getpt(3) Library Functions Manual getpt(3) NAME getpt - open a new pseudoterminal master LIBRARY Standard C library (libc, -lc) SYNOPSIS #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int getpt(void); DESCRIPTION getpt() opens a new pseudoterminal device and returns a file descriptor that refers to that device. It is equivalent to opening the pseudoterminal multiplexor device open("/dev/ptmx", O_RDWR); on Linux systems, though the pseudoterminal multiplexor device is located elsewhere on some systems that use the GNU C li‐ brary. RETURN VALUE getpt() returns an open file descriptor upon successful completion. Otherwise, it returns -1 and sets errno to indicate the error. ERRORS getpt() can fail with various errors described in open(2). VERSIONS getpt() is provided since glibc 2.1. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤ │getpt() │ Thread safety │ MT-Safe │ └─────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘ STANDARDS getpt() is glibc-specific; use posix_openpt(3) instead. SEE ALSO grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7) Linux man-pages 6.03 2022-12-15 getpt(3)