isatty - Man Page
test whether a file descriptor refers to a terminal
Library
Standard C library (libc, -lc)
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 terminal; otherwise 0 is returned, and errno is set to indicate the error.
Errors
Attributes
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
---|---|---|
isatty() | Thread safety | MT-Safe |
Standards
POSIX.1-2008.
History
POSIX.1-2001, SVr4, 4.3BSD.
See Also
Referenced By
bash(1), cdecl(1), clush(1), mailcap(5), rc(1), tcpslice(8), tickit_term_build(3), ttyname(3).
2024-05-02 Linux man-pages 6.9.1