[v2] pidfd: avoid linux/wait.h and sys/wait.h name clashes

Commit Message

Christian Kellner Oct. 15, 2019, 4:55 p.m. UTC

From: Christian Kellner <[e-mail]>

Both linux/wait.h and sys/wait.h contain values for the first argument
of 'waitid' (P_ALL, P_PID, ...).  While the former uses defines the
latter uses an enum. When linux/wait.h is included before sys/wait.h
this will lead to an error, because P_ALL, P_PID, ... will already
have been substituted to 0, 1, ... respectively and this the resulting
code will be 'typedef enum {0, 1, ...'.
Remove 'linux/wait.h' and rename P_PIDFD to avoid a future clash, in
case P_PIDFD gets added to the idtype_t enum in sys/wait.h.

Signed-off-by: Christian Kellner <[e-mail]>
---
 tools/testing/selftests/pidfd/pidfd.h           |  4 ++--
 tools/testing/selftests/pidfd/pidfd_open_test.c |  1 -
 tools/testing/selftests/pidfd/pidfd_poll_test.c |  1 -
 tools/testing/selftests/pidfd/pidfd_wait.c      | 14 +++++++-------
 4 files changed, 9 insertions(+), 11 deletions(-)

Comments

Christian Brauner Oct. 15, 2019, 7:38 p.m. UTC | #1

On Tue Oct 15, 2019 at 6:55 PM Christian Kellner wrote:
> From: Christian Kellner <[e-mail]>
> 
> Both linux/wait.h and sys/wait.h contain values for the first argument
> of 'waitid' (P_ALL, P_PID, ...).  While the former uses defines the
> latter uses an enum. When linux/wait.h is included before sys/wait.h
> this will lead to an error, because P_ALL, P_PID, ... will already
> have been substituted to 0, 1, ... respectively and this the resulting
> code will be 'typedef enum {0, 1, ...'.
> Remove 'linux/wait.h' and rename P_PIDFD to avoid a future clash, in
> case P_PIDFD gets added to the idtype_t enum in sys/wait.h.
> 
> Signed-off-by: Christian Kellner <[e-mail]>

Reviewed-by: Christian Brauner <[e-mail]>

Patch

diff --git a/tools/testing/selftests/pidfd/pidfd.h b/tools/testing/selftests/pidfd/pidfd.h
index c6bc68329f4b..9d5e76bd5466 100644
--- a/tools/testing/selftests/pidfd/pidfd.h
+++ b/tools/testing/selftests/pidfd/pidfd.h
@@ -16,8 +16,8 @@ 
 
 #include "../kselftest.h"
 
-#ifndef P_PIDFD
-#define P_PIDFD 3
+#ifndef __P_PIDFD
+#define __P_PIDFD 3
 #endif
 
 #ifndef CLONE_PIDFD
diff --git a/tools/testing/selftests/pidfd/pidfd_open_test.c b/tools/testing/selftests/pidfd/pidfd_open_test.c
index b9fe75fc3e51..8a59438ccc78 100644
--- a/tools/testing/selftests/pidfd/pidfd_open_test.c
+++ b/tools/testing/selftests/pidfd/pidfd_open_test.c
@@ -6,7 +6,6 @@ 
 #include <inttypes.h>
 #include <limits.h>
 #include <linux/types.h>
-#include <linux/wait.h>
 #include <sched.h>
 #include <signal.h>
 #include <stdbool.h>
diff --git a/tools/testing/selftests/pidfd/pidfd_poll_test.c b/tools/testing/selftests/pidfd/pidfd_poll_test.c
index 4b115444dfe9..610811275357 100644
--- a/tools/testing/selftests/pidfd/pidfd_poll_test.c
+++ b/tools/testing/selftests/pidfd/pidfd_poll_test.c
@@ -3,7 +3,6 @@ 
 #define _GNU_SOURCE
 #include <errno.h>
 #include <linux/types.h>
-#include <linux/wait.h>
 #include <poll.h>
 #include <signal.h>
 #include <stdbool.h>
diff --git a/tools/testing/selftests/pidfd/pidfd_wait.c b/tools/testing/selftests/pidfd/pidfd_wait.c
index 7079f8eef792..7e9170b84b81 100644
--- a/tools/testing/selftests/pidfd/pidfd_wait.c
+++ b/tools/testing/selftests/pidfd/pidfd_wait.c
@@ -54,7 +54,7 @@  static int test_pidfd_wait_simple(void)
 		ksft_exit_fail_msg("%s test: failed to open /proc/self %s\n",
 				   test_name, strerror(errno));
 
