Seems this interface be acceptable ?
Looks good to me.
The proposed code changes are in the attached patch.
Proposed wording of addition into RFORK(2):
DESCRIPTION:
RFTSIGZMB If set, the kernel will return selected signal number instead
of SIGCHILD upon thread exit for the child.
The selected signal number have to be encoded into flags
by ORing RFTSIGFLAGS(signum).
ERRORS:
EINVAL An invalid signal was specified.
Petr--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -476,7 +476,10 @@
sigacts_copy(newsigacts, p1->p_sigacts);
p2->p_sigacts = newsigacts;
}
- if (flags & RFLINUXTHPN)
+
+ if (flags & RFTSIGZMB)
+ p2->p_sigparent = RFTSIGNUM(flags);
+ else if (flags & RFLINUXTHPN)
p2->p_sigparent = SIGUSR1;
else
p2->p_sigparent = SIGCHLD;
@@ -723,6 +726,9 @@
if ((flags & (RFFDG|RFCFDG)) == (RFFDG|RFCFDG))
return (EINVAL);
+ if ((flags & RFTSIGZMB) && (RFTSIGNUM(flags) > _SIG_MAXSIG))
+ return (EINVAL);
+
p1 = td->td_proc;
/*
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -180,6 +180,11 @@
#define RFLINUXTHPN (1<<16) /* do linux clone exit parent notification */
#define RFSTOPPED (1<<17) /* leave child in a stopped state */
#define RFHIGHPID (1<<18) /* use a pid higher than 10 (idleproc) */
+#define RFTSIGZMB (1<<19) /* select signal for exit parent notification */
+#define RFTSIGSHIFT 20 /* selected signal number is in bits 20-27 */
+#define RFTSIGMASK 0xFF
+#define RFTSIGNUM(flags) (((flags) >> RFTSIGSHIFT) & RFTSIGMASK)
+#define RFTSIGFLAGS(signum) ((signum) << RFTSIGSHIFT)
#define RFPPWAIT (1<<31) /* parent sleeps until child exits (vfork) */
#define RFKERNELONLY (RFSTOPPED | RFHIGHPID | RFPPWAIT)
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