How does the libc function isatty() work?

How does the libc function isatty() work?

c unix libc

unix

bus error when trying to access character on a string in C

c linux unix libc

unix

How do you write to a pty master Rust

unix rust libc tty pty

unix

Is the default locale of a program in *nix "posix"?

c linux unix libc

unix

How to do the equivalent of "ulimit -n 400" from within C?

c linux unix glibc libc

unix

Are libc and malloc part of the operating system?

c unix operating-system malloc libc

unix

Capturing stdout/stderr separately and simultaneously from child process results in wrong total order (libc/unix)

c unix pipe posix libc

unix