ptrace supports threads

Fujitsu: POSTK_DEBUG_TEMP_FIX_53, POSTK_DEBUG_ARCH_DEP_44
Refs: #771, #1179, #1143
Change-Id: Ie17ece6864f0eeb0c0e550f4e369abb77980a0d0

test/issues/771+1179+1143/C771T001.c

@@ -0,0 +1,63 @@
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+
+volatile char *m;
+
+void *
+thr(void *arg)
+{
+	int rc;
+	char *mm;
+
+	fprintf(stderr, "thread start tid=%d\n", (int)syscall(SYS_gettid));
+	fflush(stderr);
+	errno = 0;
+	mm = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
+		  -1, 0);
+	fprintf(stderr, "mmap m=%p errno=%d\n", mm, errno);
+	fflush(stderr);
+	memset(mm, '\0', 4096);
+	m = mm;
+	*mm = '1';
+	while (*m);
+	rc = munmap(mm, 4096);
+	fprintf(stderr, "munmap rc=%d, errno=%d\n", rc, errno);
+	fflush(stderr);
+	return NULL;
+}
+
+int
+main(int argc, char **argv)
+{
+	pthread_t th;
+	int rc;
+
+	fprintf(stderr, "process start pid=%d\n", getpid());
+	fflush(stderr);
+	rc = pthread_create(&th, NULL, thr, NULL);
+	if (rc) {
+		fprintf(stderr, "pthread_create: %d\n", rc);
+		exit(1);
+	}
+	fprintf(stderr, "pthread_create: %d\n", rc);
+	fflush(stderr);
+	while (!m);
+	fprintf(stderr, "update m=%p\n", m);
+	fflush(stderr);
+	while (!*m);
+	fprintf(stderr, "update *m=%c\n", *m);
+	fflush(stderr);
+	*m = '\0';
+	pthread_join(th, NULL);
+	fprintf(stderr, "main done\n");
+	fflush(stderr);
+	exit(0);
+}