clearerr

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 feof() 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).

       ┌──────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                     Attribute     Value   │
       ├──────────────────────────────────────────────┼───────────────┼─────────┤
       │clearerr(), feof(), ferror()                  │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────┴───────────────┴─────────┘

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)

COLOPHON
       This page is part of release 5.11 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.




                                   2021-03-22                          FERROR(3)