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Index: sys/kern/kern_sig.c
===================================================================
--- sys/kern/kern_sig.c
+++ sys/kern/kern_sig.c
@@ -189,6 +189,10 @@
SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
&do_coredump, 0, "Enable/Disable coredumps");
+static int do_corestop = 0;
+SYSCTL_INT(_kern, OID_AUTO, corestop, CTLFLAG_RW,
+ &do_corestop, 0, "Send SIGSTOP before dumping core");
+
static int set_core_nodump_flag = 0;
SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
0, "Enable setting the NODUMP flag on coredump files");
@@ -2004,6 +2008,7 @@
struct sigacts *ps;
struct proc *p;
sigset_t sigmask;
+ char pidstr[16];
int code, sig;
p = td->td_proc;
@@ -2018,6 +2023,15 @@
sigmask = td->td_sigmask;
if (td->td_sigblock_val != 0)
SIGSETOR(sigmask, fastblock_mask);
+
+ if (do_corestop && (sigprop(sig) & SIGPROP_CORE) &&
+ (p->p_flag2 & P2_CORESTOPPED) == 0) {
+ ksi->ksi_signo = sig = SIGSTOP;
+ p->p_flag2 |= P2_CORESTOPPED;
+ snprintf(pidstr, sizeof(pidstr), "pid=%d", p->p_pid);
+ devctl_notify("kernel", "signal", "corestop", pidstr);
+ }
+
if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
!SIGISMEMBER(sigmask, sig)) {
#ifdef KTRACE
Index: sys/sys/proc.h
===================================================================
--- sys/sys/proc.h
+++ sys/sys/proc.h
@@ -782,6 +782,7 @@
#define P2_PROTMAX_DISABLE 0x00000400 /* Force disable implied PROT_MAX. */
#define P2_STKGAP_DISABLE 0x00000800 /* Disable stack gap for MAP_STACK */
#define P2_STKGAP_DISABLE_EXEC 0x00001000 /* Stack gap disabled after exec */
+#define P2_CORESTOPPED 0x00002000 /* Crashed, got SIGSTOP */
/* Flags protected by proctree_lock, kept in p_treeflags. */
#define P_TREE_ORPHANED 0x00000001 /* Reparented, on orphan list */

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