Justin Cormack <justin@street-vision.com> writes:

Here is a small patch to add epoll support to uclibc.

The only thing I am not sure about is what needs to be done (if anything)
to make it work on 2.4/2.2 kernels (are the syscall numbers defined but
give errors when called or not?).

Tested on 2.6, though some other issues prevent more extensive testing at
the minute.

Mike Frysinger:
cleaned up patch and added checks to make sure that the syscall actually
exists, returning ENOSYS in cases where it doesn't.

1 files changed, 65 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/common/epoll.c b/libc/sysdeps/linux/common/epoll.c
new file mode 100644
index 000000000..27a9fc526
--- /dev/null
+++ b/libc/sysdeps/linux/common/epoll.c
@@ -0,0 +1,65 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * epoll_create() / epoll_ctl() / epoll_wait() for uClibc
+ *
+ * Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
+ *
+ * GNU Library General Public License (LGPL) version 2 or later.
+ */
+
+#include "syscalls.h"
+#include <sys/epoll.h>
+
+/*
+ * epoll_create()
+ */
+#ifdef __NR_epoll_create
+#define __NR___syscall_epoll_create __NR_epoll_create
+static inline _syscall1(int, __syscall_epoll_create, int, size);
+#endif
+
+int epoll_create(int size)
+{
+#ifdef __NR_epoll_create
+	return (__syscall_epoll_create(size));
+#else
+    __set_errno(ENOSYS);
+    return -1;
+#endif
+}
+
+/*
+ * epoll_ctl()
+ */
+#ifdef __NR_epoll_ctl
+#define __NR___syscall_epoll_ctl __NR_epoll_ctl
+static inline _syscall4(int, __syscall_epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event);
+#endif
+
+int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
+{
+#ifdef __NR_epoll_ctl
+	return (__syscall_epoll_ctl(epfd, op, fd, event));
+#else
+	__set_errno(ENOSYS);
+	return -1;
+#endif
+}
+
+/*
+ * epoll_wait()
+ */
+#ifdef __NR_epoll_wait
+#define __NR___syscall_epoll_wait __NR_epoll_wait
+static inline _syscall4(int, __syscall_epoll_wait, int, epfd, struct epoll_event *, events, int, maxevents, int, timeout);
+#endif
+
+int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout)
+{
+#ifdef __NR_epoll_wait
+	return (__syscall_epoll_wait(epfd, events, maxevents, timeout));
+#else
+	__set_errno(ENOSYS);
+	return -1;
+#endif
+}