clearerr_sclearerr_s

重置流的错误指示符。Resets the error indicator for a stream. 这是 clearerr 版本,具有 CRT 中的安全功能中所述的安全增强功能。This is a version of clearerr with security enhancements as described in Security Features in the CRT.

语法Syntax

errno_t clearerr_s(
   FILE *stream
);

参数Parameters

stream
指向文件结构Pointer to FILE structure

返回值Return Value

如果成功,则为零EINVAL如果NULLZero if successful; EINVAL if stream is NULL.

备注Remarks

Clearerr_s函数重置错误指示器和的文件尾指示器The clearerr_s function resets the error indicator and end-of-file indicator for stream. 错误指示符不自动清除;设置指定的流的错误指示器后,该流上继续执行操作来返回之前的错误值clearerr_sclearerrfseekfsetpos,或rewind调用。Error indicators are not automatically cleared; once the error indicator for a specified stream is set, operations on that stream continue to return an error value until clearerr_s, clearerr, fseek, fsetpos, or rewind is called.

如果NULL,则调用无效参数处理程序,如中所述参数验证If stream is NULL, the invalid parameter handler is invoked, as described in Parameter Validation. 如果允许执行继续,此函数将errnoEINVAL并返回EINVALIf execution is allowed to continue, this function sets errno to EINVAL and returns EINVAL.

要求Requirements

例程Routine 必需的标头Required header
clearerr_sclearerr_s <stdio.h><stdio.h>

有关其他兼容性信息,请参阅 兼容性For additional compatibility information, see Compatibility.

示例Example

// crt_clearerr_s.c
// This program creates an error
// on the standard input stream, then clears
// it so that future reads won't fail.

#include <stdio.h>

int main( void )
{
   int c;
   errno_t err;

   // Create an error by writing to standard input.
   putc( 'c', stdin );
   if( ferror( stdin ) )
   {
      perror( "Write error" );
      err = clearerr_s( stdin );
      if (err != 0)
      {
         abort();
      }
   }

   // See if read causes an error.
   printf( "Will input cause an error? " );
   c = getc( stdin );
   if( ferror( stdin ) )
   {
      perror( "Read error" );
      err = clearerr_s( stdin );
      if (err != 0)
      {
         abort();
      }
   }
}

n

      nWrite error: Bad file descriptor
Will input cause an error? n

请参阅See also

错误处理Error Handling
流 I/OStream I/O
clearerrclearerr
_eof_eof
feoffeof
ferrorferror
perror、_wperrorperror, _wperror