trusty (3) isatty.3.gz

Provided by: manpages-dev_3.54-1ubuntu1_all bug

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.1-2001 specifies the error ENOTTY for this case.


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


SEE ALSO
       fstat(2), ttyname(3)


COLOPHON
       This page is part of release 3.54 of the Linux man-pages project.  A  description  of  the  project,  and
       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.