From: Arnaldo Carvalho de Melo <acme@infradead.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>,
David Ahern <dsahern@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Jiri Olsa <jolsa@redhat.com>, Mike Galbraith <efault@gmx.de>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@google.com>
Subject: [PATCH 06/26] perf tools: Introduce filename__read_int helper
Date: Tue, 22 Oct 2013 11:28:14 -0300 [thread overview]
Message-ID: <1382452114-1243-7-git-send-email-acme@infradead.org> (raw)
In-Reply-To: <1382452114-1243-1-git-send-email-acme@infradead.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Just opens a file and calls atoi() in at most its first 64 bytes.
To read things like /proc/sys/kernel/perf_event_paranoid.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-669q04c5tou5pnt8jtiz6y2r@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/util.c | 17 +++++++++++++++++
tools/perf/util/util.h | 2 ++
2 files changed, 19 insertions(+)
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 8dc8cf39f4ed..c25e57b3acb2 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -394,3 +394,20 @@ unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
return (unsigned long) -1;
}
+
+int filename__read_int(const char *filename, int *value)
+{
+ char line[64];
+ int fd = open(filename, O_RDONLY), err = -1;
+
+ if (fd < 0)
+ return -1;
+
+ if (read(fd, line, sizeof(line)) > 0) {
+ *value = atoi(line);
+ err = 0;
+ }
+
+ close(fd);
+ return err;
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 42dfba70fbfc..c8f362daba87 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -305,4 +305,6 @@ struct dso;
char *get_srcline(struct dso *dso, unsigned long addr);
void free_srcline(char *srcline);
+
+int filename__read_int(const char *filename, int *value);
#endif /* GIT_COMPAT_UTIL_H */
--
1.8.1.4
next prev parent reply other threads:[~2013-10-22 14:34 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-22 14:28 [GIT PULL 00/26] perf/core improvements and fixes Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 01/26] perf scripting perl: Fix build error on Fedora 12 Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 02/26] perf trace: Split fd -> pathname array handling Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 03/26] perf trace: Use vfs_getname hook if available Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 04/26] perf trace: Improve event processing exit Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 05/26] perf evlist: Introduce perf_evlist__strerror_tp method Arnaldo Carvalho de Melo
2013-10-22 14:28 ` Arnaldo Carvalho de Melo [this message]
2013-10-22 14:28 ` [PATCH 07/26] perf trace: Improve messages related to /proc/sys/kernel/perf_event_paranoid Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 08/26] perf evsel: Add missing 'mmap2' from debug print Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 09/26] perf evsel: Add missing decrement in id sample parsing Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 10/26] perf record: Improve write_output error message Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 11/26] perf session: Add missing sample flush for piped events Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 12/26] perf session: Add missing members to perf_event__attr_swap() Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 13/26] perf evlist: Fix 32-bit build error Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 14/26] perf tools: Fix test_on_exit for 32-bit build Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 15/26] perf tools: Fix bench/numa.c " Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 16/26] perf evlist: Fix perf_evlist__mmap comments Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 17/26] perf evlist: Factor out duplicated mmap code Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 18/26] perf script: Print addr by default for BTS Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 19/26] perf list: Show error if tracepoints not available Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 20/26] perf callchain: Convert children list to rbtree Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 21/26] perf tools: Compare dso's also when comparing symbols Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 22/26] perf tools: Add data object to handle perf data file Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 23/26] perf tools: Add perf_data_file__open interface to data object Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 24/26] perf session: Separating data file properties from session Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 25/26] perf report: Add --max-stack option to limit callchain stack scan Arnaldo Carvalho de Melo
2013-10-22 14:28 ` [PATCH 26/26] perf top: " Arnaldo Carvalho de Melo
2013-10-23 7:48 ` [GIT PULL 00/26] perf/core improvements and fixes Ingo Molnar
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