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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 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
   Multithreading (see pthreads(7))
       The  getttyent() function returns a pointer to a static variable, so it
       is not thread-safe.
       The setttyent() and endttyent() functions use  a  static  variable,  so
       they are not thread-safe.
       The getttynam() function calls thread-unsafe function getttyent() so it
       is not thread-safe.
CONFORMING TO
       Not in POSIX.1-2001.  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
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU                               2013-07-22                      GETTTYENT(3)