NAME
isatty – test whether a file descriptor refers to a terminalSYNOPSIS
#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
- EBADF
- fd is not a valid file descriptor.
- EINVAL
- fd refers to a file other than a terminal. POSIX.1-2001 specifies the error ENOTTY for this case.
ATTRIBUTES
Multithreading (see pthreads(7))
The isatty() function is thread-safe.CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
Willie
Willie has over 15 years of experience in Linux system administration and DevOps. After managing infrastructure for startups and enterprises alike, he founded Command Linux to share the practical knowledge he wished he had when starting out. He oversees content strategy and contributes guides on server management, automation, and security.