The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=2ea2987d14d4d58fc6afe15e790dc9aa075038cc
commit 2ea2987d14d4d58fc6afe15e790dc9aa075038cc Author: Konstantin Belousov <[email protected]> AuthorDate: 2021-06-05 18:24:35 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2021-06-22 01:45:32 +0000 Add a knob to disable dequeueing SIGCHLD on waiting for live process (cherry picked from commit a12e901a5a65417849c1ccf1e37b8d092fa438da) --- sys/kern/kern_exit.c | 14 +++++++++++--- sys/sys/sysent.h | 1 + 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c index cb5996982a3a..fcd8b39a8ee2 100644 --- a/sys/kern/kern_exit.c +++ b/sys/kern/kern_exit.c @@ -105,6 +105,11 @@ SYSCTL_INT(_kern, OID_AUTO, kill_on_debugger_exit, CTLFLAG_RWTUN, &kern_kill_on_dbg_exit, 0, "Kill ptraced processes when debugger exits"); +static bool kern_wait_dequeue_sigchld = 1; +SYSCTL_BOOL(_kern, OID_AUTO, wait_dequeue_sigchld, CTLFLAG_RWTUN, + &kern_wait_dequeue_sigchld, 0, + "Dequeue SIGCHLD on wait(2) for live process"); + struct proc * proc_realparent(struct proc *child) { @@ -1207,9 +1212,12 @@ report_alive_proc(struct thread *td, struct proc *p, siginfo_t *siginfo, p->p_flag &= ~P_CONTINUED; else p->p_flag |= P_WAITED; - PROC_LOCK(td->td_proc); - sigqueue_take(p->p_ksi); - PROC_UNLOCK(td->td_proc); + if (kern_wait_dequeue_sigchld && + (td->td_proc->p_sysent->sv_flags & SV_SIG_WAITNDQ) == 0) { + PROC_LOCK(td->td_proc); + sigqueue_take(p->p_ksi); + PROC_UNLOCK(td->td_proc); + } } sx_xunlock(&proctree_lock); if (siginfo != NULL) { diff --git a/sys/sys/sysent.h b/sys/sys/sysent.h index 95e9dcb1a335..8b0903f7dcc0 100644 --- a/sys/sys/sysent.h +++ b/sys/sys/sysent.h @@ -162,6 +162,7 @@ struct sysentvec { #define SV_ASLR 0x080000 /* ASLR allowed. */ #define SV_RNG_SEED_VER 0x100000 /* random(4) reseed generation. */ #define SV_SIG_DISCIGN 0x200000 /* Do not discard ignored signals */ +#define SV_SIG_WAITNDQ 0x400000 /* Wait does not dequeue SIGCHLD */ #define SV_ABI_MASK 0xff #define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
