Index for Section 3

Alphabetical listing for U

Bottom of page

unlockpt(3)
NAME
  unlockpt - Unlock a pseudoterminal master and slave pair

SYNOPSIS
  #include <stdlib.h>

  int unlockpt(
	  int mastfd );

LIBRARY
  Standard C Library (libc)

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  unlockpt(): XSH5.0

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  mastfd
      Specifies a file descriptor that is returned from a successful open of
      the master pseudoterminal device.

DESCRIPTION
  The unlockpt() function unlocks a slave pseudoterminal from its associated
  master counterpart. It does this by clearing a lock option so that the
  slave device can be opened.

ERRORS
  The unlockpt() function sets errno to the specified values for the
  following conditions:

  [EBADF]
      The file descriptor specified by the mastfd parameter is not an open
      file descriptor.

  [EINVAL]
      The file descriptor specified by the mastfd parameter is not associated
      with a master pseudoterminal device.

RETURN VALUE
  Upon successful completion, the unlockpt() function returns a value of 0.
  Otherwise, it returns a value of -1 and sets errno to indicate the error.

SEE ALSO
  Functions: openpty(3)

  Standards: standards(5)

Index for Section 3

Alphabetical listing for U

Top of page