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authorArnaldo Carvalho de Melo <acme@redhat.com>2013-10-17 23:33:43 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-10-17 23:33:43 +0400
commit97a07f10c38064dea492794c99445f6260afcdc1 (patch)
treebaa4b7832bae42e80cb0f27bde490c73875f1a95 /tools
parent6ef068cb8e77784431b6c80adc49d0b0a6a5df66 (diff)
downloadlinux-97a07f10c38064dea492794c99445f6260afcdc1.tar.xz
perf tools: Introduce filename__read_int helper
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/util.c17
-rw-r--r--tools/perf/util/util.h2
2 files changed, 19 insertions, 0 deletions
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 */