Linux 2.6 - man page for getpt (linux section 3)
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GETPT(3) Linux Programmer's Manual GETPT(3)
getpt - open the pseudoterminal master (PTM)
#define _GNU_SOURCE /* See feature_test_macros(7) */
getpt() opens a pseudoterminal master and returns its file descriptor. It is equivalent
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.
getpt() can fail with various errors described in open(2).
getpt() is provided in glibc since version 2.1.
getpt() is glibc-specific; use posix_openpt(3) instead.
grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
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GNU 2010-09-10 GETPT(3)
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