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exit status clarifications in reference doc

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svn: r11747
This commit is contained in:
Matthew Flatt 2008-09-14 14:15:49 +00:00
parent 3d4c42a442
commit 18176568c7
1 changed files with 15 additions and 6 deletions
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21
collects/scribblings/reference/startup.scrbl
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@ -14,7 +14,7 @@
@(define eventspace
@tech[#:doc '(lib "scribblings/gui/gui.scrbl")]{eventspace})
@title[#:tag "running-sa"]{Starting MzScheme or MrEd}
@title[#:tag "running-sa"]{Running MzScheme or MrEd}
The core PLT Scheme run-time system is available in two main variants:
@ -90,11 +90,20 @@ timers to stop, @|etc| in the main @|eventspace| by evaluating
@scheme[(scheme 'yield)]. This waiting step can be suppressed with the
@Flag{V}/@DFlag{no-yield} command-line flag.
The exit status for the MzScheme or MrEd process indicates an error if
an error occurs during a command-line @scheme[eval], @scheme[load], or
@scheme[require] when no read-eval-print loop is started. Otherwise,
the exit status is @scheme[0] or determined by a call to
@scheme[exit].
@; ----------------------------------------------------------------------
@section[#:tag "exit-status"]{Exit Status}
The default exit status for a MzScheme or MrEd process is non-zero if
an error occurs during a command-line @scheme[eval] (via @Flag{e},
etc.), @scheme[load] (via @Flag{f}, @Flag{r}, etc.), or
@scheme[require] (via @Flag{-l}, @Flag{t}, etc.), but only when no
read-eval-print loop is started. Otherwise, the default exit status is
@scheme[0].
In all cases, a call to @scheme[exit] (when the default @tech{exit
handler} is in place) can end the process with a specific status
value.
@; ----------------------------------------------------------------------