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[PATCH] Introduce sys_splice() system call

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This adds support for the sys_splice system call. Using a pipe as a
transport, it can connect to files or sockets (latter as output only).

From the splice.c comments:

   "splice": joining two ropes together by interweaving their strands.

   This is the "extended pipe" functionality, where a pipe is used as
   an arbitrary in-memory buffer. Think of a pipe as a small kernel
   buffer that you can use to transfer data from one end to the other.

   The traditional unix read/write is extended with a "splice()" operation
   that transfers data buffers to or from a pipe buffer.

   Named by Larry McVoy, original implementation from Linus, extended by
   Jens to support splicing to files and fixing the initial implementation
   bugs.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe
2006-03-30 15:15:30 +02:00
committed by Linus Torvalds
parent 5d4fe2c1ce
commit 5274f052e7
15 changed files with 669 additions and 11 deletions
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3
include/asm-i386/unistd.h
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@@ -318,8 +318,9 @@
#define __NR_unshare 310
#define __NR_set_robust_list 311
#define __NR_get_robust_list 312
#define __NR_sys_splice 313
#define NR_syscalls 313
#define NR_syscalls 314
/*
* user-visible error numbers are in the range -1 - -128: see