From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758141Ab3K1KbJ (ORCPT ); Thu, 28 Nov 2013 05:31:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:28312 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757724Ab3K1KbG (ORCPT ); Thu, 28 Nov 2013 05:31:06 -0500 From: Jiri Olsa To: linux-kernel@vger.kernel.org Cc: Jiri Olsa , Ingo Molnar , Frederic Weisbecker , Peter Zijlstra , Namhyung Kim , Mike Galbraith , David Ahern , Adrian Hunter , Arnaldo Carvalho de Melo Subject: [PATCH 4/7] perf tools: Add writen function Date: Thu, 28 Nov 2013 11:30:16 +0100 Message-Id: <1385634619-8129-5-git-send-email-jolsa@redhat.com> In-Reply-To: <1385634619-8129-1-git-send-email-jolsa@redhat.com> References: <1385634619-8129-1-git-send-email-jolsa@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding 'writen' function as a synchronous wrapper for write syscall with following prototype: ssize_t writen(int fd, void *buf, size_t n) Returns the number of bytes written on success or -1 in case of err. Signed-off-by: Jiri Olsa Cc: Ingo Molnar Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Namhyung Kim Cc: Mike Galbraith Cc: David Ahern Cc: Adrian Hunter Cc: Arnaldo Carvalho de Melo --- tools/perf/util/util.c | 24 +++++++++++++++++++----- tools/perf/util/util.h | 1 + 2 files changed, 20 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 6ea0b4a..b1d5376 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -152,16 +152,14 @@ unsigned long convert_unit(unsigned long value, char *unit) return value; } -/* - * Read exactly 'n' bytes or return an error. - */ -ssize_t readn(int fd, void *buf, size_t n) +static ssize_t ion(bool is_read, int fd, void *buf, size_t n) { void *buf_start = buf; size_t left = n; while (left) { - ssize_t ret = read(fd, buf, left); + ssize_t ret = is_read ? read(fd, buf, left) : + write(fd, buf, left); if (ret <= 0) return ret; @@ -174,6 +172,22 @@ ssize_t readn(int fd, void *buf, size_t n) return n; } +/* + * Read exactly 'n' bytes or return an error. + */ +ssize_t readn(int fd, void *buf, size_t n) +{ + return ion(true, fd, buf, n); +} + +/* + * Write exactly 'n' bytes or return an error. + */ +ssize_t writen(int fd, void *buf, size_t n) +{ + return ion(false, fd, buf, n); +} + size_t hex_width(u64 v) { size_t n = 1; diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 9f6b928..ce0f73d 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -254,6 +254,7 @@ int strtailcmp(const char *s1, const char *s2); char *strxfrchar(char *s, char from, char to); unsigned long convert_unit(unsigned long value, char *unit); ssize_t readn(int fd, void *buf, size_t n); +ssize_t writen(int fd, void *buf, size_t n); struct perf_event_attr; -- 1.8.3.1