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author | Gary Houston <ghouston@arglist.com> | 1997-06-01 00:44:24 +0000 |
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committer | Gary Houston <ghouston@arglist.com> | 1997-06-01 00:44:24 +0000 |
commit | 115b09a50439e841041555bf1f4d6837108f8a6f (patch) | |
tree | 5a2842670d6b1068717775d3236ade688f8614d3 /NEWS | |
parent | e1a191a8ca07dd14b956f6e349044d3dabb424c5 (diff) | |
download | guile-115b09a50439e841041555bf1f4d6837108f8a6f.tar.gz |
provide documentation for sigaction
Diffstat (limited to 'NEWS')
-rw-r--r-- | NEWS | 26 |
1 files changed, 25 insertions, 1 deletions
@@ -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): |