Re: [PATCH] 3/3 Generic sys_rt_sigsuspend

[David Woodhouse <dwmw2@infradead.org>]

On Tue, 2005-11-29 at 07:18 +0200, Mika Penttilä wrote:
> You are not setting saved_sigmask here. 

Oops; well spotted. Thanks.

> And shouldn't it return -EINTR?

I believe not. The previous versions would loop until do_signal()
returned non-zero; i.e. until a signal was actually delivered.
By returning -ERESTARTNOHAND we achieve the same effect. If there's a
signal delivered, that gets magically converted to -EINTR, but if
there's no signal delivered, the syscall gets restarted.

diff -u b/kernel/compat.c b/kernel/compat.c
--- b/kernel/compat.c
+++ b/kernel/compat.c
@@ -859,7 +859,7 @@
 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
 {
-	sigset_t saveset, newset;
+	sigset_t newset;
 	compat_sigset_t newset32;
 
 	/* XXX: Don't preclude handling different sized sigset_t's.  */
@@ -872,7 +872,7 @@
 	sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 
 	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
+	current->saved_sigmask = current->blocked;
 	current->blocked = newset;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
diff -u b/kernel/signal.c b/kernel/signal.c
--- b/kernel/signal.c
+++ b/kernel/signal.c
@@ -2626,7 +2626,7 @@
 #ifdef __ARCH_WANT_SYS_RT_SIGSUSPEND
 long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
 {
-	sigset_t saveset, newset;
+	sigset_t newset;
 
 	/* XXX: Don't preclude handling different sized sigset_t's.  */
 	if (sigsetsize != sizeof(sigset_t))
@@ -2637,7 +2637,7 @@
 	sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 
 	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
+	current->saved_sigmask = current->blocked;
 	current->blocked = newset;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);


-- 
dwmw2


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