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   isatty    ( 3 )

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Имя (Name)

isatty - test whether a file descriptor refers to a terminal

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Синопсис (Synopsis)

#include <unistd.h>

       int isatty(int fd);

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Описание (Description)

The isatty() function tests whether fd is an open file descriptor
       referring to a terminal.

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Возвращаемое значение (Return value)

isatty() returns 1 if fd is an open file descriptor referring to
       a terminal; otherwise 0 is returned, and errno is set to indicate
       the error.

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Ошибки (Error)

EBADF  fd is not a valid file descriptor.

       ENOTTY fd refers to a file other than a terminal.  On some older
              kernels, some types of files resulted in the error EINVAL
              in this case (which is a violation of POSIX, which
              specifies the error ENOTTY).

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Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │isatty()                              │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

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Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.

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Смотри также (See also)

fstat(2), ttyname(3)

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