isastream - test a file descriptor
#include <stropts.h> int isastream(int fildes);
The isastream() function determines if a file descriptor represents a STREAMS file. The fildes argument refers to an open file descriptor.
Upon successful completion, isastream() returns 1 if fildes represents a STREAMS file, and 0 if it does not. Otherwise, -1 is return and errno is set to indicate the error.
The isastream() function will fail if:
EBADF
See attributes(5) for descriptions of the following attributes:
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attributes(5), , standards(5), streamio(7I)
STREAMS Programming Guide
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