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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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ISATTY(3) Linux Programmer's Manual ISATTY(3)
isatty - test whether a file descriptor refers to a terminal
#include <unistd.h>
int isatty(int fd);
The isatty() function tests whether fd is an open file descriptor
referring to a terminal.
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.
EBADF fd is not a valid file descriptor.
ENOTTY fd refers to a file other than a terminal. On some older
kernels, some types of files resulted in the error EINVAL in
this case (which is a violation of POSIX, which specifies the
error ENOTTY).
For an explanation of the terms used in this section, see
attributes(7).
┌──────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────┼───────────────┼─────────┤
│isatty() │ Thread safety │ MT-Safe │
└──────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
fstat(2), ttyname(3)
This page is part of release 5.00 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)
Pages that refer to this page: bash(1), ttyname(3)
Copyright and license for this manual page
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HTML rendering created 2019-03-06 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.
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