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ctermid(3c)

ctermid(3C)              Standard C Library Functions              ctermid(3C)

NAME
       ctermid, ctermid_r - generate path name for controlling terminal

SYNOPSIS
       #include <stdio.h>

       char *ctermid(char *s);


       char *ctermid_r(char *s);

DESCRIPTION
   ctermid()
       The  ctermid() function generates the path name of the controlling ter‐
       minal for the current process and stores it in a string.


       If s is a null pointer, the string is stored in an internal static area
       whose address is returned and whose contents  are  overwritten  at  the
       next call to ctermid(). Otherwise, s is assumed to point to a character
       array  of  at least L_ctermid elements. The path name is placed in this
       array and the value of s is returned. The constant L_ctermid is defined
       in the header <stdio.h>.

   ctermid_r()
       The ctermid_r() function behaves as ctermid() except that  if  s  is  a
       null pointer, the function returns NULL.

USAGE
       The difference between ctermid() and ttyname(3C) is that ttyname() must
       be passed a file descriptor and returns the actual name of the terminal
       associated  with that file descriptor, while ctermid() returns a string
       (/dev/tty) that will refer to the terminal if used as a file name.  The
       ttyname()  function  is useful only if the process already has at least
       one file open to a terminal.


       The ctermid() function is unsafe  in  multithreaded  applications.  The
       ctermid_r() function is MT-Safe and should be used instead.

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Interface Stabilityctermid() is Standard  _  MT-LevelT{
       ctermid() is Unsafe; ctermid_r() is MT-Safe T}


SEE ALSO
       ttyname(3C), attributes(7)

Oracle Solaris 11.4               20 May 2014                      ctermid(3C)
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