isatty(3c) - osol9

1isatty(3C)               Standard C Library Functions               isatty(3C)
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NAME

6       isatty - test for a terminal device
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SYNOPSIS

9       #include <unistd.h>
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11       int isatty(int fildes);
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DESCRIPTION

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

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

23       The isatty() function may fail if:
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25       EBADF     The fildes argument is not a valid open file descriptor.
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28       ENOTTY    The fildes argument is not associated with a terminal.
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USAGE

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

37       See attributes(5) for descriptions of the following attributes:
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42       ┌─────────────────────────────┬─────────────────────────────┐
43       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
44       ├─────────────────────────────┼─────────────────────────────┤
45       │Interface Stability          │Standard                     │
46       ├─────────────────────────────┼─────────────────────────────┤
47       │MT-Level                     │MT-Safe                      │
48       └─────────────────────────────┴─────────────────────────────┘
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