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ferror(3)
NAME
  ferror - Tests the error indicator on a stream

LIBRARY
  Standard C Library (libc.so, libc.a)

SYNOPSIS
  #include <stdio.h>

  int ferror(
	  FILE *stream);

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  ferror():  XPG4, XPG4-UNIX

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  stream    Specifies the input or output stream.

DESCRIPTION
  The ferror() function tests whether input/output errors have occurred on
  the specified stream.

NOTES
  [Digital]  The ferror() function may be a macro (depending on the compile-
  time definitions used in the source).	 Consequently, you cannot use this
  interface where a function is necessary; for example, a subroutine pointer
  cannot point to it.

RETURN VALUES
  If an I/O error occurred when reading from or writing to the stream
  specified by the stream parameter, a nonzero value is returned.  Otherwise,
  a value of 0 (zero) is returned.

RELATED INFORMATION
  Functions: fopen(3), feof(3), fileno(3), clearerr(3)

  Standards: standards(5)