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Diffstat (limited to 'manual/llio.texi')
| -rw-r--r-- | manual/llio.texi | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/manual/llio.texi b/manual/llio.texi index 4ac6c5fa4f..1d088d8ee2 100644 --- a/manual/llio.texi +++ b/manual/llio.texi @@ -368,6 +368,11 @@ sending it a @code{SIGTTIN} signal isn't working. This might happen if the signal is being blocked or ignored, or because the process group is orphaned. @xref{Job Control}, for more information about job control, and @ref{Signal Handling}, for information about signals. + +@item EINVAL +In some systems, when reading from a character or block device, position +and size offsets must be aligned to a particular block size. This error +indicates that the offsets were not properly aligned. @end table Please note that there is no function named @code{read64}. This is not @@ -515,6 +520,11 @@ The device containing the file is full. This error is returned when you try to write to a pipe or FIFO that isn't open for reading by any process. When this happens, a @code{SIGPIPE} signal is also sent to the process; see @ref{Signal Handling}. + +@item EINVAL +In some systems, when writing to a character or block device, position +and size offsets must be aligned to a particular block size. This error +indicates that the offsets were not properly aligned. @end table Unless you have arranged to prevent @code{EINTR} failures, you should @@ -1582,11 +1592,13 @@ descriptors are checked to see if they are ready for writing; and the conditions. You can pass a null pointer for any of these arguments if you are not interested in checking for that kind of condition. -A file descriptor is considered ready for reading if it is not at end of -file. A server socket is considered ready for reading if there is a -pending connection which can be accepted with @code{accept}; -@pxref{Accepting Connections}. A client socket is ready for writing when -its connection is fully established; @pxref{Connecting}. +A file descriptor is considered ready for reading if a @code{read} +call will not block. This usually includes the read offset being at +the end of the file or there is an error to report. A server socket +is considered ready for reading if there is a pending connection which +can be accepted with @code{accept}; @pxref{Accepting Connections}. A +client socket is ready for writing when its connection is fully +established; @pxref{Connecting}. ``Exceptional conditions'' does not mean errors---errors are reported immediately when an erroneous system call is executed, and do not |