diff options
| -rw-r--r-- | Doc/lib/libfcntl.tex | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/Doc/lib/libfcntl.tex b/Doc/lib/libfcntl.tex index ea17665..bf4f375 100644 --- a/Doc/lib/libfcntl.tex +++ b/Doc/lib/libfcntl.tex @@ -30,8 +30,14 @@ The module defines the following functions: structure, e.g.\ created by \function{struct.pack()}. The binary data is copied to a buffer whose address is passed to the C \cfunction{fcntl()} call. The return value after a successful call - is the contents of the buffer, converted to a string object. In - case the \cfunction{fcntl()} fails, an \exception{IOError} is + is the contents of the buffer, converted to a string object. The length + of the returned string will be the same as the length of the \var{arg} + argument. This is limited to 1024 bytes. If the information returned + in the buffer by the operating system is larger than 1024 bytes, + this is most likely to result in a segmentation violation or a more + subtle data corruption. + + If the \cfunction{fcntl()} fails, an \exception{IOError} is raised. \end{funcdesc} |