Open Source Software

ctermid(3)



NAME

   ctermid - get controlling terminal name

SYNOPSIS

   #include <stdio.h>

   char *ctermid(char *s);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   ctermid(): _POSIX_C_SOURCE

DESCRIPTION

   ctermid()  returns  a  string  which  is  the  pathname for the current
   controlling terminal for this process.  If s is NULL, a  static  buffer
   is  used,  otherwise  s  points  to  a buffer used to hold the terminal
   pathname.  The symbolic constant L_ctermid is  the  maximum  number  of
   characters in the returned pathname.

RETURN VALUE

   The pointer to the pathname.

ATTRIBUTES

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface  Attribute      Value   
   
   ctermid()  Thread safety  MT-Safe

CONFORMING TO

   POSIX.1-2001, POSIX.1-2008, Svr4.

BUGS

   The path returned may not uniquely identify the  controlling  terminal;
   it may, for example, be /dev/tty.

   It is not assured that the program can open the terminal.

SEE ALSO

   ttyname(3)

COLOPHON

   This  page  is  part of release 4.09 of the Linux man-pages project.  A
   description of the project, information about reporting bugs,  and  the
   latest     version     of     this    page,    can    be    found    at
   https://www.kernel.org/doc/man-pages/.



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