util: move fork_and_ptrace_attach helper from cr-check

Signed-off-by: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>

3 files changed, 60 insertions, 57 deletions

diff --git a/criu/cr-check.c b/criu/cr-check.c
index 52393cc8b..381184374 100644
--- a/criu/cr-check.c
+++ b/criu/cr-check.c
@@ -537,63 +537,6 @@ static int check_sigqueuinfo(void)
 	return 0;
 }
 
-static pid_t fork_and_ptrace_attach(int (*child_setup)(void))
-{
-	pid_t pid;
-	int sk_pair[2], sk;
-	char c = 0;
-
-	if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair)) {
-		pr_perror("socketpair");
-		return -1;
-	}
-
-	pid = fork();
-	if (pid < 0) {
-		pr_perror("fork");
-		return -1;
-	} else if (pid == 0) {
-		sk = sk_pair[1];
-		close(sk_pair[0]);
-
-		if (child_setup && child_setup() != 0)
-			exit(1);
-
-		if (write(sk, &c, 1) != 1) {
-			pr_perror("write");
-			exit(1);
-		}
-
-		while (1)
-			sleep(1000);
-		exit(1);
-	}
-
-	sk = sk_pair[0];
-	close(sk_pair[1]);
-
-	if (read(sk, &c, 1) != 1) {
-		close(sk);
-		kill(pid, SIGKILL);
-		waitpid(pid, NULL, 0);
-		pr_perror("read");
-		return -1;
-	}
-
-	close(sk);
-
-	if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) == -1) {
-		pr_perror("Unable to ptrace the child");
-		kill(pid, SIGKILL);
-		waitpid(pid, NULL, 0);
-		return -1;
-	}
-
-	waitpid(pid, NULL, 0);
-
-	return pid;
-}
-
 static int check_ptrace_peeksiginfo(void)
 {
 	struct ptrace_peeksiginfo_args arg;
diff --git a/criu/include/util.h b/criu/include/util.h
index 5ccd24722..4e29c079e 100644
--- a/criu/include/util.h
+++ b/criu/include/util.h
@@ -166,6 +166,7 @@ extern int is_anon_link_type(char *link, char *type);
 
 extern int cr_system(int in, int out, int err, char *cmd, char *const argv[], unsigned flags);
 extern int cr_system_userns(int in, int out, int err, char *cmd, char *const argv[], unsigned flags, int userns_pid);
+extern pid_t fork_and_ptrace_attach(int (*child_setup)(void));
 extern int cr_daemon(int nochdir, int noclose, int close_fd);
 extern int status_ready(void);
 extern int is_root_user(void);
diff --git a/criu/util.c b/criu/util.c
index 5c075cd15..40b12bace 100644
--- a/criu/util.c
+++ b/criu/util.c
@@ -660,6 +660,65 @@ out:
 	return ret;
 }
 
+pid_t fork_and_ptrace_attach(int (*child_setup)(void))
+{
+	pid_t pid;
+	int sk_pair[2], sk;
+	char c = 0;
+
+	if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair)) {
+		pr_perror("socketpair");
+		return -1;
+	}
+
+	pid = fork();
+	if (pid < 0) {
+		pr_perror("fork");
+		return -1;
+	}
+
+	if (pid == 0) {
+		sk = sk_pair[1];
+		close(sk_pair[0]);
+
+		if (child_setup && child_setup() != 0)
+			exit(1);
+
+		if (write(sk, &c, 1) != 1) {
+			pr_perror("write");
+			exit(1);
+		}
+
+		while (1)
+			sleep(1000);
+		exit(1);
+	}
+
+	sk = sk_pair[0];
+	close(sk_pair[1]);
+
+	if (read(sk, &c, 1) != 1) {
+		close(sk);
+		kill(pid, SIGKILL);
+		waitpid(pid, NULL, 0);
+		pr_perror("read");
+		return -1;
+	}
+
+	close(sk);
+
+	if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) == -1) {
+		pr_perror("Unable to ptrace the child");
+		kill(pid, SIGKILL);
+		waitpid(pid, NULL, 0);
+		return -1;
+	}
+
+	waitpid(pid, NULL, 0);
+
+	return pid;
+}
+
 int status_ready(void)
 {
 	char c = 0;