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Rework the start session method in SCP

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The start session method is reworked to pass a response back to the
client.
If the method was successful, a session list entry is created. This
is different to the provious behaviour, where we created the
session list entry unconditionally.

This new arrangement means that we need a different way to avoid
a race condition where two users may try to create a session at the
same time, and end up with the same display. We do this by keeping
track of newly allocated displays as part of the SCP connections. When
we allocate a display, the SCP connection displays are also taken
into account.
This commit is contained in:
matt335672
2025-06-10 11:06:20 +01:00
parent 7baa27a59f
commit 3e38d9be80
17 changed files with 604 additions and 328 deletions
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sesman/sesexec/session.c
+15 -12
View File
@@ -1086,20 +1086,23 @@ session_send_term(struct session_data *sd, int wait_for_all)
g_sigterm(sd->win_mgr);
}
while (session_active(sd))
if (wait_for_all)
{
/* Don't check SIGTERM - we shouldn't be here long */
if (g_obj_wait(&g_sigchld_event, 1, NULL, 0, -1) != 0)
while (session_active(sd))
{
/* should not get here */
LOG(LOG_LEVEL_WARNING, "session_send_term: "
"Unexpected error from g_obj_wait()");
g_sleep(100);
}
else
{
g_reset_wait_obj(g_sigchld_event);
session_process_sigchld_event(sd);
/* Don't check SIGTERM - we shouldn't be here long */
if (g_obj_wait(&g_sigchld_event, 1, NULL, 0, -1) != 0)
{
/* should not get here */
LOG(LOG_LEVEL_WARNING, "session_send_term: "
"Unexpected error from g_obj_wait()");
g_sleep(100);
}
else
{
g_reset_wait_obj(g_sigchld_event);
session_process_sigchld_event(sd);
}
}
}
}