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Add a timeout to prevent the sequences which wait for a specific

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terminator (OSC, APC and DCS) waiting forever, which helps to avoid
garbage (cat /dev/random) locking up panes completely. This (and the
last commit) prompted by a discussion with theo.
This commit is contained in:
nicm
2017-06-04 09:22:34 +00:00
parent 467ece53e6
commit c5b7faaefc
1 changed files with 49 additions and 9 deletions
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58
input.c
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@@ -93,6 +93,8 @@ struct input_ctx {
const struct input_state *state;
struct event timer;
/*
* All input received since we were last in the ground state. Sent to
* control clients on connection.
@@ -118,6 +120,7 @@ static void input_osc_104(struct window_pane *, const char *);
/* Transition entry/exit handlers. */
static void input_clear(struct input_ctx *);
static void input_ground(struct input_ctx *);
static void input_enter_dcs(struct input_ctx *);
static void input_enter_osc(struct input_ctx *);
static void input_exit_osc(struct input_ctx *);
static void input_enter_apc(struct input_ctx *);
@@ -364,7 +367,7 @@ static const struct input_state input_state_csi_ignore = {
/* dcs_enter state definition. */
static const struct input_state input_state_dcs_enter = {
"dcs_enter",
input_clear, NULL,
input_enter_dcs, NULL,
input_state_dcs_enter_table
};
@@ -756,6 +759,30 @@ input_table_compare(const void *key, const void *value)
return (strcmp(ictx->interm_buf, entry->interm));
}
/*
* Timer - if this expires then have been waiting for a terminator for too
* long, so reset to ground.
*/
static void
input_timer_callback(__unused int fd, __unused short events, void *arg)
{
struct input_ctx *ictx = arg;
struct window_pane *wp = ictx->wp;
log_debug("%s: %%%u %s expired" , __func__, wp->id, ictx->state->name);
input_reset(wp, 0);
}
/* Start the timer. */
static void
input_start_timer(struct input_ctx *ictx)
{
struct timeval tv = { .tv_usec = 100000 };
event_del(&ictx->timer);
event_add(&ictx->timer, &tv);
}
/* Reset cell state to default. */
static void
input_reset_cell(struct input_ctx *ictx)
@@ -782,6 +809,8 @@ input_init(struct window_pane *wp)
ictx->since_ground = evbuffer_new();
evtimer_set(&ictx->timer, input_timer_callback, ictx);
input_reset(wp, 0);
}
@@ -791,6 +820,8 @@ input_free(struct window_pane *wp)
{
struct input_ctx *ictx = wp->ictx;
event_del(&ictx->timer);
free(ictx->input_buf);
evbuffer_free(ictx->since_ground);
@@ -815,14 +846,7 @@ input_reset(struct window_pane *wp, int clear)
screen_write_stop(&ictx->ctx);
}
*ictx->interm_buf = '\0';
ictx->interm_len = 0;
*ictx->param_buf = '\0';
ictx->param_len = 0;
*ictx->input_buf = '\0';
ictx->input_len = 0;
input_clear(ictx);
ictx->state = &input_state_ground;
ictx->flags = 0;
@@ -997,6 +1021,8 @@ input_reply(struct input_ctx *ictx, const char *fmt, ...)
static void
input_clear(struct input_ctx *ictx)
{
event_del(&ictx->timer);
*ictx->interm_buf = '\0';
ictx->interm_len = 0;
@@ -1013,6 +1039,7 @@ input_clear(struct input_ctx *ictx)
static void
input_ground(struct input_ctx *ictx)
{
event_del(&ictx->timer);
evbuffer_drain(ictx->since_ground, EVBUFFER_LENGTH(ictx->since_ground));
if (ictx->input_space > INPUT_BUF_START) {
@@ -1842,6 +1869,16 @@ input_csi_dispatch_sgr(struct input_ctx *ictx)
}
}
/* DCS string started. */
static void
input_enter_dcs(struct input_ctx *ictx)
{
log_debug("%s", __func__);
input_clear(ictx);
input_start_timer(ictx);
}
/* DCS terminator (ST) received. */
static int
input_dcs_dispatch(struct input_ctx *ictx)
@@ -1871,6 +1908,7 @@ input_enter_osc(struct input_ctx *ictx)
log_debug("%s", __func__);
input_clear(ictx);
input_start_timer(ictx);
}
/* OSC terminator (ST) received. */
@@ -1937,6 +1975,7 @@ input_enter_apc(struct input_ctx *ictx)
log_debug("%s", __func__);
input_clear(ictx);
input_start_timer(ictx);
}
/* APC terminator (ST) received. */
@@ -1960,6 +1999,7 @@ input_enter_rename(struct input_ctx *ictx)
log_debug("%s", __func__);
input_clear(ictx);
input_start_timer(ictx);
}
/* Rename terminator (ST) received. */