ptsname, ptsname_r — get the name of the slave pseudo-terminal
#define _XOPEN_SOURCE #include <stdlib.h>
char
*ptsname( |
int | fd); |
#define _GNU_SOURCE #include <stdlib.h>
char
*ptsname_r( |
int | fd, |
| char * | buf, | |
| size_t | buflen); |
The ptsname() function
returns the name of the slave pseudo-terminal (pty) 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
pseudo-terminal 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, a NULL pointer is returned.
On success, ptsname_r()
returns 0. On failure, a nonzero value is returned and
errno is set to indicate the
error.
(ptsname_r() only)
buf is
NULL.
fd does not
refer to a pseudo-terminal master device.
(ptsname_r() only)
buf is too
small.
ptsname() is part of the
Unix98 pseudo-terminal support (see pts(4)). This function is
specified in POSIX.1-2001.
ptsname_r() is a Linux
extension. 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), feature_test_macros(7), pty(7)