getpt - open the pseudoterminal master (PTM)
#define _GNU_SOURCE /* See feature_test_macros(7) */
() 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.
() returns an open file descriptor upon successful completion.
Otherwise, it returns -1 and sets errno
to indicate the error.
() can fail with various errors described in open(2)
() is provided in glibc since version 2.1.
Multithreading (see pthreads(7))¶
() function is thread-safe.
() is glibc-specific; use posix_openpt(3)
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