getpt — open the pseudoterminal master (PTM)
Synopsis
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int getpt(void);
Description
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.
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 in glibc since version 2.1.
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
|---|---|---|
| getpt() | Thread safety | MT-Safe |
Conforming to
getpt() is glibc-specific; use posix_openpt(3) instead.
See Also
grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
Colophon
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