1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most

   changes in MD code are trivial, before this change, trapsignal and
   sendsig use discrete parameters, now they uses member fields of
   ksiginfo_t structure. For sendsig, this change allows us to pass
   POSIX realtime signal value to user code.

2. Remove cpu_thread_siginfo, it is no longer needed because we now always
   generate ksiginfo_t data and feed it to libpthread.

3. Add p_sigqueue to proc structure to hold shared signals which were
   blocked by all threads in the proc.

4. Add td_sigqueue to thread structure to hold all signals delivered to
   thread.

5. i386 and amd64 now return POSIX standard si_code, other arches will
   be fixed.

6. In this sigqueue implementation, pending signal set is kept as before,
   an extra siginfo list holds additional siginfo_t data for signals.
   kernel code uses psignal() still behavior as before, it won't be failed
   even under memory pressure, only exception is when deleting a signal,
   we should call sigqueue_delete to remove signal from sigqueue but
   not SIGDELSET. Current there is no kernel code will deliver a signal
   with additional data, so kernel should be as stable as before,
   a ksiginfo can carry more information, for example, allow signal to
   be delivered but throw away siginfo data if memory is not enough.
   SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can
   not be caught or masked.
   The sigqueue() syscall allows user code to queue a signal to target
   process, if resource is unavailable, EAGAIN will be returned as
   specification said.
   Just before thread exits, signal queue memory will be freed by
   sigqueue_flush.
   Current, all signals are allowed to be queued, not only realtime signals.

Earlier patch reviewed by: jhb, deischen
Tested on: i386, amd64

1 files changed, 7 insertions, 22 deletions

diff --git a/sys/powerpc/aim/machdep.c b/sys/powerpc/aim/machdep.c
index a74cc27..d27d48f 100644
--- a/sys/powerpc/aim/machdep.c
+++ b/sys/powerpc/aim/machdep.c
@@ -432,7 +432,7 @@ bzero(void *buf, size_t len)
 }
 
 void
-sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
+sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
 {
 	struct trapframe *tf;
 	struct sigframe *sfp;
@@ -441,10 +441,14 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
 	struct thread *td;
 	struct proc *p;
 	int oonstack, rndfsize;
+	int sig;
+	int code;
 
 	td = curthread;
 	p = td->td_proc;
 	PROC_LOCK_ASSERT(p, MA_OWNED);
+	sig = ksi->ksi_signo;
+	code = ksi->ksi_code;
 	psp = p->p_sigacts;
 	mtx_assert(&psp->ps_mtx, MA_OWNED);
 	tf = td->td_frame;
@@ -512,9 +516,9 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
 		/*
 		 * Fill siginfo structure.
 		 */
+		sf.sf_si = ksi->ksi_info;
 		sf.sf_si.si_signo = sig;
-		sf.sf_si.si_code = code;
-		sf.sf_si.si_addr = (void *)tf->srr0;
+		sf.sf_si.si_addr = (void *)tf->srr0; /* XXX */
 	} else {
 		/* Old FreeBSD-style arguments. */
 		tf->fixreg[FIRSTARG+1] = code;
@@ -543,25 +547,6 @@ sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
 	mtx_lock(&psp->ps_mtx);
 }
 
-/*
- * Build siginfo_t for SA thread
- */
-void
-cpu_thread_siginfo(int sig, u_long code, siginfo_t *si)
-{
-	struct proc *p;
-	struct thread *td;
-
-	td = curthread;
-	p = td->td_proc;
-	PROC_LOCK_ASSERT(p, MA_OWNED);
-
-	bzero(si, sizeof(*si));
-	si->si_signo = sig;
-	si->si_code = code;
-	/* XXXKSE fill other fields */
-}
-
 int
 sigreturn(struct thread *td, struct sigreturn_args *uap)
 {