NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

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

SYNOPSIS         top

       #include <ttyent.h>

       struct ttyent *getttyent(void);

       struct ttyent *getttynam(const char *name);

       int setttyent(void);

       int endttyent(void);

DESCRIPTION         top

       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         top

       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         top

       Not in POSIX.1.  Present on the BSDs, and perhaps other systems.

NOTES         top

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

SEE ALSO         top

       ttyname(3), ttyslot(3)

COLOPHON         top

       This page is part of release 4.08 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
       https://www.kernel.org/doc/man-pages/.

GNU                              2015-03-02                     GETTTYENT(3)