c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-22 02:27:36 +03:00
Code Issues Packages Projects Releases Wiki Activity

Add SIGSTOP and SIGTSTP handling to issig

Browse Source 
This change adds SIGSTOP and SIGTSTP handling to the issig function; 
this mirrors its behavior on Solaris. This way, long running kernel 
tasks can be stopped with the appropriate signals. Note that doing 
so with ctrl-z on the command line doesn't return control of the tty 
to the shell, because tty handling is done separately from stopping 
the process. That can be future work, if people feel that it is a 
necessary addition.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Issue #810 
Issue #10843 
Closes #11801
This commit is contained in:
Paul Dagnelie
2021-04-15 13:34:35 -07:00
committed by Brian Behlendorf
parent 9c470dc6c0
commit d682e20ba4
7 changed files with 134 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/os/linux/spl/spl-thread.c
+51
View File
@@ -158,3 +158,54 @@ spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...)
} while (1);
}
EXPORT_SYMBOL(spl_kthread_create);
/*
* The "why" argument indicates the allowable side-effects of the call:
*
* FORREAL: Extract the next pending signal from p_sig into p_cursig;
* stop the process if a stop has been requested or if a traced signal
* is pending.
*
* JUSTLOOKING: Don't stop the process, just indicate whether or not
* a signal might be pending (FORREAL is needed to tell for sure).
*/
int
issig(int why)
{
ASSERT(why == FORREAL || why == JUSTLOOKING);
if (!signal_pending(current))
return (0);
if (why != FORREAL)
return (1);
struct task_struct *task = current;
spl_kernel_siginfo_t __info;
sigset_t set;
siginitsetinv(&set, 1ULL << (SIGSTOP - 1) | 1ULL << (SIGTSTP - 1));
sigorsets(&set, &task->blocked, &set);
spin_lock_irq(&task->sighand->siglock);
int ret;
if ((ret = dequeue_signal(task, &set, &__info)) != 0) {
#ifdef HAVE_SIGNAL_STOP
spin_unlock_irq(&task->sighand->siglock);
kernel_signal_stop();
#else
if (current->jobctl & JOBCTL_STOP_DEQUEUED)
spl_set_special_state(TASK_STOPPED);
spin_unlock_irq(&current->sighand->siglock);
schedule();
#endif
return (0);
}
spin_unlock_irq(&task->sighand->siglock);
return (1);
}
EXPORT_SYMBOL(issig);