Improved various error descriptions after message from

[thirdparty/man-pages.git] / man2 / epoll_ctl.2

diff --git a/man2/epoll_ctl.2 b/man2/epoll_ctl.2
index 5eed4b748cedc5c6b1b361665ed62306f4f35184..8c219c5c62449c7db1af64e88424204091d4001a 100644 (file)
--- a/man2/epoll_ctl.2
+++ b/man2/epoll_ctl.2
@@ -81,9 +81,15 @@ operations.
 .TP
 .B EPOLLERR
 Error condition happened on the associated file descriptor.
+.BR epoll_wait (2)
+will always wait for this event; it is not necessary to set it in
+.IR events .
 .TP
 .B EPOLLHUP
 Hang up happened on the associated file descriptor.
+.BR epoll_wait (2)
+will always wait for this event; it is not necessary to set it in
+.IR events .
 .TP
 .B EPOLLET
 Sets the Edge Triggered behaviour for the associated file descriptor.
@@ -154,19 +160,36 @@ is set appropriately.
 .SH ERRORS
 .TP
 .B EBADF
-The
 .I epfd
-file descriptor is not a valid file descriptor.
+is not a valid file descriptor.
+.TP
+.B EEXIST
+.I op
+was EPOLL_CTL_ADD, and the supplied file descriptor
+.IR fd
+is already in
+.IR epfd .
 .TP
 .B EINVAL
-The supplied file descriptor,
-.IR epfd ,
+.IR epfd 
 is not an
 .B epoll
-file descriptor, or the requested operation
+file descriptor,
+or
+.IR fd 
+is the same as
+.IR epfd ,
+or the requested operation
 .I op
 is not supported by this interface.
 .TP
+.B ENOENT
+.I op
+was EPOLL_CTL_MOD or EPOLL_CTL_DEL, and
+.IR fd
+is not in
+.IR epfd .
+.TP
 .B ENOMEM
 There was insufficient memory to handle the requested
 .I op
@@ -175,7 +198,7 @@ control operation.
 .B EPERM
 The target file
 .I fd
-is not supported by
+does not support
 .BR epoll .
 .SH CONFORMING TO
 .BR epoll_ctl (2)