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ptsname, ptsname_r - get the name of the slave pseudo-terminal
char *ptsname(int fd);
int 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 non-zero value is
returned and errno is set to indicate the error.
EINVAL (ptsname_r() only) buf is NULL.
ENOTTY fd does not refer to a pseudo-terminal master device.
ERANGE (ptsname_r() only) buf is too small.
ptsname() is provided in glibc since version 2.1.
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),
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