getttyent(3)               Library Functions Manual               getttyent(3)

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

LIBRARY
       Standard C library (libc, -lc)

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

       +------------------------------+---------------+-----------------------+
       |Interface                     | Attribute     | Value                 |
       +------------------------------+---------------+-----------------------+
       |getttyent (), setttyent (),   | Thread safety | MT-Unsafe race:ttyent |
       |endttyent (), getttynam ()    |               |                       |
       +------------------------------+---------------+-----------------------+
STANDARDS
       BSD.

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

SEE ALSO
       ttyname(3), ttyslot(3)

Linux man-pages 6.7               2023-10-31                      getttyent(3)