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isatty(3)

ISATTY(3)                  Linux Programmer's Manual                 ISATTY(3)

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 re‐
       ferring to a terminal.

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

ERRORS
       EBADF  fd is not a valid file descriptor.

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

ATTRIBUTES
       For  an  explanation  of  the  terms  used in this section, see attrib‐
       utes(7).  allbox;  lb  lb  lb  l  l  l.   Interface Attribute Value  T{
       isatty() T}   Thread safety  MT-Safe

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

SEE ALSO
       fstat(2), ttyname(3)

COLOPHON
       This  page  is  part of release 5.02 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.

Linux                             2019-03-06                         ISATTY(3)
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