Hi Suresh,
>This patch attempts to add splice writes support. In essence, it just
>calls generic_file_splice_write() after doing a little sanity check.
>This would allow LTTng users that are using NFS to store trace data.
>There could be more applications that could be benefitted too.
>
>I have tested this using the Jens' test program and have found no
>real issues. The test program is inlined below:
>
>/*
> * splice-out.c: Splice stdout to file
> */
>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <fcntl.h>
>
>#define SPLICE_SIZE (64*1024)
>
>int main(int argc, char *argv[])
>{
> int fd;
>
> if (argc < 2) {
> printf("%s: outfile\n", argv[0]);
> return 1;
> }
>
> fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
> if (fd < 0) {
> perror("open");
> return 1;
> }
>
> do {
> int ret = splice(STDIN_FILENO, NULL, fd, NULL, SPLICE_SIZE, 0);
>
> if (ret < 0) {
> perror("splice");
> break;
> } else if (ret < SPLICE_SIZE)
> break;
> } while (1);
>
> close(fd);
> return 0;
>}
>
>Compile with -D _GNU_SOURCE and do something like:
> echo "some stuff" | ./splice-out <outfile>
>
>
I picked up this test program written by you and ported this to LTP
under GPL. If you do not have any objection(s), can we contribute this
to LTP ? The following patch will do exactly that.
Original-Author: Suresh Jayaraman <[email protected]>
Ported-To-LTP:By: Manas K Nayak <[email protected]>
---
--- ltp-full-20090331.orig/testcases/kernel/syscalls/splice/splice02.c
1970-01-01 05:30:00.000000000 +0530
+++ ltp-full-20090331/testcases/kernel/syscalls/splice/splice02.c
2009-04-13 16:04:21.000000000 +0530
@@ -0,0 +1,145 @@
+/******************************************************************************/
+/* Copyright (c) Suresh Jayaraman <[email protected]>, 2009
*/
+/*
*/
+/* LKML Reference: http://lkml.org/lkml/2009/4/2/55
*/
+/*
*/
+/* This program is free software; you can redistribute it and/or modify
*/
+/* it under the terms of the GNU General Public License as published by
*/
+/* the Free Software Foundation; either version 2 of the License, or
*/
+/* (at your option) any later version.
*/
+/*
*/
+/* This program is distributed in the hope that it will be useful,
*/
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of
*/
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
*/
+/* the GNU General Public License for more details.
*/
+/*
*/
+/* You should have received a copy of the GNU General Public License
*/
+/* along with this program; if not, write to the Free Software
*/
+/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+/*
*/
+/******************************************************************************/
+/******************************************************************************/
+/*
*/
+/* File: splice02.c
*/
+/*
*/
+/* Description: This tests the splice() syscall
*/
+/*
*/
+/* Usage: <for command-line>
*/
+/* echo "Test splice()" > <outfile>; splice02 <outfile>
*/
+/*
*/
+/* Total Tests: 1
*/
+/*
*/
+/* Test Name: splice02 */
+/* History: Porting from Crackerjack to LTP is done by
*/
+/* Manas Kumar Nayak [email protected]>
*/
+/******************************************************************************/
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+
+/* Harness Specific Include Files. */
+#include "test.h"
+#include "usctest.h"
+#include "linux_syscall_numbers.h"
+
+/* Extern Global Variables */
+extern int Tst_count; /* counter for tst_xxx routines. */
+extern char *TESTDIR; /* temporary dir created by tst_tmpdir() */
+
+/* Global Variables */
+char *TCID = "splice02"; /* Test program identifier.*/
+int testno;
+int TST_TOTAL = 1; /* total number of tests in this file.
*/
+
+/* Extern Global Functions */
+/******************************************************************************/
+/*
*/
+/* Function: cleanup
*/
+/*
*/
+/* Description: Performs all one time clean up for this test on successful
*/
+/* completion, premature exit or failure. Closes all temporary
*/
+/* files, removes all temporary directories exits the test with
*/
+/* appropriate return code by calling tst_exit() function.
*/
+/*
*/
+/* Input: None.
*/
+/*
*/
+/* Output: None.
*/
+/*
*/
+/* Return: On failure - Exits calling tst_exit(). Non '0' return code.
*/
+/* On success - Exits calling tst_exit(). With '0' return code.
*/
+/*
*/
+/******************************************************************************/
+extern void cleanup() {
+ /* Remove tmp dir and all files in it */
+ TEST_CLEANUP;
+ tst_rmdir();
+
+ /* Exit with appropriate return code. */
+ tst_exit();
+}
+
+/* Local Functions */
+/******************************************************************************/
+/*
*/
+/* Function: setup
*/
+/*
*/
+/* Description: Performs all one time setup for this test. This function is
*/
+/* typically used to capture signals, create temporary dirs
*/
+/* and temporary files that may be used in the course of this
*/
+/* test.
*/
+/*
*/
+/* Input: None.
*/
+/*
*/
+/* Output: None.
*/
+/*
*/
+/* Return: On failure - Exits by calling cleanup().
*/
+/* On success - returns 0.
*/
+/*
*/
+/******************************************************************************/
+void setup() {
+ /* Capture signals if any */
+ /* Create temporary directories */
+ TEST_PAUSE;
+ tst_tmpdir();
+}
+
+#define SPLICE_SIZE (64*1024)
+
+int main(int ac, char **av) {
+ int fd = 0;
+ int ret = 0;
+
+ setup();
+
+ if (ac < 2 ) {
+ tst_resm(TFAIL, "%s failed - Usage: %s outfile", TCID, av[0]);
+ tst_exit();
+ }
+ fd=open(av[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
+ if(fd < 0 ) {
+ tst_resm(TFAIL, "%s failed - errno = %d : %s", TCID, TEST_ERRNO,
strerror(TEST_ERRNO));
+ cleanup();
+ tst_exit();
+ }
+
+ do {
+ ret = splice(STDIN_FILENO, NULL, fd, NULL, SPLICE_SIZE, 0);
+ if (ret < 0) {
+ tst_resm(TFAIL, "%s failed - errno = %d : %s",TCID, TEST_ERRNO,
strerror(TEST_ERRNO));
+ cleanup();
+ tst_exit();
+ } else
+ if (ret < SPLICE_SIZE){
+ cleanup();
+ tst_exit();
+ }
+ } while(1);
+
+ close(fd);
+ tst_resm(TPASS, "splice() system call Passed");
+ tst_exit();
+}
+
--- ltp-full-20090331.orig/runtest/syscalls 2009-04-13 15:12:15.000000000
+0530
+++ ltp-full-20090331/runtest/syscalls 2009-04-13 16:10:26.000000000 +0530
@@ -1030,6 +1030,8 @@ sockioctl01 sockioctl01
#splice test
splice01 splice01
+splice02 echo "Test splice02()" > splice02-temp; splice02 splice02-temp
+
tee01 tee01
stat01 stat01
---
Regards--
Manas
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