2 files changed, 21 insertions, 0 deletions
diff --git a/src/basic/terminal-util.c b/src/basic/terminal-util.c
index cf55263bbf..c5ef5ab0d1 100644
--- a/src/basic/terminal-util.c
+++ b/src/basic/terminal-util.c
@@ -1074,3 +1074,22 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
 
         return 0;
 }
+
+int ptsname_namespace(int pty, char **ret) {
+        int no = -1, r;
+
+        /* Like ptsname(), but doesn't assume that the path is
+         * accessible in the local namespace. */
+
+        r = ioctl(pty, TIOCGPTN, &no);
+        if (r < 0)
+                return -errno;
+
+        if (no < 0)
+                return -EIO;
+
+        if (asprintf(ret, "/dev/pts/%i", no) < 0)
+                return -ENOMEM;
+
+        return 0;
+}
diff --git a/src/basic/terminal-util.h b/src/basic/terminal-util.h
index 188714f228..b9a3809a6c 100644
--- a/src/basic/terminal-util.h
+++ b/src/basic/terminal-util.h
@@ -107,3 +107,5 @@ int get_ctty(pid_t, dev_t *_devnr, char **r);
 
 int getttyname_malloc(int fd, char **r);
 int getttyname_harder(int fd, char **r);
+
+int ptsname_namespace(int pty, char **ret);