From 68d311b66678d9daffc5cf1c78f3101f2eeec3ea Mon Sep 17 00:00:00 2001 From: Konstantin Belousov Date: Sat, 24 Apr 2021 15:02:40 +0300 Subject: [PATCH] ptracestop: mark threads suspended there with the new TDB_SSWITCH flag This way threads in ptracestop can be discovered by debugger Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29955 --- sys/kern/kern_sig.c | 2 ++ sys/sys/proc.h | 1 + 2 files changed, 3 insertions(+) diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c index 46b520030dc..445582a176c 100644 --- a/sys/kern/kern_sig.c +++ b/sys/kern/kern_sig.c @@ -2648,7 +2648,9 @@ ptracestop(struct thread *td, int sig, ksiginfo_t *si) td->td_dbgflags &= ~TDB_STOPATFORK; } stopme: + td->td_dbgflags |= TDB_SSWITCH; thread_suspend_switch(td, p); + td->td_dbgflags &= ~TDB_SSWITCH; if (p->p_xthread == td) p->p_xthread = NULL; if (!(p->p_flag & P_TRACED)) diff --git a/sys/sys/proc.h b/sys/sys/proc.h index e02e97d7422..b959681e992 100644 --- a/sys/sys/proc.h +++ b/sys/sys/proc.h @@ -485,6 +485,7 @@ do { \ #define TDB_VFORK 0x00000800 /* vfork indicator for ptrace() */ #define TDB_FSTP 0x00001000 /* The thread is PT_ATTACH leader */ #define TDB_STEP 0x00002000 /* (x86) PSL_T set for PT_STEP */ +#define TDB_SSWITCH 0x00004000 /* Suspended in ptracestop */ /* * "Private" flags kept in td_pflags: