bionic (3) isatty.3.gz

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NAME
       isatty - test whether a file descriptor refers to a terminal


SYNOPSIS
       #include <unistd.h>

       int isatty(int fd);


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


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.


ERRORS
       EBADF  fd is not a valid file descriptor.

       EINVAL fd refers to a file other than a terminal.  POSIX.1 specifies the error ENOTTY for this case.


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

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

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


SEE ALSO
       fstat(2), ttyname(3)


COLOPHON
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