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Linux 2.6 - man page for unlockpt (linux section 3)

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UNLOCKPT(3)			    Linux Programmer's Manual			      UNLOCKPT(3)

NAME
       unlockpt - unlock a pseudoterminal master/slave pair

SYNOPSIS
       #define _XOPEN_SOURCE	   /* See feature_test_macros(7) */
       #include <stdlib.h>

       int unlockpt(int fd);

DESCRIPTION
       The  unlockpt() function unlocks the slave pseudoterminal device corresponding to the mas-
       ter pseudoterminal referred to by fd.

       unlockpt() should be called before opening the slave side of a pseudoterminal.

RETURN VALUE
       When successful, unlockpt() returns 0.  Otherwise, it returns -1 and sets errno	appropri-
       ately.

ERRORS
       EBADF  The fd argument is not a file descriptor open for writing.

       EINVAL The fd argument is not associated with a master pseudoterminal.

VERSIONS
       unlockpt() is provided in glibc since version 2.1.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The unlockpt() function is thread-safe.

CONFORMING TO
       POSIX.1-2001.

SEE ALSO
       grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

					    2013-12-09				      UNLOCKPT(3)
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