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ferror fflush（清空文件缓冲区）fgetc fgetpos fgets fgetwc fgetws File input/output fopen fopen_s fprintf fprintf_s fputc fputs fputwc fputws fread freopen freopen_s fscanf fscanf_s fseek fsetpos ftell fwide fwprintf fwprintf_s fwrite fwscanf fwscanf_s getc getchar gets gets_s getwchar perror printf printf_s putc putchar puts putwc putwchar remove rename rewind scanf scanf_s setbuf setvbuf snprintf sprintf sscanf sscanf_s swprintf swprintf_s swscanf swscanf_s tmpfile tmpfile_s tmpnam tmpnam_s ungetc ungetwc vfprintf vfprintf_s vfscanf vfscanf_s vfwprintf vfwprintf_s vfwscanf vfwscanf_s vprintf vprintf_s vscanf vscanf_s vsnprintf vsprintf vsscanf vsscanf_s vswprintf vswprintf_s vswscanf vswscanf_s vwprintf vwprintf_s vwscanf vwscanf_s wprintf wprintf_s wscanf wscanf_s Localization support lconv LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME localeconv Localization support setlocale Numerics abs acos acosf acosh acoshf acoshl acosl asin asinf asinh asinhf asinhl asinl atan atan2 atan2f 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FE_TOWARDZERO FE_UNDERFLOW FE_UPWARD Floating-point environment float_t floor floorf floorl fma fmaf fmal fmax fmaxf fmaxl fmin fminf fminl fmod fmodf fmodl fpclassify FP_INFINITE FP_NAN FP_NORMAL FP_SUBNORMAL FP_ZERO frexp frexpf frexpl HUGE_VAL HUGE_VALF HUGE_VALL hypot hypotf hypotl I ilogb ilogbf ilogbl imaginary imaxabs imaxdiv INFINITY isfinite isgreater isgreaterequal isinf isless islessequal islessgreater isnan isnormal isunordered labs ldexp ldexpf ldexpl ldiv lgamma lgammaf lgammal llabs lldiv llrint llrintf llrintl llround llroundf llroundl log log10 log10f log10l log1p log1pf log1pl log2 log2f log2l logb logbf logbl logf logl lrint lrintf lrintl lround lroundf lroundl MATH_ERREXCEPT math_errhandling MATH_ERRNO modf modff modfl nan NAN nanf nanl nearbyint nearbyintf nearbyintl nextafter nextafterf nextafterl nexttoward nexttowardf nexttowardl Numerics pow powf powl Pseudo-random number generation rand RAND_MAX remainder remainderf remainderl remquo remquof remquol rint rintf rintl round roundf roundl scalbln scalblnf scalblnl scalbn scalbnf scalbnl signbit sin sinf sinh sinhf sinhl sinl sqrt sqrtf sqrtl srand tan tanf tanh tanhf tanhl tanl tgamma tgammaf tgammal trunc truncf truncl Type-generic math _Complex_I _Imaginary_I Program support abort atexit at_quick_exit exit EXIT_FAILURE EXIT_SUCCESS getenv getenv_s jmp_buf longjmp Program support utilities quick_exit raise setjmp SIGABRT SIGFPE SIGILL SIGINT signal SIGSEGV SIGTERM sig_atomic_t SIG_DFL SIG_ERR SIG_IGN system _Exit Strings atof atoi atol atoll btowc c16rtomb c32rtomb char16_t char32_t isalnum isalpha isblank iscntrl isdigit isgraph islower isprint ispunct isspace isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit mblen mbrlen mbrtoc16 mbrtoc32 mbrtowc mbsinit mbsrtowcs mbsrtowcs_s mbstate_t mbstowcs mbstowcs_s mbtowc memchr memcmp memcpy memcpy_s memmove memmove_s memset memset_s Null-terminated byte strings 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文字

在头文件<stdlib.h>中定义
void ignore_handler_s（const char * restrict msg，void * restrict ptr，errno_t error）;		（自C11以来）

该函数只是返回给调用者而不执行任何其他操作。

可以将指向此函数的指针传递给set_constraint_handler_s以建立不执行任何操作的运行时约束违规处理程序。与所有边界检查的函数一样，ignore_handler_s只有__STDC_LIB_EXT1__在实现定义并且用户在包含之前定义__STDC_WANT_LIB_EXT1__为整数常量时1才能保证可用<stdlib.h>。

参数

msg	-	指向描述错误的字符串的指针
ptr	-	指向实现定义的对象或空指针的指针。实现定义对象的示例是对象，该对象给出检测到违规的函数的名称以及检测到违规时的行号
error	-	调用函数返回的错误，如果它恰好是返回errno_t的函数之一

纠错

返回值

(none).

注意

如果ignore_handler_s用作运行时约束处理程序，则可以通过检查边界检查函数调用的结果来检测违规情况，这些函数调用对于不同的函数可能不同（将非零errno_t空字符写入输出字符串的第一个字节等）。

如果set_constraint_handler_s是从来不叫，默认的处理程序是实现定义的：它可能是abort_handler_s，ignore_handler_s或其他一些实现定义的处理程序。

例

#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}

可能的输出：

dst = "", r = 22abort_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 resultof a bug present in the software. Please reach out to your
software's vendor to get more help.Aborted

参考

C11标准（ISO/IEC 9899:2011）：

K.3.6.1.3 ignore_handler_s函数（p:606）

另请参阅

abort_handler_s（C11）	取消对边界检查函数的回调（函数）
set_constraint_handler_s（C11）	为边界检查函数（函数）设置错误回调