From c034b2e1655dd2856f8b6f3247e6e406e46c24a4 Mon Sep 17 00:00:00 2001
From: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Date: Thu, 4 Mar 2010 12:59:10 +0100
Subject: poll: unavailable on linux < 2.2.0

fixes bug #253

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
---
 libc/sysdeps/linux/common/bits/kernel-features.h | 5 +++++
 libc/sysdeps/linux/common/poll.c                 | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

(limited to 'libc')

diff --git a/libc/sysdeps/linux/common/bits/kernel-features.h b/libc/sysdeps/linux/common/bits/kernel-features.h
index 88297349a..b04ad6d3e 100644
--- a/libc/sysdeps/linux/common/bits/kernel-features.h
+++ b/libc/sysdeps/linux/common/bits/kernel-features.h
@@ -28,6 +28,11 @@
 #include <linux/version.h>
 #define __LINUX_KERNEL_VERSION	LINUX_VERSION_CODE
 
+/* When was `poll' introduced?  */
+#if __LINUX_KERNEL_VERSION >= 131584
+# define __ASSUME_POLL_SYSCALL          1
+#endif
+
 /* Real-time signal became usable in 2.1.70.  */
 #if __LINUX_KERNEL_VERSION >= 131398
 # define __ASSUME_REALTIME_SIGNALS	1
diff --git a/libc/sysdeps/linux/common/poll.c b/libc/sysdeps/linux/common/poll.c
index 4a6f06e19..52f6c76b4 100644
--- a/libc/sysdeps/linux/common/poll.c
+++ b/libc/sysdeps/linux/common/poll.c
@@ -19,8 +19,9 @@
 
 #include <sys/syscall.h>
 #include <sys/poll.h>
+#include <bits/kernel-features.h>
 
-#ifdef __NR_poll
+#if defined __ASSUME_POLL_SYSCALL && defined __NR_poll
 
 _syscall3(int, poll, struct pollfd *, fds,
 	unsigned long int, nfds, int, timeout)
-- 
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