Copyright (c) 2007 The NetBSD Foundation, Inc.
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by Luke Mewburn.
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.Dd September 25, 2007 .Dt RAISE_DEFAULT_SIGNAL 3 .Os .Sh NAME .Nm raise_default_signal .Nd raise the default signal handler .Sh LIBRARY .Lb libutil .Sh SYNOPSIS n util.h .Ft int .Fo raise_default_signal .Fa "int sig" .Fc .Sh DESCRIPTION The .Fn raise_default_signal function raises the default signal handler for the signal .Fa sig . This function may be used by a user-defined signal handler router to ensure that a parent process receives the correct notification of a process termination by a signal. This can be used to avoid a common programming mistake when terminating a process from a custom .Dv SIGINT or .Dv SIGQUIT signal handler.
p The operations performed are: l -enum -offset indent t Block all signals, using .Xr sigprocmask 2 . t Set the signal handler for signal .Fa sig to the default signal handler .Dv ( SIG_DFL ) . t .Xr raise 3 signal .Fa sig . t Unblock signal .Fa sig to deliver it. t Restore the original signal mask and handler, even if there was a failure. .El
p See .Xr signal 7 for a table of signals and default actions.
p The .Fn raise_default_signal function should be async-signal-safe. .Sh RETURN VALUES Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS The .Fn raise_default_signal function may fail and set .Va errno for any of the errors specified for the functions .Xr sigemptyset 3 , .Xr sigfillset 3 , .Xr sigaddset 3 , .Xr sigprocmask 2 , .Xr sigaction 2 , or .Xr raise 3 . .Sh SEE ALSO .Xr sigaction 2 , .Xr sigprocmask 2 , .Xr raise 3 , .Xr signal 7 .Sh HISTORY The .Fn raise_default_signal function first appeared in .Nx 5.0 .
Indexes created Sat Sep 20 22:09:52 GMT 2025