[LTP] [PATCH v3] syscalls: consolidate getpid02 into getppid02

[Jinseok Kim]

Although named getpid02, the test verifies both getpid() and getppid()
across fork(). Reuse its broader coverage in getppid02 and remove the
duplicated getpid02 test.

While at it, rename proc_id to parent_pid for clarity and use
TST_EXP_EQ_LI() for PID comparisons.

Signed-off-by: Jinseok Kim <always.starving0@gmail.com>
---
Changes in v3:
- Rename proc_id to parent_pid for clarity.
- Use TST_EXP_EQ_LI() for PID comparisons.
- Link to v2: https://lore.kernel.org/ltp/20260729120820.5646-1-always.starving0@gmail.com
---
 runtest/syscalls                              |  1 -
 testcases/kernel/syscalls/getpid/.gitignore   |  1 -
 testcases/kernel/syscalls/getpid/getpid02.c   | 67 -------------------
 testcases/kernel/syscalls/getppid/getppid02.c | 43 ++++++++----
 4 files changed, 31 insertions(+), 81 deletions(-)
 delete mode 100644 testcases/kernel/syscalls/getpid/getpid02.c

diff --git a/runtest/syscalls b/runtest/syscalls
index a38743ded..62a33e3a6 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -517,7 +517,6 @@ getpgid02 getpgid02
 getpgrp01 getpgrp01

 getpid01 getpid01
-getpid02 getpid02

 getppid01 getppid01
 getppid02 getppid02
diff --git a/testcases/kernel/syscalls/getpid/.gitignore b/testcases/kernel/syscalls/getpid/.gitignore
index f44bc9eac..8e7ab0185 100644
--- a/testcases/kernel/syscalls/getpid/.gitignore
+++ b/testcases/kernel/syscalls/getpid/.gitignore
@@ -1,2 +1 @@
 /getpid01
-/getpid02
diff --git a/testcases/kernel/syscalls/getpid/getpid02.c b/testcases/kernel/syscalls/getpid/getpid02.c
deleted file mode 100644
index 08fcd5337..000000000
--- a/testcases/kernel/syscalls/getpid/getpid02.c
+++ /dev/null
@@ -1,67 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (c) International Business Machines  Corp., 2001
- */
-
-/*\
- * Check that:
- *
- * - :manpage:`fork(2)` in parent returns the same pid as
- *   :manpage:`getpid(2)` in child
- * - :manpage:`getppid(2)` in child returns the same pid as
- *   :manpage:`getpid(2)` in parent
- */
-
-#include "tst_test.h"
-
-static pid_t *child_pid;
-
-static void verify_getpid(void)
-{
-	pid_t proc_id;
-	pid_t pid;
-	pid_t pproc_id;
-
-	proc_id = getpid();
-	pid = SAFE_FORK();
-
-	if (pid == 0) {
-		pproc_id = getppid();
-
-		if (pproc_id != proc_id) {
-			tst_res(TFAIL, "child getppid() (%d) != parent getpid() (%d)",
-				pproc_id, proc_id);
-		} else {
-			tst_res(TPASS, "child getppid() == parent getpid() (%d)", proc_id);
-		}
-
-		*child_pid = getpid();
-
-		return;
-	}
-
-	tst_reap_children();
-
-	if (*child_pid != pid)
-		tst_res(TFAIL, "child getpid() (%d) != parent fork() (%d)", *child_pid, pid);
-	else
-		tst_res(TPASS, "child getpid() == parent fork() (%d)", pid);
-}
-
-static void setup(void)
-{
-	child_pid = SAFE_MMAP(NULL, sizeof(pid_t), PROT_READ | PROT_WRITE,
-			      MAP_ANONYMOUS | MAP_SHARED, -1, 0);
-}
-
-static void cleanup(void)
-{
-	SAFE_MUNMAP(child_pid, sizeof(pid_t));
-}
-
-static struct tst_test test = {
-	.forks_child = 1,
-	.setup = setup,
-	.cleanup = cleanup,
-	.test_all = verify_getpid,
-};
diff --git a/testcases/kernel/syscalls/getppid/getppid02.c b/testcases/kernel/syscalls/getppid/getppid02.c
index 7497eba12..b9c773e8d 100644
--- a/testcases/kernel/syscalls/getppid/getppid02.c
+++ b/testcases/kernel/syscalls/getppid/getppid02.c
@@ -4,33 +4,52 @@
  */

 /*\
- * Check that getppid() in child returns the same pid as getpid() in parent.
+ * Check that:
+ *
+ * - :manpage:`fork(2)` in parent returns the same pid as
+ *   :manpage:`getpid(2)` in child
+ * - :manpage:`getppid(2)` in child returns the same pid as
+ *   :manpage:`getpid(2)` in parent
  */

-#include <errno.h>
-
 #include "tst_test.h"

+static pid_t *child_pid;
+
 static void verify_getppid(void)
 {
-	pid_t proc_id;
+	pid_t parent_pid;
 	pid_t pid;
-	pid_t pproc_id;

-	proc_id = getpid();
+	parent_pid = getpid();
 	pid = SAFE_FORK();
+
 	if (pid == 0) {
-		pproc_id = getppid();
+		TST_EXP_EQ_LI(getppid(), parent_pid);

-		if (pproc_id != proc_id)
-			tst_res(TFAIL, "child's ppid(%d) not equal to parent's pid(%d)",
-				pproc_id, proc_id);
-		else
-			tst_res(TPASS, "getppid() returned parent pid (%d)", proc_id);
+		*child_pid = getpid();
+		return;
 	}
+
+	tst_reap_children();
+
+	TST_EXP_EQ_LI(*child_pid, pid);
+}
+
+static void setup(void)
+{
+	child_pid = SAFE_MMAP(NULL, sizeof(pid_t), PROT_READ | PROT_WRITE,
+			      MAP_ANONYMOUS | MAP_SHARED, -1, 0);
+}
+
+static void cleanup(void)
+{
+	SAFE_MUNMAP(child_pid, sizeof(pid_t));
 }

 static struct tst_test test = {
 	.forks_child = 1,
+	.setup = setup,
+	.cleanup = cleanup,
 	.test_all = verify_getppid,
 };
--
2.43.0