Get the name of the slave pseudoterminal
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.
(ptsname_r() only) buf is NULL.
fd does not refer to a pseudoterminal master device.
(ptsname_r() only) buf is too small.
ptsname() is provided in glibc since version 2.1.
The ptsname() function is not thread-safe.
The ptsname_r() function is thread-safe.
ptsname() is part of the UNIX 98 pseudoterminal 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.
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