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isatty(3c)

Standard C Library Functions                                        isatty(3C)



NAME
       isatty - test for a terminal device

SYNOPSIS
       #include <unistd.h>

       int isatty(int fildes);

DESCRIPTION
       The isatty() function tests whether fildes, an open file descriptor, is
       associated with a terminal device.

RETURN VALUES
       The isatty() function returns 1 if fildes is associated with  a  termi‐
       nal; otherwise it returns 0 and may set errno to indicate the error.

ERRORS
       The isatty() function may fail if:

       EBADF     The fildes argument is not a valid open file descriptor.


       ENOTTY    The fildes argument is not associated with a terminal.


USAGE
       The  isatty() function does not necessarily indicate that a human being
       is available for interaction via fildes. It is quite possible that non-
       terminal devices are connected to the communications line.

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _  Stan‐
       dardSee standards(7).


SEE ALSO
       ttyname(3C), attributes(7), standards(7)



Oracle Solaris 11.4               24 Jul 2002                       isatty(3C)
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