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FERROR(3) Linux Programmer's Manual FERROR(3) NAME clearerr, feof, ferror - check and reset stream status SYNOPSIS #include <stdio.h> void clearerr(FILE *stream); int feof(FILE *stream); int ferror(FILE *stream); DESCRIPTION The function clearerr() clears the end-of-file and error indicators for the stream pointed to by stream. The function feof() tests the end-of-file indicator for the stream pointed to by stream, returning nonzero if it is set. The end-of-file indicator can be cleared only by the function clearerr(). The function ferror() tests the error indicator for the stream pointed to by stream, returning nonzero if it is set. The error indicator can be reset only by the clearerr() function. For nonlocking counterparts, see unlocked_stdio(3). RETURN VALUE The feof() function returns nonzero if the end-of-file indicator is set for stream; otherwise, it returns zero. The ferror() function returns nonzero if the error indicator is set for stream; otherwise, it returns zero. ERRORS These functions should not fail and do not set errno. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βclearerr(), feof(), ferror() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO The functions clearerr(), feof(), and ferror() conform to C89, C99, POSIX.1-2001, and POSIX.1-2008. NOTES POSIX.1-2008 specifies that these functions shall not change the value of errno if stream is valid. SEE ALSO open(2), fdopen(3), fileno(3), stdio(3), unlocked_stdio(3) 2021-03-22 FERROR(3)