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).
ATTRIBUTES
For an explanation of the terms used in this section, see attrib-
utes(7).
┌───────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────────────────┼───────────────┼─────────┤
│ getpt() │ Thread safety │ MT-Safe │
└───────────────────────────────────────────┴───────────────┴─────────┘
VERSIONS
Use posix_openpt(3) instead.
STANDARDS
GNU.
HISTORY
glibc 2.1.
SEE ALSO
grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
Linux man-pages 6.7 2023-10-31 getpt(3)
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