containers/pidns*: Fix PID checks

Some glibc versions cache the return value of getpid() which can result
in getpid() calls returning parent PID when the process was created
using direct clone() syscall. Use tst_getpid() to get the correct
child PID.

Signed-off-by: Martin Doucha <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>

Author: mdoucha

testcases/kernel/containers/pidns/pidns01.c

@@ -21,7 +21,7 @@ static void child_func(void)
 {
 	pid_t cpid, ppid;
 
-	cpid = getpid();
+	cpid = tst_getpid();
 	ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);

testcases/kernel/containers/pidns/pidns04.c

@@ -17,7 +17,7 @@
 
 static void child_func(void)
 {
-	pid_t cpid = getpid();
+	pid_t cpid = tst_getpid();
 	pid_t ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);

testcases/kernel/containers/pidns/pidns06.c

@@ -16,7 +16,7 @@
 
 static void child_func(int pid)
 {
-	pid_t cpid = getpid();
+	pid_t cpid = tst_getpid();
 	pid_t ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);

testcases/kernel/containers/pidns/pidns10.c

@@ -16,7 +16,7 @@
 
 static void child_func(void)
 {
-	pid_t cpid = getpid();
+	pid_t cpid = tst_getpid();
 	pid_t ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);

testcases/kernel/containers/pidns/pidns12.c

@@ -29,7 +29,7 @@ static void child_func(void)
 {
 	struct sigaction sa;
 
-	TST_EXP_EQ_LI(getpid(), 1);
+	TST_EXP_EQ_LI(tst_getpid(), 1);
 	TST_EXP_EQ_LI(getppid(), 0);
 
 	sa.sa_flags = SA_SIGINFO;

testcases/kernel/containers/pidns/pidns13.c

@@ -42,7 +42,7 @@ static void child_signal_handler(int sig, siginfo_t *si,
 				 void *unused LTP_ATTRIBUTE_UNUSED)
 {
 	tst_res(TWARN, "cinit(pid %d): Caught signal! sig=%d, si_fd=%d, si_code=%d",
-		getpid(), sig, si->si_fd, si->si_code);
+		tst_getpid(), sig, si->si_fd, si->si_code);
 }
 
 static void child_fn(unsigned int cinit_no)
@@ -54,7 +54,7 @@ static void child_fn(unsigned int cinit_no)
 	pid_t pid, ppid;
 	int flags;
 
-	pid = tst_syscall(__NR_getpid);
+	pid = tst_getpid();
 	ppid = getppid();
 	if (pid != CHILD_PID || ppid != PARENT_PID)
 		tst_brk(TBROK, "cinit%u: pidns not created.", cinit_no);

testcases/kernel/containers/pidns/pidns16.c

@@ -30,7 +30,7 @@ static void child_func(void)
 	struct sigaction sa;
 	pid_t cpid, ppid;
 
-	cpid = getpid();
+	cpid = tst_getpid();
 	ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);

testcases/kernel/containers/pidns/pidns17.c

@@ -24,7 +24,7 @@ static void child_func(void)
 	unsigned int i;
 	pid_t cpid, ppid;
 
-	cpid = getpid();
+	cpid = tst_getpid();
 	ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);

testcases/kernel/containers/pidns/pidns20.c

@@ -32,7 +32,7 @@ static void child_func(void)
 	sigset_t newset;
 	pid_t cpid, ppid;
 
-	cpid = getpid();
+	cpid = tst_getpid();
 	ppid = getppid();
 
 	if (cpid != 1 || ppid != 0) {

testcases/kernel/containers/pidns/pidns30.c

@@ -47,7 +47,7 @@ static void child_func(void)
 	struct sigevent notif;
 	mqd_t mqd_child;
 
-	cpid = getpid();
+	cpid = tst_getpid();
 	ppid = getppid();
 
 	TST_EXP_EQ_LI(cpid, 1);