ssignal(3C) ssignal(3C)
NAME
ssignal(), gsignal() - software signals
SYNOPSIS
DESCRIPTION
and implement a software facility similar to signal(5). This facility is used by the Standard C Library to enable users to indicate the
disposition of error conditions, and is also made available to users for their own purposes.
Software signals made available to users are associated with integers in the inclusive range 1 through 15. A call to associates a proce-
dure, action, with the software signal sig; the software signal, sig, is raised by a call to Raising a software signal causes the action
established for that signal to be taken.
The first argument to is a number identifying the type of signal for which an action is to be established. The second argument defines the
action; it is either the name of a (user-defined) action function or one of the manifest constants (default) or (ignore). returns the
action previously established for that signal type; if no action has been established or the signal number is illegal, returns
raises the signal identified by its argument, sig:
o If an action function has been established for sig, that action is reset to and the action function is entered with argument sig.
returns the value returned to it by the action function.
o If the action for sig is returns the value 1 and takes no other action.
o If the action for sig is returns the value 0 and takes no other action.
o If sig has an illegal value or no action was ever specified for sig, returns the value 0 and takes no other action.
SEE ALSO
signal(5), thread_safety(5).
NOTES
Some additional signals with numbers outside the range 1 through 15 are used by the Standard C Library to indicate error conditions. Those
signal numbers outside the range 1 through 15 are legal, although their use may interfere with the operation of the Standard C Library.
STANDARDS CONFORMANCE
ssignal(3C)
