NAME
set_constraint_handler_s, abort_handler_s, ignore_handler_s – runtime-constraint violation handling
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#define __STDC_WANT_LIB_EXT1__ 1
#include <stdlib.h>
constraint_handler_t
set_constraint_handler_s(constraint_handler_t handler);
Handler Prototype
typedef void
(*constraint_handler_t)(const char * restrict msg, void * restrict ptr, errno_t error);
Predefined Handlers
void
abort_handler_s(const char * restrict msg, void * restrict ptr, errno_t error);
void
ignore_handler_s(const char * restrict msg, void * restrict ptr, errno_t error);
DESCRIPTION
The set_constraint_handler_s() function sets the runtime-constraint violation handler to be handler.
The runtime-constraint handler is the callback function invoked when a library function detects a runtime-constraint violation.
The arguments are as follows:
- msg
-
A pointer to a character string describing the runtime-constraint violation.
- ptr
-
A NULL pointer.
- error
-
If the function calling the handler has a return type declared as errno_t, the return value of the function is passed. Otherwise, a positive value of type errno_t is passed.
Only the most recent handler registered with set_constraint_handler_s() is called when a runtime-constraint violation occurs.
The implementation has a default constraint handler that is used if no calls to the set_constraint_handler_s() function have been made. If the handler argument to set_constraint_handler_s() is a NULL pointer, the default handler becomes the current constraint handler.
The abort_handler_s() and ignore_handler_s() are the standard-defined runtime-constraint handlers provided by the C library.
The abort_handler_s() function writes the error message including the msg to stderr and calls the abort(3) function. The abort_handler_s() is currently the default runtime-constraint handler.
The ignore_handler_s() simply returns to its caller.
RETURN VALUES
The set_constraint_handler_s() function returns a pointer to the previously registered handler, or NULL if none was previously registered.
The abort_handler_s() function does not return to its caller.
The ignore_handler_s() function returns no value.
STANDARDS
The set_constraint_handler_s() function conforms to ISO/IEC 9899:2011 (“ISO C11”) K.3.6.1.1.
AUTHORS
This manual page was written by Yuri Pankov ⟨[email protected]⟩.