset, SEEK_SET) == (off_t)-1)
+		return -1;
+	if (count == 0 || sent == 0) {
+		success = 1;
+		return total;
+	}
+	switch (errno) {
+	case ENOSYS:
+		enosys = 1;
+		return 0;
+	case EINVAL:
+		einval = 1;
+		return 0;
+	case ENOMEM:
+		return 0;
+	default:
+		writerr(NULL, count > chunk ? chunk : count, 0);
+		return -1;
+	}
+}
+#else	/* !__linux__ */
+#include	<sys/types.h>
+
+/*ARGSUSED*/
+long long
+sfile(int dfd, int sfd, mode_t mode, long long count)
+{
+	return 0;
+}
+#endif	/* __linux__ */