NAME
isatty - test whether a file descriptor refers to a terminal SYNOPSIS
#include
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. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────┼───────────────┼─────────┤
│isatty() │ Thread safety │ MT-Safe │ └──────────┴───────────────┴─────────┘ CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001. SEE ALSO fstat(2), ttyname(3) COLOPHON
This page is part of release 3.53 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)