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2004-07-12 Roland McGrath <roland@redhat.com>

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* manual/signal.texi (Interrupted Primitives): Make clear that
	TEMP_FAILURE_RETRY evaluates its expression as long int and compares
	it to -1 to define "failure".
This commit is contained in:
Roland McGrath 2004-07-12 21:44:33 +00:00
parent ee600e3f76
commit 36634622ab
1 changed files with 6 additions and 3 deletions
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9
manual/signal.texi
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@ -2083,9 +2083,12 @@ temporary failure, with the macro @code{TEMP_FAILURE_RETRY}:
@comment unistd.h
@comment GNU
@defmac TEMP_FAILURE_RETRY (@var{expression})
This macro evaluates @var{expression} once. If it fails and reports
error code @code{EINTR}, @code{TEMP_FAILURE_RETRY} evaluates it again,
and over and over until the result is not a temporary failure.
This macro evaluates @var{expression} once, and examines its value as
type @code{long int}. If the value equals @code{-1}, that indicates a
failure and @code{errno} should be set to show what kind of failure.
If it fails and reports error code @code{EINTR},
@code{TEMP_FAILURE_RETRY} evaluates it again, and over and over until
the result is not a temporary failure.
The value returned by @code{TEMP_FAILURE_RETRY} is whatever value
@var{expression} produced.