From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752627Ab2BQJxJ (ORCPT ); Fri, 17 Feb 2012 04:53:09 -0500 Received: from terminus.zytor.com ([198.137.202.10]:38714 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751097Ab2BQJxG (ORCPT ); Fri, 17 Feb 2012 04:53:06 -0500 Date: Fri, 17 Feb 2012 01:52:22 -0800 From: tip-bot for Jiri Olsa Message-ID: Cc: acme@redhat.com, linux-kernel@vger.kernel.org, paulus@samba.org, hpa@zytor.com, mingo@redhat.com, a.p.zijlstra@chello.nl, jolsa@redhat.com, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org, linux-kernel@vger.kernel.org, acme@redhat.com, a.p.zijlstra@chello.nl, jolsa@redhat.com, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com, mingo@elte.hu In-Reply-To: <1327674868-10486-4-git-send-email-jolsa@redhat.com> References: <1327674868-10486-4-git-send-email-jolsa@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf tools: Add sysfs mountpoint interface Git-Commit-ID: e90fda0635401225ca7c2343bea2f6d279347d10 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.6 (terminus.zytor.com [127.0.0.1]); Fri, 17 Feb 2012 01:52:49 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: e90fda0635401225ca7c2343bea2f6d279347d10 Gitweb: http://git.kernel.org/tip/e90fda0635401225ca7c2343bea2f6d279347d10 Author: Jiri Olsa AuthorDate: Fri, 27 Jan 2012 15:34:22 +0100 Committer: Arnaldo Carvalho de Melo CommitDate: Mon, 13 Feb 2012 23:27:15 -0200 perf tools: Add sysfs mountpoint interface Adding sysfs object to provide sysfs mount information in the same way as debugfs object does. The object provides following function: sysfs_find_mountpoint which returns the sysfs mount mount. Cc: Corey Ashford Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1327674868-10486-4-git-send-email-jolsa@redhat.com Signed-off-by: Jiri Olsa Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Makefile | 2 + tools/perf/util/sysfs.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/sysfs.h | 6 ++++ 3 files changed, 68 insertions(+), 0 deletions(-) diff --git a/tools/perf/Makefile b/tools/perf/Makefile index 8359fa1..e011b50 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -259,6 +259,7 @@ LIB_H += util/callchain.h LIB_H += util/build-id.h LIB_H += util/debug.h LIB_H += util/debugfs.h +LIB_H += util/sysfs.h LIB_H += util/event.h LIB_H += util/evsel.h LIB_H += util/evlist.h @@ -305,6 +306,7 @@ LIB_OBJS += $(OUTPUT)util/build-id.o LIB_OBJS += $(OUTPUT)util/config.o LIB_OBJS += $(OUTPUT)util/ctype.o LIB_OBJS += $(OUTPUT)util/debugfs.o +LIB_OBJS += $(OUTPUT)util/sysfs.o LIB_OBJS += $(OUTPUT)util/environment.o LIB_OBJS += $(OUTPUT)util/event.o LIB_OBJS += $(OUTPUT)util/evlist.o diff --git a/tools/perf/util/sysfs.c b/tools/perf/util/sysfs.c new file mode 100644 index 0000000..48c6902 --- /dev/null +++ b/tools/perf/util/sysfs.c @@ -0,0 +1,60 @@ + +#include "util.h" +#include "sysfs.h" + +static const char * const sysfs_known_mountpoints[] = { + "/sys", + 0, +}; + +static int sysfs_found; +char sysfs_mountpoint[PATH_MAX]; + +static int sysfs_valid_mountpoint(const char *sysfs) +{ + struct statfs st_fs; + + if (statfs(sysfs, &st_fs) < 0) + return -ENOENT; + else if (st_fs.f_type != (long) SYSFS_MAGIC) + return -ENOENT; + + return 0; +} + +const char *sysfs_find_mountpoint(void) +{ + const char * const *ptr; + char type[100]; + FILE *fp; + + if (sysfs_found) + return (const char *) sysfs_mountpoint; + + ptr = sysfs_known_mountpoints; + while (*ptr) { + if (sysfs_valid_mountpoint(*ptr) == 0) { + sysfs_found = 1; + strcpy(sysfs_mountpoint, *ptr); + return sysfs_mountpoint; + } + ptr++; + } + + /* give up and parse /proc/mounts */ + fp = fopen("/proc/mounts", "r"); + if (fp == NULL) + return NULL; + + while (!sysfs_found && + fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n", + sysfs_mountpoint, type) == 2) { + + if (strcmp(type, "sysfs") == 0) + sysfs_found = 1; + } + + fclose(fp); + + return sysfs_found ? sysfs_mountpoint : NULL; +} diff --git a/tools/perf/util/sysfs.h b/tools/perf/util/sysfs.h new file mode 100644 index 0000000..a813b72 --- /dev/null +++ b/tools/perf/util/sysfs.h @@ -0,0 +1,6 @@ +#ifndef __SYSFS_H__ +#define __SYSFS_H__ + +const char *sysfs_find_mountpoint(void); + +#endif /* __DEBUGFS_H__ */