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

       ┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬───────────────────────┐
       │Interface                                                                                                               │ Attribute     │ Value                 │
       ├────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼───────────────────────┤
       │getttyent(), setttyent(), endttyent(), getttynam()                                                                      │ Thread safety │ MT-Unsafe race:ttyent │
       └────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴───────────────────────┘

CONFORMING TO
       Not in POSIX.1.  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)

GNU                                                                            2021-03-22                                                                   GETTTYENT(3)