poll, ppoll: use cancel.h

use __SYSCALL_SIGSET_T_SIZE
use non-cancellable select in fallback

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/common/poll.c

@@ -20,31 +20,14 @@
 #include <sys/syscall.h>
 #include <sys/poll.h>
 #include <bits/kernel-features.h>
-
-#ifdef __UCLIBC_HAS_THREADS_NATIVE__
-#include <sysdep-cancel.h>
-#else
-#define SINGLE_THREAD_P 1
-#endif
+#include <cancel.h>
 
 #if defined __ASSUME_POLL_SYSCALL && defined __NR_poll
 
-#define __NR___syscall_poll __NR_poll
-static _syscall3(int, __syscall_poll, struct pollfd *, fds,
-		 unsigned long int, nfds, int, timeout);
+#define __NR___poll_nocancel __NR_poll
+static _syscall3(int, __NC(poll), struct pollfd *, fds,
+		 unsigned long int, nfds, int, timeout)
 
-int poll(struct pollfd *fds, nfds_t nfds, int timeout)
-{
-    if (SINGLE_THREAD_P)
-	return __syscall_poll(fds, nfds, timeout);
-
-#ifdef __UCLIBC_HAS_THREADS_NATIVE__
-    int oldtype = LIBC_CANCEL_ASYNC ();
-    int result = __syscall_poll(fds, nfds, timeout);
-    LIBC_CANCEL_RESET (oldtype);
-    return result;
-#endif
-}
 #else /* !__NR_poll */
 
 #include <alloca.h>
@@ -54,6 +37,7 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 #include <sys/time.h>
 #include <sys/param.h>
 #include <unistd.h>
+#include <sys/select.h>
 
 /* uClinux 2.0 doesn't have poll, emulate it using select */
 
@@ -63,7 +47,7 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
    Returns the number of file descriptors with events, zero if timed out,
    or -1 for errors.  */
 
-int poll(struct pollfd *fds, nfds_t nfds, int timeout)
+int __NC(poll)(struct pollfd *fds, nfds_t nfds, int timeout)
 {
     static int max_fd_size;
     struct timeval tv;
@@ -134,7 +118,7 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 
     while (1)
     {
-	ready = select (maxfd + 1, rset, wset, xset,
+	ready = __NC(select) (maxfd + 1, rset, wset, xset,
 		timeout == -1 ? NULL : &tv);
 
 	/* It might be that one or more of the file descriptors is invalid.
@@ -177,7 +161,7 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 		    if (f->events & POLLPRI)
 			FD_SET (f->fd, sngl_xset);
 
-		    n = select (f->fd + 1, sngl_rset, sngl_wset, sngl_xset,
+		    n = __NC(select) (f->fd + 1, sngl_rset, sngl_wset, sngl_xset,
 			    &sngl_tv);
 		    if (n != -1)
 		    {
@@ -222,4 +206,6 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 }
 
 #endif
-libc_hidden_def(poll)
+CANCELLABLE_SYSCALL(int, poll, (struct pollfd *fds, nfds_t nfds, int timeout),
+		    (fds, nfds, timeout))
+lt_libc_hidden(poll)

libc/sysdeps/linux/common/ppoll.c

@@ -20,19 +20,16 @@
 #include <sys/syscall.h>
 
 #if defined __NR_ppoll && defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
-# define __need_NULL
-# include <stddef.h>
-# include <signal.h>
-# include <sys/poll.h>
-# ifdef __UCLIBC_HAS_THREADS_NATIVE__
-#  include <sysdep-cancel.h>
-# else
-#  define SINGLE_THREAD_P 1
-# endif
-
-int
-ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
-       const sigset_t *sigmask)
+
+#define __need_NULL
+#include <stddef.h>
+#include <signal.h>
+#include <sys/poll.h>
+#include <cancel.h>
+
+static int
+__NC(ppoll)(struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
+	    const sigset_t *sigmask)
 {
 	/* The Linux kernel can in some situations update the timeout value.
 	   We do not want that so use a local variable.  */
@@ -41,14 +38,11 @@ ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
 		tval = *timeout;
 		timeout = &tval;
 	}
-  if (SINGLE_THREAD_P)
-		return INLINE_SYSCALL(ppoll, 5, fds, nfds, timeout, sigmask, _NSIG / 8);
-
-# ifdef __UCLIBC_HAS_THREADS_NATIVE__
-	int oldtype = LIBC_CANCEL_ASYNC ();
-	int result = INLINE_SYSCALL(ppoll, 5, fds, nfds, timeout, sigmask, _NSIG / 8);
-	LIBC_CANCEL_RESET (oldtype);
-	return result;
-# endif
+	return INLINE_SYSCALL(ppoll, 5, fds, nfds, timeout, sigmask, __SYSCALL_SIGSET_T_SIZE);
 }
+
+CANCELLABLE_SYSCALL(int, ppoll, (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
+				 const sigset_t *sigmask),
+		    (fds, nfds, timeout, sigmask))
+
 #endif