getttyent(3) — Linux manual page

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(),          │ Thread safety │ MT-Unsafe race:ttyent │
       │ setttyent(),          │               │                       │
       │ 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)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                   getttyent(3)

Pages that refer to this page: ttyslot(3)

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