[LTP] [PATCH] getcpu01: Fix strtoul incorrectly returns 0

[Ping Fang]

get_nodeid() find nodeid by iterate /sys/devices/system/node/nodeX/cpuY.
But there are cpulist and cpumap, which will report 0 in strtoul.
On multi-node numa system, the last iteration nodeX directory mismatch
the cpu0 node id. Then fail the test. The following shows on a 4 node
numa system. The last iteration stopped under /node1. so expected node
id 1. Then failed.

getcpu01.c:98: TINFO: cpu:0, cpu_id:0, de->d_name:node2
getcpu01.c:99: TINFO: dn->d_name:cpulist
getcpu01.c:98: TINFO: cpu:0, cpu_id:0, de->d_name:node0
getcpu01.c:99: TINFO: dn->d_name:cpulist
getcpu01.c:98: TINFO: cpu:0, cpu_id:0, de->d_name:node3
getcpu01.c:99: TINFO: dn->d_name:cpulist
getcpu01.c:98: TINFO: cpu:0, cpu_id:0, de->d_name:node1
getcpu01.c:99: TINFO: dn->d_name:cpulist
getcpu01.c:128: TFAIL: getcpu() returned wrong value expected  node id:1
returned  node id:0, cpu_set:0

Reported-by: Shizhao Chen <shichen@redhat.com>
Signed-off-by: Ping Fang <pifang@redhat.com>
---
 testcases/kernel/syscalls/getcpu/getcpu01.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/getcpu/getcpu01.c b/testcases/kernel/syscalls/getcpu/getcpu01.c
index f6fcc4fc1..9842c8999 100644
--- a/testcases/kernel/syscalls/getcpu/getcpu01.c
+++ b/testcases/kernel/syscalls/getcpu/getcpu01.c
@@ -69,6 +69,7 @@ static unsigned int get_nodeid(unsigned int cpu_id)
 	DIR *directory_parent, *directory_node;
 	struct dirent *de, *dn;
 	char directory_path[PATH_MAX];
+	char *invalid_number;
 	unsigned int cpu;
 	int node_id = 0;
 
@@ -91,7 +92,9 @@ static unsigned int get_nodeid(unsigned int cpu_id)
 			while ((dn = readdir(directory_node)) != NULL) {
 				if (strncmp(dn->d_name, "cpu", 3))
 					continue;
-				cpu = strtoul(dn->d_name + 3, NULL, 0);
+				cpu = strtoul(dn->d_name + 3, &invalid_number, 0);
+				if (strcmp(invalid_number, "\0"))
+					continue;
 				if (cpu == cpu_id) {
 					node_id =
 					    strtoul(de->d_name + 4, NULL, 0);
-- 
2.31.1