SYNOPSIS<\/a>
DESCRIPTION<\/a>
ERRORS<\/a>
ATTRIBUTES<\/a>
CONFORMING TO<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n
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NAME <\/a> <\/h2>\nclearerr, feof, ferror, fileno \u2212 check and reset stream status<\/p>\n
SYNOPSIS <\/a> <\/h2>\n#include <\/b><\/p>\nvoid clearerr(FILE *<\/b>stream<\/i>);<\/b><\/p>\n
int feof(FILE *<\/b>stream<\/i>);<\/b><\/p>\n
int ferror(FILE *<\/b>stream<\/i>);<\/b><\/p>\n
int fileno(FILE *<\/b>stream<\/i>);<\/b><\/p>\n
Feature Test Macro Requirements for glibc (see feature_test_macros<\/b>(7)):<\/p>\n
fileno<\/b>(): _POSIX_C_SOURCE<\/p>\nDESCRIPTION <\/a> <\/h2>\nThe function clearerr<\/b>() clears the end-of-file and error indicators for the stream pointed to by stream<\/i>.<\/p>\n
The function feof<\/b>() tests the end-of-file indicator for the stream pointed to by stream<\/i>, returning nonzero if it is set. The end-of-file indicator can be cleared only by the function clearerr<\/b>().<\/p>\n
The function ferror<\/b>() tests the error indicator for the stream pointed to by stream<\/i>, returning nonzero if it is set. The error indicator can be reset only by the clearerr<\/b>() function.<\/p>\n
The function fileno<\/b>() examines the argument stream<\/i> and returns the integer file descriptor used to implement this stream. The file descriptor is still owned by stream<\/i> and will be closed when fclose<\/b>(3) is called. Duplicate the file descriptor with dup<\/b>(2) before passing it to code that might close it.<\/p>\n
For nonlocking counterparts, see unlocked_stdio<\/b>(3).<\/p>\nERRORS <\/a> <\/h2>\nThese functions should not fail and do not set the external variable errno<\/i>. (However, in case fileno<\/b>() detects that its argument is not a valid stream, it must return \u22121 and set errno<\/i> to EBADF<\/b>.)<\/p>\nATTRIBUTES <\/a> <\/h2>\nFor an explanation of the terms used in this section, see attributes<\/b>(7).<\/p>\n\n\n<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n<\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n<\/table>\n![\"Image](\"grohtml-1630321.png\")
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CONFORMING TO <\/a> <\/h2>\nThe functions clearerr<\/b>(), feof<\/b>(), and ferror<\/b>() conform to C89, C99, POSIX.1-2001, and POSIX.1-2008.<\/p>\n
The function fileno<\/b>() conforms to POSIX.1-2001 and POSIX.1-2008.<\/p>\nSEE ALSO <\/a> <\/h2>\n
#include void clearerr(FILE *<\/b>stream<\/i>);<\/b><\/p>\n int feof(FILE *<\/b>stream<\/i>);<\/b><\/p>\n int ferror(FILE *<\/b>stream<\/i>);<\/b><\/p>\n int fileno(FILE *<\/b>stream<\/i>);<\/b><\/p>\n Feature Test Macro Requirements for glibc (see feature_test_macros<\/b>(7)):<\/p>\n fileno<\/b>(): _POSIX_C_SOURCE<\/p>\n The function clearerr<\/b>() clears the end-of-file and error indicators for the stream pointed to by stream<\/i>.<\/p>\n The function feof<\/b>() tests the end-of-file indicator for the stream pointed to by stream<\/i>, returning nonzero if it is set. The end-of-file indicator can be cleared only by the function clearerr<\/b>().<\/p>\n The function ferror<\/b>() tests the error indicator for the stream pointed to by stream<\/i>, returning nonzero if it is set. The error indicator can be reset only by the clearerr<\/b>() function.<\/p>\n The function fileno<\/b>() examines the argument stream<\/i> and returns the integer file descriptor used to implement this stream. The file descriptor is still owned by stream<\/i> and will be closed when fclose<\/b>(3) is called. Duplicate the file descriptor with dup<\/b>(2) before passing it to code that might close it.<\/p>\n For nonlocking counterparts, see unlocked_stdio<\/b>(3).<\/p>\n These functions should not fail and do not set the external variable errno<\/i>. (However, in case fileno<\/b>() detects that its argument is not a valid stream, it must return \u22121 and set errno<\/i> to EBADF<\/b>.)<\/p>\n For an explanation of the terms used in this section, see attributes<\/b>(7).<\/p>\n The functions clearerr<\/b>(), feof<\/b>(), and ferror<\/b>() conform to C89, C99, POSIX.1-2001, and POSIX.1-2008.<\/p>\n The function fileno<\/b>() conforms to POSIX.1-2001 and POSIX.1-2008.<\/p>\nDESCRIPTION <\/a> <\/h2>\n
ERRORS <\/a> <\/h2>\n
ATTRIBUTES <\/a> <\/h2>\n
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\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n<\/table>\n <\/p>\nCONFORMING TO <\/a> <\/h2>\n
SEE ALSO <\/a> <\/h2>\n