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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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PTSNAME(3) Linux Programmer's Manual PTSNAME(3)
ptsname, ptsname_r - get the name of the slave pseudoterminal
#include <stdlib.h>
char *ptsname(int fd);
int ptsname_r(int fd, char *buf, size_t buflen);
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 buflen 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.
ptsname() is provided in glibc since version 2.1.
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 │
└───────────────────────┴───────────────┴────────────────────────┘
ptsname():
POSIX.1-2001, POSIX.1-2008.
ptsname() is part of the UNIX 98 pseudoterminal support (see
pts(4)).
ptsname_r() is a Linux extension, that is proposed for inclusion
in the next major revision of POSIX.1 (Issue 8). A version of
this function 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.
grantpt(3), posix_openpt(3), ttyname(3), unlockpt(3), pts(4),
pty(7)
This page is part of release 5.13 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2021-03-22 PTSNAME(3)
Pages that refer to this page: ioctl_tty(2), getpt(3), grantpt(3), posix_openpt(3), unlockpt(3), pts(4), pty(7)
Copyright and license for this manual page
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