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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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ptsname(3) Library Functions Manual ptsname(3)
ptsname, ptsname_r - get the name of the slave pseudoterminal
Standard C library (libc, -lc)
#include <stdlib.h>
char *ptsname(int fd);
int ptsname_r(size_t size;
int fd, char buf[size], size_t size);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
ptsname():
Since glibc 2.24:
_XOPEN_SOURCE >= 500
glibc 2.23 and earlier:
_XOPEN_SOURCE
ptsname_r():
_GNU_SOURCE
The ptsname() function returns the name of the slave
pseudoterminal device corresponding to the master referred to by
the file descriptor fd.
The ptsname_r() function is the reentrant equivalent of ptsname().
It returns the name of the slave pseudoterminal device as a null-
terminated string in the buffer pointed to by buf. The size
argument specifies the number of bytes available in buf.
On success, ptsname() returns a pointer to a string in static
storage which will be overwritten by subsequent calls. This
pointer must not be freed. On failure, NULL is returned.
On success, ptsname_r() returns 0. On failure, an error number is
returned to indicate the error.
EINVAL (ptsname_r() only) buf is NULL. (This error is returned
only for glibc 2.25 and earlier.)
ENOTTY fd does not refer to a pseudoterminal master device.
ERANGE (ptsname_r() only) buf is too small.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────┬───────────────┬────────────────────────┐
│ Interface │ Attribute │ Value │
├───────────────────────┼───────────────┼────────────────────────┤
│ ptsname() │ Thread safety │ MT-Unsafe race:ptsname │
├───────────────────────┼───────────────┼────────────────────────┤
│ ptsname_r() │ Thread safety │ MT-Safe │
└───────────────────────┴───────────────┴────────────────────────┘
A version of ptsname_r() is documented on Tru64 and HP-UX, but on
those implementations, -1 is returned on error, with errno set to
indicate the error. Avoid using this function in portable
programs.
ptsname():
POSIX.1-2008.
ptsname_r() is a Linux extension, that is proposed for inclusion
in the next major revision of POSIX.1 (Issue 8).
ptsname():
POSIX.1-2001. glibc 2.1.
ptsname() is part of the UNIX 98 pseudoterminal support (see
pts(4)).
grantpt(3), posix_openpt(3), ttyname(3), unlockpt(3), pts(4),
pty(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2025-08-11. If you discover any rendering problems in this HTML
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part of the original manual page), send a mail to
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Linux man-pages 6.15 2025-06-28 ptsname(3)
Pages that refer to this page: TIOCPKT(2const), getpt(3), grantpt(3), posix_openpt(3), unlockpt(3), pts(4), pty(7)
Copyright and license for this manual page
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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