D31566.diff
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	Index: sys/kern/kern_prot.c
	===================================================================
	--- sys/kern/kern_prot.c
	+++ sys/kern/kern_prot.c
	@@ -158,24 +158,36 @@
	#endif
	int
	sys_getpgid(struct thread td, struct getpgid_args uap)
	+{
	+ pid_t pgid;
	+ int error;
	+
	+ error = kern_getpgid(td, uap->pid, &pgid);
	+ if (error == 0)
	+ td->td_retval[0] = pgid;
	+ return (error);
	+}
	+
	+int
	+kern_getpgid(struct thread td, pid_t pid, pid_t pgid)
	{
	struct proc *p;
	int error;

	- if (uap->pid == 0) {
	+ if (pid == 0) {
	p = td->td_proc;
	PROC_LOCK(p);
	} else {
	- p = pfind(uap->pid);
	+ p = pfind(pid);
	if (p == NULL)
	return (ESRCH);
	error = p_cansee(td, p);
	- if (error) {
	+ if (error != 0) {
	PROC_UNLOCK(p);
	return (error);
	}
	}
	- td->td_retval[0] = p->p_pgrp->pg_id;
	+ *pgid = p->p_pgrp->pg_id;
	PROC_UNLOCK(p);
	return (0);
	}
	Index: sys/sys/syscallsubr.h
	===================================================================
	--- sys/sys/syscallsubr.h
	+++ sys/sys/syscallsubr.h
	@@ -158,6 +158,7 @@
	int kern_getfsstat(struct thread td, struct statfs *buf, size_t bufsize,
	size_t *countp, enum uio_seg bufseg, int mode);
	int kern_getitimer(struct thread , u_int, struct itimerval );
	+int kern_getpgid(struct thread , pid_t, pid_t );
	int kern_getppid(struct thread *);
	int kern_getpeername(struct thread td, int fd, struct sockaddr *sa,
	socklen_t *alen);