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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 5.13 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 2021-03-22 ISATTY(3)
Pages that refer to this page: bash(1), ttyname(3)
Copyright and license for this manual page
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