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



NAME
       getttyent, getttynam, setttyent, endttyent - get ttys file entry

SYNOPSIS
       #include <ttyent.h>

       struct ttyent *getttyent(void);

       struct ttyent *getttynam(const char *name);

       int setttyent(void);

       int endttyent(void);

DESCRIPTION
       These functions provide an interface to the file _PATH_TTYS (e.g., /etc/ttys).

       The function setttyent() opens the file or rewinds it if already open.

       The function endttyent() closes the file.

       The  function  getttynam()  searches  for a given terminal name in the file.  It returns a
       pointer to a ttyent structure (description below).

       The function getttyent() opens the file _PATH_TTYS (if necessary) and  returns  the  first
       entry.  If the file is already open, the next entry.  The ttyent structure has the form:

           struct ttyent {
               char *ty_name;     /* terminal device name */
               char *ty_getty;    /* command to execute, usually getty */
               char *ty_type;     /* terminal type for termcap */
               int   ty_status;   /* status flags */
               char *ty_window;   /* command to start up window manager */
               char *ty_comment;  /* comment field */
           };

       ty_status can be:

       #define TTY_ON     0x01  /* enable logins (start ty_getty program) */
       #define TTY_SECURE 0x02  /* allow UID 0 to login */

ATTRIBUTES
   Multithreading (see pthreads(7))
       The getttyent() function returns a pointer to a static variable, so it is not thread-safe.

       The  setttyent()  and endttyent() functions use a static variable, so they are not thread-
       safe.

       The getttynam() function calls thread-unsafe function getttyent() so  it  is  not  thread-
       safe.

CONFORMING TO
       Not in POSIX.1-2001.  Present on the BSDs, and perhaps other systems.

NOTES
       Under Linux, the file /etc/ttys, and the functions described above, are not used.

SEE ALSO
       ttyname(3), ttyslot(3)

COLOPHON
       This  page  is  part of release 3.74 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 http://www.kernel.org/doc/man-pages/.



GNU                                         2013-07-22                               GETTTYENT(3)