Commit-ID: 97a07f10c38064dea492794c99445f6260afcdc1 Gitweb: http://git.kernel.org/tip/97a07f10c38064dea492794c99445f6260afcdc1 Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> AuthorDate: Thu, 17 Oct 2013 16:33:43 -0300 Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> CommitDate: Thu, 17 Oct 2013 16:33:43 -0300 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@xxxxxxxxx> Cc: David Ahern <dsahern@xxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Mike Galbraith <efault@xxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Stephane Eranian <eranian@xxxxxxxxxx> Link: http://lkml.kernel.org/n/tip-669q04c5tou5pnt8jtiz6y2r@xxxxxxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> --- 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 8dc8cf3..c25e57b 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 42dfba7..c8f362d 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html