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.
getpt() can fail with various errors described in open(2).
getpt() is provided in glibc since version 2.1.
The getpt() function is thread-safe.
getpt() is glibc-specific; use posix_openpt(3) instead.
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