ferror, feof, clearerr, fileno - stream status inquiries
Feof returns non-zero when end of file is read on the named input stream, otherwise zero. Unless cleared by clearerr, the end-of-file
indication lasts until the stream is closed.
Ferror returns non-zero when an error has occurred reading or writing the named stream, otherwise zero. Unless cleared by clearerr, the
error indication lasts until the stream is closed.
Clearerr resets the error and end-of-file indicators on the named stream.
Fileno returns the integer file descriptor associated with the stream, see open(2).
Currently all of these functions are implemented as macros; they cannot be redeclared.
SEE ALSO fopen(3S), open(2)4th Berkeley Distribution May 14, 1986 FERROR(3S)
Check Out this Related Man Page
FERROR(3) BSD Library Functions Manual FERROR(3)NAME
clearerr, clearerr_unlocked, feof, feof_unlocked, ferror, ferror_unlocked, fileno, fileno_unlocked -- check and reset stream status
Standard C Library (libc, -lc)
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 non-zero if it is set. The end-of-file
indicator can only be cleared by the function clearerr().
The function ferror() tests the error indicator for the stream pointed to by stream, returning non-zero if it is set. The error indicator
can only be reset by the clearerr() function.
The function fileno() examines the argument stream and returns its integer descriptor.
The clearerr_unlocked(), feof_unlocked(), ferror_unlocked(), and fileno_unlocked() functions are equivalent to clearerr(), feof(), ferror(),
and fileno() respectively, except that the caller is responsible for locking the stream with flockfile(3) before calling them. These func-
tions may be used to avoid the overhead of locking the stream and to prevent races when multiple threads are operating on the same stream.
These functions should not fail and do not set the external variable errno.
SEE ALSO open(2), fdopen(3), flockfile(3), stdio(3)STANDARDS
The functions clearerr(), feof(), and ferror() conform to ISO/IEC 9899:1990 (``ISO C90'').
BSD January 10, 2003 BSD
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Why this code give me the right output (an integer on the stdout):
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