logind: make VT numbers unsigned

Fix the whole code to use "unsigned int" for vtnr. 0 is an invalid vtnr so
we don't need negative numbers at all.

Note that most code already assumes it's unsigned so in case there's a
negative vtnr, our code may, under special circumstances, silently break.
So this patch makes sure all sources of vtnrs verify the validity. Also
note that the dbus api already uses unsigned ints.

1 files changed, 7 insertions, 7 deletions

diff --git a/src/login/logind-session.c b/src/login/logind-session.c
index c12683c60c..cd87088456 100644
--- a/src/login/logind-session.c
+++ b/src/login/logind-session.c
@@ -229,7 +229,7 @@ int session_save(Session *s) {
                 fprintf(f, "SERVICE=%s\n", s->service);
 
         if (s->seat && seat_has_vts(s->seat))
-                fprintf(f, "VTNR=%i\n", s->vtnr);
+                fprintf(f, "VTNR=%u\n", s->vtnr);
 
         if (s->leader > 0)
                 fprintf(f, "LEADER=%lu\n", (unsigned long) s->leader);
@@ -343,9 +343,9 @@ int session_load(Session *s) {
         }
 
         if (vtnr && s->seat && seat_has_vts(s->seat)) {
-                int v;
+                unsigned int v;
 
-                k = safe_atoi(vtnr, &v);
+                k = safe_atou(vtnr, &v);
                 if (k >= 0 && v >= 1)
                         s->vtnr = v;
         }
@@ -421,7 +421,7 @@ int session_activate(Session *s) {
 
         /* on seats with VTs, we let VTs manage session-switching */
         if (seat_has_vts(s->seat)) {
-                if (s->vtnr <= 0)
+                if (!s->vtnr)
                         return -ENOTSUP;
 
                 return chvt(s->vtnr);
@@ -981,13 +981,13 @@ int session_kill(Session *s, KillWho who, int signo) {
 static int session_open_vt(Session *s) {
         char path[128];
 
-        if (s->vtnr <= 0)
+        if (!s->vtnr)
                 return -1;
 
         if (s->vtfd >= 0)
                 return s->vtfd;
 
-        sprintf(path, "/dev/tty%d", s->vtnr);
+        sprintf(path, "/dev/tty%u", s->vtnr);
         s->vtfd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
         if (s->vtfd < 0) {
                 log_error("cannot open VT %s of session %s: %m", path, s->id);
@@ -1044,7 +1044,7 @@ void session_mute_vt(Session *s) {
         return;
 
 error:
-        log_error("cannot mute VT %d for session %s (%d/%d)", s->vtnr, s->id, r, errno);
+        log_error("cannot mute VT %u for session %s (%d/%d)", s->vtnr, s->id, r, errno);
         session_restore_vt(s);
 }