getttyent man page on Archlinux

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

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

       #include <ttyent.h>

       struct ttyent *getttyent(void);

       struct ttyent *getttynam(const char *name);

       int setttyent(void);

       int endttyent(void);

       These  functions	 provide  an  interface	 to the file _PATH_TTYS (e.g.,

       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 */

   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.

       Not in POSIX.1-2001.  Present on the BSDs, and perhaps other systems.

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

       ttyname(3), ttyslot(3)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

GNU				  2013-07-22			  GETTTYENT(3)

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