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HP-UX 11i Version 3: February 2007

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isastream() — determine if a file descriptor refers to a STREAMS device or STREAMS-based pipe


#include <stropts.h>

int isastream(int fd);


The isastream() function tests whether an open file descriptor (fd) corresponds to a STREAMS device or STREAMS-based pipe.


Upon successful completion, the isastream() function returns a value of 1 when the file descriptor of the open file specified by fd is a STREAMS device or STREAMS-based pipe, and 0 (zero) if it is not a stream, but is a valid open file descriptor. Otherwise, a value of -1 is returned, and errno is set to indicate the error.


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


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


isastream(): SVID3

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