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PTSNAME(3)		 BSD Library Functions Manual		    PTSNAME(3)

NAME
     ptsname — get the pathname of the slave pseudo-terminal device

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     char *
     ptsname(int masterfd);

DESCRIPTION
     The ptsname() function returns the pathname of the slave pseudo-terminal
     device that corresponds to the master pseudo-terminal device associated
     with masterfd.  The ptsname() function is not reentrant or thread-safe.

RETURN VALUES
     If successful, ptsname() returns a pointer to a nul-terminated string
     containing the pathname of the slave pseudo-terminal device.  If an error
     occurs ptsname() will return NULL and errno is set to indicate the error.

ERRORS
     The ptsname() function will fail if:

     [EACCESS]		the corresponding pseudo-terminal device could not be
			accessed.

     [EBADF]		masterfd is not a valid descriptor.

     [EINVAL]		masterfd is not associated with a master pseudo-termi‐
			nal device.

NOTES
     The error returns of ptsname() are a NetBSD extension.  The ptsname()
     function is equivalent to:

	     struct ptmget pm;
	     return ioctl(masterfd, TIOCPTSNAME, &pm) == -1 ? NULL : pm.ps;

SEE ALSO
     ioctl(2), grantpt(3), posix_openpt(3), unlockpt(3)

STANDARDS
     The ptsname() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).  Its
     first release was in X/Open Portability Guide Issue 4, Version 2
     (“XPG4.2”).

BSD				 May 25, 2004				   BSD

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