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Commit 97a07f10 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6ef068cb

tools/perf/util/util.c

+17 −0
Original line number Diff line number Diff line
@@ -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;

}

tools/perf/util/util.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */