clearerr, feof, ferror, fileno - check and reset stream status
void clearerr(FILE *
int feof(FILE *
int ferror(FILE *
int fileno(FILE *
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
The function clearerr() clears the end-of-file and error indicators for the stream pointed to by
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.
The function fileno() examines the argument
stream and returns the integer file descriptor used to implement this stream. The file descriptor is still owned by
stream and will be closed when fclose(3) is called. Duplicate the file descriptor with dup(2) before passing it to code that might close it.
For nonlocking counterparts, see unlocked_stdio(3).
These functions should not fail and do not set the external variable
errno. (However, in case fileno() detects that its argument is not a valid stream, it must return -1 and set
errno to EBADF.)
For an explanation of the terms used in this section, see attributes(7).
open(2), fdopen(3), stdio(3), unlocked_stdio(3)
This page is part of release 5.10 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/.