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 ||
(_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
Glibc 2.23 and earlier:
_XOPEN_SOURCE
():
_GNU_SOURCE
The
ptsname() function returns the name of the slave pseudoterminal
device corresponding to the master referred to by
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, a nonzero value is
returned and
errno is set 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)