clearerr

 

C

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Technical Specifications

Symbol index

 

File input/output

Types and objects
FILE fpos_t      stdinstdoutstderr
Functions
File access fopenfopen_s (C11) freopenfreopen_s (C11) fwide (C95) setbuf setvbuf fclose fflush Direct input/output fread fwrite Unformatted input/output fgetc fgets fputc fputs getchar getsgets_s (until C11)(C11) putchar puts ungetc fgetwcgetwc (C95)(C95) fgetws (C95) fputwcputwc (C95)(C95) fputws (C95) getwchar (C95) putwchar (C95) ungetwc (C95) Formatted input scanffscanfsscanfscanf_sfscanf_ssscanf_s (C11)(C11)(C11) wscanffwscanfswscanfwscanf_sfwscanf_sswscanf_s (C95)(C95)(C95)(C11)(C11)(C11)     vscanfvfscanfvsscanfvscanf_svfscanf_svsscanf_s (C99)(C99)(C99)(C11)(C11)(C11) vwscanfvfwscanfvswscanfvwscanf_svfwscanf_svswscanf_s (C99)(C99)(C99)(C11)(C11)(C11)	Formatted output printffprintfsprintfsnprintfprintf_sfprintf_ssprintf_ssnprintf_s (C99)(C11)(C11)(C11)(C11) wprintffwprintfswprintfwprintf_sfwprintf_sswprintf_ssnwprintf_s (C95)(C95)(C95)(C11)(C11)(C11)(C11)     vprintfvfprintfvsprintfvsnprintfvprintf_svfprintf_svsprintf_svsnprintf_s (C99)(C11)(C11)(C11)(C11) vwprintfvfwprintfvswprintfvwprintf_svfwprintf_svswprintf_svsnwprintf_s (C95)(C95)(C95)(C11)(C11)(C11)(C11) File positioning ftell fgetpos fseek fsetpos rewind Error handling clearerr feof ferror perror Operations on files remove rename tmpfiletmpfile_s (C11) tmpnamtmpnam_s (C11)

 

Defined in header <stdio.h>
void clearerr( FILE *stream );

Resets the error flags and the EOF indicator for the given file stream.

Parameters

stream

-

the file to reset the error flags for

Return value

(none)

Example

Run this code

#include <stdio.h>
#include <assert.h>
 
int main(void)
{
    FILE* tmpf = tmpfile();
    fputs("cppreference.com\n", tmpf);
    rewind(tmpf);
 
    for (int ch; (ch = fgetc(tmpf)) != EOF; putchar(ch)) { }
 
    assert(feof(tmpf)); // the loop is expected to terminate by EOF
    puts("End of file reached");
 
    clearerr(tmpf); // clear EOF
 
    puts(feof(tmpf) ? "EOF indicator set" 
                    : "EOF indicator cleared");
}

Output:

cppreference.com
End of file reached
EOF indicator cleared

References

• C17 standard (ISO/IEC 9899:2018):

• 7.21.10.1 The clearerr function (p: 246)

• C11 standard (ISO/IEC 9899:2011):

• 7.21.10.1 The clearerr function (p: 338)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.10.1 The clearerr function (p: 304)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.10.1 The clearerr function

See also

feof	checks for the end-of-file (function)
perror	displays a character string corresponding of the current error to stderr (function)
ferror	checks for a file error (function)
C++ documentation for clearerr