+ Added documentation for uname

+ Mentioned open/read+write in dup->outport description

doc/scsh-manual/syscalls.tex

@@ -548,12 +548,13 @@ and some port is already using that file descriptor,
 the port is first quietly shifted (with another \ex{dup}) 
 to some other file descriptor (zeroing its revealed count).
 
-Since {\Scheme} doesn't provide read/write ports, 
+Since {\Scheme} doesn't provide read/write ports, \ex{dup->inport} and
-\ex{dup->inport} and \ex{dup->outport} can be useful for 
+\ex{dup->outport} can be useful for getting an output version of an
-getting an output version of an input port, or \emph{vice versa}.
+input port, or \emph{vice versa}.  For example, if \ex{p} is an input
-For example, if \ex{p} is an input port open on a tty, and
+port open on a tty, and we would like to do output to that tty, we can
-we would like to do output to that tty, we can simply use
+simply use \ex{(dup->outport p)} to produce an equivalent output port
-\ex{(dup->outport p)} to produce an equivalent output port for the tty.
+for the tty. Be sure to open the file with the \ex{open/read+write}
+flag for this.
 \end{desc}
 
 \defun {seek} {fd/port offset [whence]} {\integer}
@@ -2405,6 +2406,24 @@ This may be a local name, such as ``solar,'' as opposed to a
 fully-qualified domain name such as ``solar.csie.ntu.edu.tw.''
 \end{desc}
 
+\defun {uname}{} {uname-record}
+\begin{desc}
+  Returns a \emph{uname-record} of the following structure:
+\begin{code}
+(define-record uname
+   os-name
+   node-name
+   release
+   version
+   machine)\end{code}%
+
+Each of the fields contains a string.
+
+Be aware that POSIX limits the length of all entries to 32 characters,
+and that the node name does not necessarily correspond to the
+fully-qualified domain name.
+\end{desc}
+
 \section{Signal system}
 
 Signal numbers are bound to the variables \ex{signal/hup}, \ex{signal/int},