getpt - open the pseudoterminal master (PTM)

#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <stdlib.h>

int getpt(void);

getpt() opens a pseudoterminal master and returns its file descriptor. It is equivalent to

open(/dev/ptmx, O_RDWR | O_NOCTTY);

on Linux systems, though the pseudoterminal master is located elsewhere on some systems that use GNU Libc.

getpt() returns an open file descriptor upon successful completion. Otherwise, it returns -1 and sets errno to indicate the error.

grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)