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 pseudoter-
minal multiplexor device
open("/dev/ptmx", O_RDWR);
on Linux systems, though the pseudoterminal multiplexor device is lo-
cated elsewhere on some systems that use the GNU C library.
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 at-
tributes(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)
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