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runtime_constraint_handler(3c)
Standard C Library Functions
runtime_constraint_handler(3C)
NAME
runtime_constraint_handler, abort_handler_s, ignore_handler_s, set_con‐
straint_handler_s - Runtime-constraint handler functions for the bounds
checking interfaces
SYNOPSIS
#define __STDC_WANT_LIB_EXT1__ 1
#include <stdlib.h>
void abort_handler_s(const char *msg, void *ptr, errno_t error);
void ignore_handler_s(const char *msg, void *ptr, errno_t error);
constraint_handler_t set_constraint_handler_s(
constraint_handler_t handler);
DESCRIPTION
The runtime-constraint handler APIs are part of the C11 bounds checking
interfaces specified in the C11 standard, Annex K. They can be used by
the application to manage the actions taken when a library function
defined to check for runtime-constraints detects a runtime-constraint
violation. When such a function detects a runtime-constraint violation,
the currently registered runtime-constraint handler, set using the
set_constraint_handler_s() function, will be called. See INCITS/ISO/IEC
9899:2011.
The standard allows for implementation specific features of the
abort_handler() and the set_constraint_handler_s() functions. The
abort_handler_s() function writes a message on the standard error as
follows:
(void) fputs(msg, stderr);
(void) fputc('\n', stderr);
When the handler set by the set_constraint_handler_s() function is
called, it is passed a number of arguments in a defined order. Of
these, two of the arguments are implementation defined as follows:
The second argument is a pointer to an object defined as:
typedef struct __rcviolation_info {
const char * __function_name; /* function detected violation */
int __error_raw; /* _RCVIOLATION_* or errno */
int __error; /* canonical errno */
long __pad[8];
} __rcviolation_info_t;
The fourth argument is the default constraint handler used if no calls
have been made to the set_constraint_handler_s() function. In this
case, the ignore_handler_s() function is the default constraint handler
used.
RETURN VALUES
abort_handler_s() No return value
ignore_handler_s() No return value
set_constraint_handler_s() Returns a pointer to the previously regis‐
tered handler
EXAMPLES
Example 1 Calling the Runtime-Constraint Handler
The following example calls the runtime-constraint handler, set by the
set_constraint_handler_s() function when a NULL pointer is passed as an
argument to tmpfile_s() function.
#include <stdio.h>
#include <stdlib.h>
static errno_t err;
void
handler(const char *msg, void *ptr, errno_t err)
{
printf("%s and the function exited with error number: %d\n",
msg, err);
}
int
main(int argc, char *argv[])
{
FILE *fptr;
set_constraint_handler_s(handler);
if ((err = tmpfile_s(&fptr)) == 0)
printf("tmpfile_s is ok\n");
else
printf("tmpfile_s is a failure %d\n", err);
err = tmpfile_s(NULL);
}
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Unsafe
None of these functions can be safely used in a multi-threaded program.
SEE ALSO
asctime_s(3C), bsearch_s(3C), ctime_s(3C), fopen_s(3C), fprintf_s(3C),
freopen_s(3C), fscanf_s(3C), fwscanf_s(3C), fwprintf_s(3C),
getenv_s(3C), gets_s(3C), gmtime_s(3C), localtime_s(3C),
mbsrtowcs_s(3C), mbstowcs_s(3C), memcpy_s(3C), memmove_s(3C),
memset_s(3C), printf_s(3C), qsort_s(3C), scanf_s(3C), snprintf_s(3C),
snwprintf_s(3C), sprintf_s(3C), sscanf_s(3C), strcat_s(3C),
strcpy_s(3C), strerror_s(3C), strerrorlen_s(3C), strncat_s(3C)),
strncpy_s(3C), strnlen_s(3C), strtok_s(3C), swprintf_s(3C),
swscanf_s(3C), tmpfile_s(3C), tmpnam_s(3C), vfprintf_s(3C),
vfscanf_s(3C), vfwprintf_s(3C), vfwscanf_s(3C), vprintf_s(3C),
vscanf_s(3C), vsnprintf_s(3C), vsnwprintf_s(3C), vsscanf_s(3C),
vswprintf_s(3C), vswscanf_s(3C), vwscanf_s(3C), vwprintf_s(3C),
wcrtomb_s(3C), wcscat_s(3C), wcscpy_s(3C), wcsncat_s(3C),
wcsncpy_s(3C), wcsnlen_s(3C), wcsrtombs_s(3C), wcstok_s(3C),
wcstombs_s(3C), wctomb_s(3C), wmemcpy_s(3C), wmemmove_s(3C),
wprintf_s(3C), wscanf_s(3C), libc(3LIB), standards(7)
HISTORY
These functions, along with the rest of the interfaces specified by
Annex K of the C11 standard, were added to Oracle Solaris in the Oracle
Solaris 11.4.0 release.
Oracle Solaris 11.4 30 Jul 2021
runtime_constraint_handler(3C)