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-rw-r--r--tools/testing/selftests/powerpc/ptrace/child.h139
1 files changed, 139 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/ptrace/child.h b/tools/testing/selftests/powerpc/ptrace/child.h
new file mode 100644
index 000000000000..d7275b7b33dc
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/child.h
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Helper functions to sync execution between parent and child processes.
+ *
+ * Copyright 2018, Thiago Jung Bauermann, IBM Corporation.
+ */
+#include <stdio.h>
+#include <stdbool.h>
+#include <semaphore.h>
+
+/*
+ * Information in a shared memory location for synchronization between child and
+ * parent.
+ */
+struct child_sync {
+ /* The parent waits on this semaphore. */
+ sem_t sem_parent;
+
+ /* If true, the child should give up as well. */
+ bool parent_gave_up;
+
+ /* The child waits on this semaphore. */
+ sem_t sem_child;
+
+ /* If true, the parent should give up as well. */
+ bool child_gave_up;
+};
+
+#define CHILD_FAIL_IF(x, sync) \
+ do { \
+ if (x) { \
+ fprintf(stderr, \
+ "[FAIL] Test FAILED on line %d\n", __LINE__); \
+ (sync)->child_gave_up = true; \
+ prod_parent(sync); \
+ return 1; \
+ } \
+ } while (0)
+
+#define PARENT_FAIL_IF(x, sync) \
+ do { \
+ if (x) { \
+ fprintf(stderr, \
+ "[FAIL] Test FAILED on line %d\n", __LINE__); \
+ (sync)->parent_gave_up = true; \
+ prod_child(sync); \
+ return 1; \
+ } \
+ } while (0)
+
+#define PARENT_SKIP_IF_UNSUPPORTED(x, sync) \
+ do { \
+ if ((x) == -1 && (errno == ENODEV || errno == EINVAL)) { \
+ (sync)->parent_gave_up = true; \
+ prod_child(sync); \
+ SKIP_IF(1); \
+ } \
+ } while (0)
+
+int init_child_sync(struct child_sync *sync)
+{
+ int ret;
+
+ ret = sem_init(&sync->sem_parent, 1, 0);
+ if (ret) {
+ perror("Semaphore initialization failed");
+ return 1;
+ }
+
+ ret = sem_init(&sync->sem_child, 1, 0);
+ if (ret) {
+ perror("Semaphore initialization failed");
+ return 1;
+ }
+
+ return 0;
+}
+
+void destroy_child_sync(struct child_sync *sync)
+{
+ sem_destroy(&sync->sem_parent);
+ sem_destroy(&sync->sem_child);
+}
+
+int wait_child(struct child_sync *sync)
+{
+ int ret;
+
+ /* Wait until the child prods us. */
+ ret = sem_wait(&sync->sem_parent);
+ if (ret) {
+ perror("Error waiting for child");
+ return 1;
+ }
+
+ return sync->child_gave_up;
+}
+
+int prod_child(struct child_sync *sync)
+{
+ int ret;
+
+ /* Unblock the child now. */
+ ret = sem_post(&sync->sem_child);
+ if (ret) {
+ perror("Error prodding child");
+ return 1;
+ }
+
+ return 0;
+}
+
+int wait_parent(struct child_sync *sync)
+{
+ int ret;
+
+ /* Wait until the parent prods us. */
+ ret = sem_wait(&sync->sem_child);
+ if (ret) {
+ perror("Error waiting for parent");
+ return 1;
+ }
+
+ return sync->parent_gave_up;
+}
+
+int prod_parent(struct child_sync *sync)
+{
+ int ret;
+
+ /* Unblock the parent now. */
+ ret = sem_post(&sync->sem_parent);
+ if (ret) {
+ perror("Error prodding parent");
+ return 1;
+ }
+
+ return 0;
+}