*** UNIX MANUAL PAGE BROWSER ***

isastream(3) Library Functions Manual 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 stan- dards as follows: isastream(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS 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 indi- cate the error. ERRORS 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. RELATED INFORMATION Functions: fattach(3), fdetach(3) Interfaces: streamio(7) Standards: standards(5) delim off isastream(3)