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provide documentation for sigaction

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Gary Houston 1997-06-01 00:44:24 +00:00
parent e1a191a8ca
commit 115b09a504
1 changed files with 25 additions and 1 deletions
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26
NEWS
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@ -46,7 +46,31 @@ of SCSH's regular expression functions. They are:
if an error occurs.
** A new procedure `sigaction' can be used to install signal handlers
(documentation to be provided).
(sigaction signum [action] [flags])
signum is the signal number, which can be specified using the value
of SIGINT etc.
If action is omitted, sigaction returns a pair: the CAR is the current
signal hander, which will be either an integer with the value SIG_DFL
(default action) or SIG_IGN (ignore), or the Scheme procedure which
handles the signal, or #f if a non-Scheme procedure handles the
signal. The CDR contains the current sigaction flags for the handler.
If action is provided, it is installed as the new handler for signum.
action can be a Scheme procedure taking one argument, or the value of
SIG_DFL (default action) or SIG_IGN (ignore), or #f to restore
whatever signal handler was installed before sigaction was first used.
Flags can optionally be specified for the new handler (SA_RESTART is
always used if the system provides it, so need not be specified.) The
return value is a pair with information about the old handler as
described above.
This interface does not provide access to the "signal blocking"
facility. Maybe this is not needed, since the thread support may
provide solutions to the problem of consistent access to data
structures.
Changes in Guile 1.1 (Fri May 16 1997):