-	pid = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
+	pid = sys_waitid(__P_PIDFD, pidfd, &info, WEXITED, NULL);
 	if (pid == 0)
 		ksft_exit_fail_msg(
 			"%s test: succeeded to wait on invalid pidfd %s\n",
@@ -67,7 +67,7 @@  static int test_pidfd_wait_simple(void)
 		ksft_exit_fail_msg("%s test: failed to open /dev/null %s\n",
 				   test_name, strerror(errno));
 
-	pid = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
+	pid = sys_waitid(__P_PIDFD, pidfd, &info, WEXITED, NULL);
 	if (pid == 0)
 		ksft_exit_fail_msg(
 			"%s test: succeeded to wait on invalid pidfd %s\n",
@@ -83,7 +83,7 @@  static int test_pidfd_wait_simple(void)
 	if (pid == 0)
 		exit(EXIT_SUCCESS);
 
-	pid = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
+	pid = sys_waitid(__P_PIDFD, pidfd, &info, WEXITED, NULL);
 	if (pid < 0)
 		ksft_exit_fail_msg(
 			"%s test: failed to wait on process with pid %d and pidfd %d: %s\n",
@@ -145,7 +145,7 @@  static int test_pidfd_wait_states(void)
 		exit(EXIT_SUCCESS);
 	}
 
-	ret = sys_waitid(P_PIDFD, pidfd, &info, WSTOPPED, NULL);
+	ret = sys_waitid(__P_PIDFD, pidfd, &info, WSTOPPED, NULL);
 	if (ret < 0)
 		ksft_exit_fail_msg(
 			"%s test: failed to wait on WSTOPPED process with pid %d and pidfd %d: %s\n",
@@ -175,7 +175,7 @@  static int test_pidfd_wait_states(void)
 			"%s test: failed to send signal to process with pid %d and pidfd %d: %s\n",
 			test_name, parent_tid, pidfd, strerror(errno));
 
-	ret = sys_waitid(P_PIDFD, pidfd, &info, WCONTINUED, NULL);
+	ret = sys_waitid(__P_PIDFD, pidfd, &info, WCONTINUED, NULL);
 	if (ret < 0)
 		ksft_exit_fail_msg(
 			"%s test: failed to wait WCONTINUED on process with pid %d and pidfd %d: %s\n",
@@ -199,7 +199,7 @@  static int test_pidfd_wait_states(void)
 			test_name, info.si_pid, parent_tid, pidfd,
 			strerror(errno));
 
-	ret = sys_waitid(P_PIDFD, pidfd, &info, WUNTRACED, NULL);
+	ret = sys_waitid(__P_PIDFD, pidfd, &info, WUNTRACED, NULL);
 	if (ret < 0)
 		ksft_exit_fail_msg(
 			"%s test: failed to wait on WUNTRACED process with pid %d and pidfd %d: %s\n",
@@ -229,7 +229,7 @@  static int test_pidfd_wait_states(void)
 			"%s test: failed to send SIGKILL to process with pid %d and pidfd %d: %s\n",
 			test_name, parent_tid, pidfd, strerror(errno));
 
-	ret = sys_waitid(P_PIDFD, pidfd, &info, WEXITED, NULL);
+	ret = sys_waitid(__P_PIDFD, pidfd, &info, WEXITED, NULL);
 	if (ret < 0)
 		ksft_exit_fail_msg(
 			"%s test: failed to wait on WEXITED process with pid %d and pidfd %d: %s\n",