ferror - Man Page

test error indicator on a stream

Prolog

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

Synopsis

#include <stdio.h>

int ferror(FILE *stream);

Description

The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard.

The ferror() function shall test the error indicator for the stream pointed to by stream.

The ferror() function shall not change the setting of errno if stream is valid.

Return Value

The ferror() function shall return non-zero if and only if the error indicator is set for stream.

Errors

No errors are defined.

The following sections are informative.

Examples

None.

Application Usage

None.

Rationale

None.

Future Directions

None.

See Also

clearerr(), feof(), fopen()

The Base Definitions volume of POSIX.1-2017, <stdio.h>

Referenced By

feof(3p), fgetc(3p), fgetwc(3p), fputc(3p), fputwc(3p), fread(3p), fwrite(3p), gets(3p), stdin(3p), stdio.h(0p).

2017 IEEE/The Open Group POSIX Programmer's Manual