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.\" Copyright 2018 Yuri Pankov <yuripv@yuripv.net>
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd August 18, 2018
.Dt SET_CONSTRAINT_HANDLER_S 3
.Os
.Sh NAME
.Nm set_constraint_handler_s ,
.Nm abort_handler_s ,
.Nm ignore_handler_s
.Nd runtime-constraint violation handling
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #define __STDC_WANT_LIB_EXT1__ 1
.In stdlib.h
.Ft constraint_handler_t
.Fo set_constraint_handler_s
.Fa "constraint_handler_t handler"
.Fc
.Ss Handler Prototype
.Ft typedef void
.Fo (*constraint_handler_t)
.Fa "const char * restrict msg"
.Fa "void * restrict ptr"
.Fa "errno_t error"
.Fc
.Ss Predefined Handlers
.Ft void
.Fo abort_handler_s
.Fa "const char * restrict msg"
.Fa "void * restrict ptr"
.Fa "errno_t error"
.Fc
.Ft void
.Fo ignore_handler_s
.Fa "const char * restrict msg"
.Fa "void * restrict ptr"
.Fa "errno_t error"
.Fc
.Sh DESCRIPTION
The
.Fn set_constraint_handler_s
function sets the runtime-constraint violation handler to be
.Fa handler .
.Pp
The runtime-constraint handler is the callback function invoked when a library
function detects a runtime-constraint violation.
.Pp
The arguments are as follows:
.Bl -tag -width "error"
.It Fa msg
A pointer to a character string describing the runtime-constraint violation.
.It Fa ptr
A
.Dv NULL
pointer.
.It Fa error
If the function calling the handler has a return type declared as
.Vt errno_t ,
the return value of the function is passed.
Otherwise, a positive value of type
.Vt errno_t
is passed.
.El
.Pp
Only the most recent handler registered with
.Fn set_constraint_handler_s
is called when a runtime-constraint violation occurs.
.Pp
The implementation has a default constraint handler that is used if no calls to
the
.Fn set_constraint_handler_s
function have been made.
If the
.Fa handler
argument to
.Fn set_constraint_handler_s
is a
.Dv NULL
pointer, the default handler becomes the current constraint handler.
.Pp
The
.Fn abort_handler_s
and
.Fn ignore_handler_s
are the standard-defined runtime-constraint handlers provided by the C library.
.Pp
The
.Fn abort_handler_s
function writes the error message including the
.Fa msg
to
.Dv stderr
and calls the
.Xr abort 3
function.
The
.Fn abort_handler_s
is currently the default runtime-constraint handler.
.Pp
The
.Fn ignore_handler_s
simply returns to its caller.
.Sh RETURN VALUES
The
.Fn set_constraint_handler_s
function returns a pointer to the previously registered handler, or
.Dv NULL
if none was previously registered.
.Pp
The
.Fn abort_handler_s
function does not return to its caller.
.Pp
The
.Fn ignore_handler_s
function returns no value.
.Sh STANDARDS
The
.Fn set_constraint_handler_s
function conforms to
.St -isoC-2011
K.3.6.1.1.
.Sh AUTHORS
This manual page was written by
.An Yuri Pankov Aq Mt yuripv@yuripv.net .
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