ptsname(3C)                                                     ptsname(3C)


   NAME
         ptsname - get name of the slave pseudo-terminal device

   SYNOPSIS
         #include <stdio.h>

         char *ptsname(int fildes);

   DESCRIPTION
         The function ptsname() returns the name of the slave pseudo-terminal
         device associated with a master pseudo-terminal device.  fildes is a
         file descriptor returned from a successful open of the master device.
         ptsname() returns a pointer to a string containing the null-
         terminated path name of the slave device of the form /dev/pts/N,
         where N is an integer between 0 and 255.

   RETURN VALUE
         Upon successful completion, the function ptsname() returns a pointer
         to a string which is the name of the pseudo-terminal slave device.
         This value points to a static data area that is overwritten by each
         call to ptsname().  Upon failure, ptsname() returns NULL.  This could
         occur if fildes is an invalid file descriptor or if the slave device
         name does not exist in the file system.

   SEE ALSO
         open(2), grantpt(3C), ttyname(3C), unlockpt(3C).
         Programmer's Guide: STREAMS.


























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