From: Arnaldo Carvalho de Melo <[email protected]> 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 <[email protected]> Cc: David Ahern <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
