NAME

isastream - Determines if a file descriptor refers to a STREAMS file

LIBRARY

Standard C Library (libc.a)

SYNOPSIS

int isastream(
int fildes);

PARAMETERS

fildesSpecifies 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).