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patch 8.2.5141: using "volatile int" in a signal handler might be wrong

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Problem:    Using "volatile int" in a signal handler might be wrong.
Solution:   Use "volatile sig_atomic_t".
This commit is contained in:
Bram Moolenaar
2022-06-20 13:38:33 +01:00
parent 73171ba434
commit 155f2d1451
6 changed files with 24 additions and 23 deletions
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29
src/os_unix.c
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@@ -8251,9 +8251,9 @@ xsmp_close(void)
/*
* Implement timeout with timer_create() and timer_settime().
*/
static volatile int timeout_flag = FALSE;
static timer_t timer_id;
static int timer_created = FALSE;
static volatile sig_atomic_t timeout_flag = FALSE;
static timer_t timer_id;
static int timer_created = FALSE;
/*
* Callback for when the timer expires.
@@ -8296,7 +8296,7 @@ stop_timeout(void)
* This function is not expected to fail, but if it does it will still return a
* valid flag pointer; the flag will remain stuck as FALSE .
*/
volatile int *
volatile sig_atomic_t *
start_timeout(long msec)
{
struct itimerspec interval = {
@@ -8347,17 +8347,16 @@ delete_timer(void)
}
}
# else
# else // HAVE_TIMER_CREATE
/*
* Implement timeout with setitimer()
*/
static struct itimerval prev_interval;
static struct sigaction prev_sigaction;
static volatile int timeout_flag = FALSE;
static int timer_active = FALSE;
static int timer_handler_active = FALSE;
static int alarm_pending = FALSE;
static struct sigaction prev_sigaction;
static volatile sig_atomic_t timeout_flag = FALSE;
static int timer_active = FALSE;
static int timer_handler_active = FALSE;
static volatile sig_atomic_t alarm_pending = FALSE;
/*
* Handle SIGALRM for a timeout.
@@ -8383,7 +8382,7 @@ stop_timeout(void)
if (timer_active)
{
timer_active = FALSE;
ret = setitimer(ITIMER_REAL, &disarm, &prev_interval);
ret = setitimer(ITIMER_REAL, &disarm, NULL);
if (ret < 0)
// Should only get here as a result of coding errors.
semsg(_(e_could_not_clear_timeout_str), strerror(errno));
@@ -8398,7 +8397,7 @@ stop_timeout(void)
semsg(_(e_could_not_reset_handler_for_timeout_str),
strerror(errno));
}
timeout_flag = 0;
timeout_flag = FALSE;
}
/*
@@ -8412,7 +8411,7 @@ stop_timeout(void)
* This function is not expected to fail, but if it does it will still return a
* valid flag pointer; the flag will remain stuck as FALSE .
*/
volatile int *
volatile sig_atomic_t *
start_timeout(long msec)
{
struct itimerval interval = {
@@ -8461,7 +8460,7 @@ start_timeout(long msec)
timer_handler_active = TRUE;
// Set up the interval timer once the alarm handler is in place.
ret = setitimer(ITIMER_REAL, &interval, &prev_interval);
ret = setitimer(ITIMER_REAL, &interval, NULL);
if (ret < 0)
{
// Should only get here as a result of coding errors.