From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Borislav Petkov <bp@suse.de>, David Ahern <dsahern@gmail.com>,
Jiri Olsa <jolsa@kernel.org>,
Milian Wolff <milian.wolff@kdab.com>,
Namhyung Kim <namhyung@kernel.org>,
Wang Nan <wangnan0@huawei.com>
Subject: [PATCH 22/30] tools lib api fs: Add helper to read string from procfs file
Date: Wed, 27 Apr 2016 11:31:04 -0300 [thread overview]
Message-ID: <1461767472-8827-23-git-send-email-acme@kernel.org> (raw)
In-Reply-To: <1461767472-8827-1-git-send-email-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To read things like /proc/self/comm.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ztpkbmseidt0hq2psr46o0h9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/lib/api/fs/fs.c | 13 +++++++++++++
tools/lib/api/fs/fs.h | 2 ++
2 files changed, 15 insertions(+)
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index ef78c22ff44d..08556cf2c70d 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -351,6 +351,19 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep)
return err;
}
+int procfs__read_str(const char *entry, char **buf, size_t *sizep)
+{
+ char path[PATH_MAX];
+ const char *procfs = procfs__mountpoint();
+
+ if (!procfs)
+ return -1;
+
+ snprintf(path, sizeof(path), "%s/%s", procfs, entry);
+
+ return filename__read_str(path, buf, sizep);
+}
+
int sysfs__read_ull(const char *entry, unsigned long long *value)
{
char path[PATH_MAX];
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index 9f6598098dc5..16c9c2ed7c5b 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -29,6 +29,8 @@ int filename__read_int(const char *filename, int *value);
int filename__read_ull(const char *filename, unsigned long long *value);
int filename__read_str(const char *filename, char **buf, size_t *sizep);
+int procfs__read_str(const char *entry, char **buf, size_t *sizep);
+
int sysctl__read_int(const char *sysctl, int *value);
int sysfs__read_int(const char *entry, int *value);
int sysfs__read_ull(const char *entry, unsigned long long *value);
--
2.5.5
next prev parent reply other threads:[~2016-04-27 14:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-27 14:30 [GIT PULL 00/30] perf/core improvements and fixes Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 01/30] perf buildid: Fix off-by-one in write_buildid() Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 02/30] perf trace: Extract evsel contructor from perf_evlist__add_pgfault Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 03/30] perf trace: Make --pf maj/min/all use callchains too Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 04/30] perf script: Fix segfault when printing callchains Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 05/30] perf trace: Make --event honour --min-stack too Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 06/30] perf trace: Make --pf " Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 07/30] perf evlist: Decode perf_event_attr->branch_sample_type Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 08/30] perf tools: Make the x86 clean quiet Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 09/30] tools build: Fix perf_clean target Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 10/30] perf tools: Remove duplicate const qualifier Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 11/30] perf tests: Replace assignment with comparison on assert check Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 12/30] perf bench futex: Simplify wrapper for LOCK_PI Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 13/30] perf intel-pt: Fix off-by-one comparison on maximum code Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 14/30] perf hists: Clear dummy entry accumulated period Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 15/30] perf evlist: Enforce ring buffer reading Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 16/30] perf probe: Close target file on error path Arnaldo Carvalho de Melo
2016-04-27 14:30 ` [PATCH 17/30] perf tools: Add lsdir() helper to read a directory Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 18/30] perf probe: Let probe_file__add_event return 0 if succeeded Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 19/30] perf probe: Set default kprobe group name if it is not given Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 20/30] perf trace: Move perf_flags beautifier to tools/perf/trace/beauty/ Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 21/30] perf trace: Do not beautify the 'pid' parameter as a simple integer Arnaldo Carvalho de Melo
2016-04-27 14:31 ` Arnaldo Carvalho de Melo [this message]
2016-04-27 14:31 ` [PATCH 23/30] perf thread: Introduce method to set comm from /proc/pid/self Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 24/30] perf trace: Read thread's COMM from /proc when not set Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 25/30] perf probe: Fix offline module name missmatch issue Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 26/30] perf probe: Fix module probe issue if no dwarf support Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 27/30] perf tools: Update x86's syscall_64.tbl, adding preadv2 & pwritev2 Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 28/30] perf bench: Remove one more die() call Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 29/30] perf core: Allow setting up max frame stack depth via sysctl Arnaldo Carvalho de Melo
2016-04-27 14:31 ` [PATCH 30/30] perf tools: Set the maximum allowed stack from /proc/sys/kernel/perf_event_max_stack Arnaldo Carvalho de Melo
2016-04-27 15:03 ` [GIT PULL 00/30] perf/core improvements and fixes Ingo Molnar
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