From 70524490ee2ea1bbf6cee6c106597b3ac25a3fc2 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 11 Apr 2006 15:51:17 +0200 Subject: [PATCH] splice: add support for sys_tee() Basically an in-kernel implementation of tee, which uses splice and the pipe buffers as an intelligent way to pass data around by reference. Where the user space tee consumes the input and produces a stdout and file output, this syscall merely duplicates the data inside a pipe to another pipe. No data is copied, the output just grabs a reference to the input pipe data. Signed-off-by: Jens Axboe --- include/asm-i386/unistd.h | 3 ++- include/asm-ia64/unistd.h | 3 ++- include/asm-powerpc/unistd.h | 3 ++- include/asm-x86_64/unistd.h | 4 +++- include/linux/pipe_fs_i.h | 1 + include/linux/syscalls.h | 2 ++ 6 files changed, 12 insertions(+), 4 deletions(-) (limited to 'include') diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h index 6a8dd83c350..d81d6cfc1bb 100644 --- a/include/asm-i386/unistd.h +++ b/include/asm-i386/unistd.h @@ -320,8 +320,9 @@ #define __NR_get_robust_list 312 #define __NR_splice 313 #define __NR_sync_file_range 314 +#define __NR_tee 315 -#define NR_syscalls 315 +#define NR_syscalls 316 /* * user-visible error numbers are in the range -1 - -128: see diff --git a/include/asm-ia64/unistd.h b/include/asm-ia64/unistd.h index 1c749acca02..a40ebec6aee 100644 --- a/include/asm-ia64/unistd.h +++ b/include/asm-ia64/unistd.h @@ -289,12 +289,13 @@ #define __NR_set_robust_list 1298 #define __NR_get_robust_list 1299 #define __NR_sync_file_range 1300 +#define __NR_tee 1301 #ifdef __KERNEL__ #include -#define NR_syscalls 277 /* length of syscall table */ +#define NR_syscalls 278 /* length of syscall table */ #define __ARCH_WANT_SYS_RT_SIGACTION diff --git a/include/asm-powerpc/unistd.h b/include/asm-powerpc/unistd.h index 536ba087305..c612f1a6277 100644 --- a/include/asm-powerpc/unistd.h +++ b/include/asm-powerpc/unistd.h @@ -302,8 +302,9 @@ #define __NR_ppoll 281 #define __NR_unshare 282 #define __NR_splice 283 +#define __NR_tee 284 -#define __NR_syscalls 284 +#define __NR_syscalls 285 #ifdef __KERNEL__ #define __NR__exit __NR_exit diff --git a/include/asm-x86_64/unistd.h b/include/asm-x86_64/unistd.h index f21ff2c1e96..d86494e23b6 100644 --- a/include/asm-x86_64/unistd.h +++ b/include/asm-x86_64/unistd.h @@ -611,8 +611,10 @@ __SYSCALL(__NR_set_robust_list, sys_set_robust_list) __SYSCALL(__NR_get_robust_list, sys_get_robust_list) #define __NR_splice 275 __SYSCALL(__NR_splice, sys_splice) +#define __NR_tee 276 +__SYSCALL(__NR_tee, sys_tee) -#define __NR_syscall_max __NR_splice +#define __NR_syscall_max __NR_tee #ifndef __NO_STUBS diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index 123a7c24bc7..ef7f33c0be1 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -21,6 +21,7 @@ struct pipe_buf_operations { void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *); void (*release)(struct pipe_inode_info *, struct pipe_buffer *); int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); + void (*get)(struct pipe_inode_info *, struct pipe_buffer *); }; struct pipe_inode_info { diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index f001bad28d9..d3ebc0e68b2 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -574,6 +574,8 @@ asmlinkage long sys_splice(int fd_in, loff_t __user *off_in, int fd_out, loff_t __user *off_out, size_t len, unsigned int flags); +asmlinkage long sys_tee(int fdin, int fdout, size_t len, unsigned int flags); + asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes, unsigned int flags); -- cgit v1.2.3-18-g5258