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isastream(3)
NAME
  isastream - Determines if a file descriptor refers to a STREAMS file

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

SYNOPSIS
  #include <stropts.h>
  int isastream(
	  int fildes);

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

  isastream():	XPG4-UNIX

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

PARAMETERS
  fildes    Specifies a file descriptor of an open STREAMS file.

DESCRIPTION
  The isastream() function tests whether a file descriptor it encounters is
  actually a STREAMS file.

RETURN VALUES
  Upon successful completion, the isastream() function returns a value of 1
  when the file descriptor of the open file specified by fildes is a STREAMS
  file, and it returns a value of 0 (zero) if it is not a STREAMS file.
  Otherwise, a value of -1 is returned, and errno is set to indicate the
  error.

ERRORS
  If any of the following conditions occur, the isastream() function sets
  errno to the corresponding value:

  [EBADF]   The specified file descriptor does not refer to a valid open
	    file.

RELATED INFORMATION
  Functions: fattach(3), fdetach(3)

  Interfaces: streamio(7)

  Standards: standards(5)