The Single UNIX ® Specification, Version 2
Copyright © 1997 The Open Group

 NAME

isastream - test a file descriptor

 SYNOPSIS



#include <stropts.h>

int isastream(int fildes);

 DESCRIPTION

The isastream() function tests whether fildes, an open file descriptor, is associated with a STREAMS-based file.

 RETURN VALUE

Upon successful completion, isastream() returns 1 if fildes refers to a STREAMS-based file and 0 if not. Otherwise, isastream() returns -1 and sets errno to indicate the error.

 ERRORS

The isastream() function will fail if:
[EBADF]
The fildes argument is not a valid open file descriptor.

 EXAMPLES

None.

 APPLICATION USAGE

None.

 FUTURE DIRECTIONS

None.

 SEE ALSO

<stropts.h>.

UNIX ® is a registered Trademark of The Open Group.
Copyright © 1997 The Open Group
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