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Showing content from http://en.cppreference.com/w/c/numeric/math/../../io/../error/set_constraint_handler_s.html below:

set_constraint_handler_s, constraint_handler_t - cppreference.com

constraint_handler_t set_constraint_handler_s( constraint_handler_t handler );

(1) (since C11) typedef void (*constraint_handler_t)( const char* restrict msg,

                                      void* restrict ptr,

                                      errno_t error ); (2) (since C11) 1)

Configures the handler to be called by all

bounds-checked functions

on a runtime constraint violation or restores the default handler (if

handler

is a null pointer).

2) The pointer to a handler that will be called on a runtime constraint violation.

If set_constraint_handler_s is never called, the default handler is implementation-defined: it may be abort_handler_s, ignore_handler_s, or some other implementation-defined handler.

As with all bounds-checked functions, set_constraint_handler_s and constraint_handler_t are only guaranteed to be available if __STDC_LIB_EXT1__ is defined by the implementation and if the user defines __STDC_WANT_LIB_EXT1__ to the integer constant 1 before including <stdlib.h>.

[edit] Parameters handler - pointer to function of type constraint_handler_t or a null pointer msg - pointer to character string that describes the error ptr - pointer to an implementation-defined object or a null pointer. Examples of implementation-defined objects are objects that give the name of the function that detected the violation and the line number when the violation was detected error - the error about to be returned by the calling function, if it happens to be one of the functions that return errno_t [edit] Return value

A pointer to the previously-installed runtime constraints handler. (Note: this pointer is never a null pointer because calling set_constraint_handler_s(NULL) sets up the system default handler).

[edit] Example 
#define __STDC_WANT_LIB_EXT1__ 1
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
#ifdef __STDC_LIB_EXT1__
    char dst[2];
    set_constraint_handler_s(ignore_handler_s);
    int r = strcpy_s(dst, sizeof dst, "Too long!");
    printf("dst = \"%s\", r = %d\n", dst, r);
    set_constraint_handler_s(abort_handler_s);
    r = strcpy_s(dst, sizeof dst, "Too long!");
    printf("dst = \"%s\", r = %d\n", dst, r);
#endif
}

Possible output:

dst = "", r = 22
abort_handler_s was called in response to a runtime-constraint violation.
 
The runtime-constraint violation was caused by the following expression in strcpy_s:
(s1max <= (s2_len=strnlen_s(s2, s1max)) ) (in string_s.c:62)
 
Note to end users: This program was terminated as a result
of a bug present in the software. Please reach out to your
software's vendor to get more help.
Aborted
[edit] References
[edit] See also

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