Fix the following warns by adding return check and error handling.
gcc -O2 -Wall -g -I./ -isystem .../tools/testing/selftests/../../../usr/include -Wl,-rpath=./ cs_prctl_test.c -lpthread -o .../tools/testing/selftests/sched/cs_prctl_test
cs_prctl_test.c: In function ‘create_processes’:
cs_prctl_test.c:187:17: warning: ignoring return value of ‘read’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
187 | read(proc[i].pfd[0], &proc[i].thr_tids, sizeof(int) * proc[i].num_threads);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cs_prctl_test.c: In function ‘child_func_process’:
cs_prctl_test.c:159:9: warning: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
159 | write(ca->pfd[1], &ca->thr_tids, sizeof(int) * ca->num_threads);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Shuah Khan <[email protected]>
---
tools/testing/selftests/sched/cs_prctl_test.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/sched/cs_prctl_test.c b/tools/testing/selftests/sched/cs_prctl_test.c
index 8109b17dc764..25e0d95d3713 100644
--- a/tools/testing/selftests/sched/cs_prctl_test.c
+++ b/tools/testing/selftests/sched/cs_prctl_test.c
@@ -27,6 +27,7 @@
#include <sys/prctl.h>
#include <unistd.h>
#include <time.h>
+#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -151,12 +152,17 @@ static void create_threads(int num_threads, int thr_tids[])
static int child_func_process(void *arg)
{
struct child_args *ca = (struct child_args *)arg;
+ int ret;
close(ca->pfd[0]);
create_threads(ca->num_threads, ca->thr_tids);
- write(ca->pfd[1], &ca->thr_tids, sizeof(int) * ca->num_threads);
+ ret = write(ca->pfd[1], &ca->thr_tids, sizeof(int) * ca->num_threads);
+ if (ret == -1)
+ printf("write failed on pfd[%d] - error (%s)\n",
+ ca->pfd[1], strerror(errno));
+
close(ca->pfd[1]);
while (1)
@@ -169,7 +175,7 @@ static unsigned char child_func_process_stack[STACK_SIZE];
void create_processes(int num_processes, int num_threads, struct child_args proc[])
{
pid_t cpid;
- int i;
+ int i, ret;
for (i = 0; i < num_processes; ++i) {
proc[i].num_threads = num_threads;
@@ -184,7 +190,10 @@ void create_processes(int num_processes, int num_threads, struct child_args proc
}
for (i = 0; i < num_processes; ++i) {
- read(proc[i].pfd[0], &proc[i].thr_tids, sizeof(int) * proc[i].num_threads);
+ ret = read(proc[i].pfd[0], &proc[i].thr_tids, sizeof(int) * proc[i].num_threads);
+ if (ret == -1)
+ printf("read failed on proc[%d].pfd[0] error (%s)\n",
+ i, strerror(errno));
close(proc[i].pfd[0]);
}
}
--
2.37.2