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logind-session: generalize EIO handling for {restore,leave}_vt

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Replaces #28949
This commit is contained in:
Mike Yuan 2023-08-28 22:33:33 +08:00
parent a8d5378a88
commit 93041c6010
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GPG Key ID: 417471C0A40F58B3
1 changed files with 17 additions and 30 deletions
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47
src/login/logind-session.c
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@ -1290,7 +1290,8 @@ int session_kill(Session *s, KillWho who, int signo) {
return manager_kill_unit(s->manager, s->scope, who, signo, NULL);
}
static int session_open_vt(Session *s) {
static int session_open_vt(Session *s, bool reopen) {
_cleanup_close_ int fd = -EBADF;
char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)];
assert(s);
@ -1298,14 +1299,16 @@ static int session_open_vt(Session *s) {
if (s->vtnr < 1)
return -ENODEV;
if (s->vtfd >= 0)
if (!reopen && s->vtfd >= 0)
return s->vtfd;
sprintf(path, "/dev/tty%u", s->vtnr);
s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
if (s->vtfd < 0)
return log_error_errno(s->vtfd, "Cannot open VT %s of session %s: %m", path, s->id);
fd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
if (fd < 0)
return log_error_errno(fd, "Cannot open VT %s of session %s: %m", path, s->id);
close_and_replace(s->vtfd, fd);
return s->vtfd;
}
@ -1318,7 +1321,7 @@ static int session_prepare_vt(Session *s) {
if (s->vtnr < 1)
return 0;
vt = session_open_vt(s);
vt = session_open_vt(s, /* reopen = */ false);
if (vt < 0)
return vt;
@ -1377,23 +1380,17 @@ static void session_restore_vt(Session *s) {
r = vt_restore(s->vtfd);
if (r == -EIO) {
int vt, old_fd;
/* It might happen if the controlling process exited before or while we were
* restoring the VT as it would leave the old file-descriptor in a hung-up
* state. In this case let's retry with a fresh handle to the virtual terminal. */
/* We do a little dance to avoid having the terminal be available
* for reuse before we've cleaned it up. */
old_fd = TAKE_FD(s->vtfd);
vt = session_open_vt(s);
safe_close(old_fd);
if (vt >= 0)
r = vt_restore(vt);
int fd = session_open_vt(s, /* reopen = */ true);
if (fd >= 0)
r = vt_restore(fd);
}
if (r < 0)
log_warning_errno(r, "Failed to restore VT, ignoring: %m");
@ -1420,23 +1417,13 @@ void session_leave_vt(Session *s) {
return;
session_device_pause_all(s);
r = vt_release(s->vtfd, false);
r = vt_release(s->vtfd, /* restore = */ false);
if (r == -EIO) {
int vt, old_fd;
/* Handle the same VT hung-up case as in session_restore_vt */
/* It might happen if the controlling process exited before or while we were
* restoring the VT as it would leave the old file-descriptor in a hung-up
* state. In this case let's retry with a fresh handle to the virtual terminal. */
/* We do a little dance to avoid having the terminal be available
* for reuse before we've cleaned it up. */
old_fd = TAKE_FD(s->vtfd);
vt = session_open_vt(s);
safe_close(old_fd);
if (vt >= 0)
r = vt_release(vt, false);
int fd = session_open_vt(s, /* reopen = */ true);
if (fd >= 0)
r = vt_release(fd, /* restore = */ false);
}
if (r < 0)
log_debug_errno(r, "Cannot release VT of session %s: %m", s->id);