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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
       referring 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.

       EINVAL fd refers to a file other than a terminal.  POSIX.1-2001  speci-
              fies 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 3.25 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/.

Linux                             2008-12-03                         ISATTY(3)
 

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Gedruckt am: 17.12.2017 15:04 GMT+0100 (2017-12-17T15:04:17+01:00)