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