Manpage of GETPT
GETPTSection: Linux Programmer's Manual (3)
NAMEgetpt - open the pseudoterminal master (PTM)
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h>int getpt(void);
DESCRIPTIONgetpt() 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.
RETURN VALUEgetpt() returns an open file descriptor upon successful completion. Otherwise, it returns -1 and sets errnoto indicate the error.
ERRORSgetpt() can fail with various errors described in open(2).
VERSIONSgetpt() is provided in glibc since version 2.1.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOgetpt() is glibc-specific; use posix_openpt(3) instead.
SEE ALSOgrantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
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