[PATCH 1/3] perf alias: Remove trailing newline when reading sysfs files

Thomas Richter
2018-06-14T11:49:46Z

Remove a trailing newline when reading sysfs file contents
such as /sys/devices/cpum_cf/events/TX_NC_TEND.
This show when verbose option -v is used.

Output before:
tx_nc_tend -> 'cpum_cf'/'event=0x008d
'/

Output after:
tx_nc_tend -> 'cpum_cf'/'event=0x8d'/

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
---
tools/perf/util/pmu.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 7878934ebb23..26c79a9c4142 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -294,7 +294,7 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,

static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
{
- char buf[256];
+ char *cp, buf[256];
int ret;

ret = fread(buf, 1, sizeof(buf), file);
@@ -303,6 +303,11 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI

buf[ret] = 0;

+ /* Remove trailing newline from sysfs file */
+ cp = strrchr(buf, '\n');
+ if (cp)
+ *cp = '\0';
+
return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
NULL, NULL, NULL);
}
--
2.14.3