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

       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()  │               │                       │
       └──────────────────────────┴───────────────┴───────────────────────┘

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)

COLOPHON

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       found at https://www.kernel.org/doc/man-pages/.