sd-login: add a public accessor for the VT number

The VT number was already part of the DBus API, but was not
exposed in the C API.

3 files changed, 25 insertions, 0 deletions

diff --git a/src/login/libsystemd-login.sym b/src/login/libsystemd-login.sym
index 0720704dbf..54aa91c609 100644
--- a/src/login/libsystemd-login.sym
+++ b/src/login/libsystemd-login.sym
@@ -80,3 +80,8 @@ LIBSYSTEMD_LOGIN_205 {
 global:
         sd_pid_get_slice;
 } LIBSYSTEMD_LOGIN_203;
+
+LIBSYSTEMD_LOGIN_207 {
+global:
+        sd_session_get_vt;
+} LIBSYSTEMD_LOGIN_205;
diff --git a/src/login/sd-login.c b/src/login/sd-login.c
index 06587921cd..8a7838d566 100644
--- a/src/login/sd-login.c
+++ b/src/login/sd-login.c
@@ -347,6 +347,23 @@ _public_ int sd_session_get_tty(const char *session, char **tty) {
         return session_get_string(session, "TTY", tty);
 }
 
+_public_ int sd_session_get_vt(const char *session, unsigned *vtnr) {
+        _cleanup_free_ char *vtnr_string;
+        unsigned u;
+        int r;
+
+        r = session_get_string(session, "VTNr", &vtnr_string);
+        if (r < 0)
+                return r;
+
+        r = safe_atou(vtnr_string, &u);
+        if (r < 0)
+                return r;
+
+        *vtnr = u;
+        return 0;
+}
+
 _public_ int sd_session_get_service(const char *session, char **service) {
         return session_get_string(session, "SERVICE", service);
 }
diff --git a/src/systemd/sd-login.h b/src/systemd/sd-login.h
index e37aeda2bb..c5837f0ca0 100644
--- a/src/systemd/sd-login.h
+++ b/src/systemd/sd-login.h
@@ -124,6 +124,9 @@ int sd_session_get_display(const char *session, char **display);
 /* Determine the TTY of this session. */
 int sd_session_get_tty(const char *session, char **display);
 
+/* Determine the VT number of this session. */
+int sd_session_get_vt(const char *session, unsigned *vtnr);
+
 /* Return active session and user of seat */
 int sd_seat_get_active(const char *seat, char **session, uid_t *uid);