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getttyent(3)							  getttyent(3)

NAME
       getttyent, getttyent_r, getttynam, getttynam_r, setttyent, setttyent_r,
       endttyent, endttyent_r - Get a /etc/securettys file entry

SYNOPSIS
       #include <ttyent.h>

       struct ttyent *getttyent(
	       void ); struct ttyent *getttynam(
	       const char *name ); int setttyent(
	       void ); void endttyent(
	       void );

       The following obsolete functions are supported  in  order  to  maintain
       backward	 compatibility with previous versions of the operating system.
       You should not use them in new designs.	int getttyent_r(
	       struct ttyent *tte,
	       char *buf,
	       int len,
	       FILE **tty_fp ); int getttynam_r(
	       const char *name,
	       struct ttyent *tte,
	       char *buf,
	       int len ); int setttyent_r(
	       FILE **tty_fp ); void endttyent_r(
	       FILE **tty_fp );

LIBRARY
       Standard C Library (libc)

PARAMETERS
       Points to the ttyent structure. The ttyent.h header  file  defines  the
       ttyent structure.  Specifies the name of the requested tty description.
       Is data for the tty.  Specifies the length of buf.  Specifies a	secure
       ttys file stream.

DESCRIPTION
       The  getttyent()	 and getttynam() functions each return a pointer to an
       object that has the following ttyent fields. These  fields  describe  a
       line from the secure tty description file.

       The members of the structure include the following: Name of the charac‐
       ter-special file.  The string "none".  The string "none".   A  mask  of
       bit  fields.  The TTY_SECURE option indicates users with a user ID of 0
       (zero) are allowed to log in on this terminal.  A NULL pointer  A  NULL
       pointer.

       If  any	of  the	 fields pointing to character strings are unspecified,
       they are returned as NULL pointers.  The	 field	ty_status  will	 be  0
       (zero) if root logins are not allowed.

       The getttyent() function reads the next line from the tty file, opening
       the file if necessary. The setttyent() function	rewinds	 the  file  if
       open,  or  opens	 the  file if it is unopened. The endttyent() function
       closes any open files.

       The getttynam() function searches from the beginning of the file	 until
       a matching name is found or until EOF (End-Of-File) is encountered.

NOTES
       The  getttyent(),  setttyent(),	endttyent(), and getttynam() functions
       return a pointer to thread-specific data.  Subsequent  calls  to	 these
       functions from the same thread overwrite this data.

       The  getttyent_r(),  setttyent_r(),  endttyent_r(),  and	 getttynam_r()
       functions are obsolete reentrant versions of these functions. They  are
       supported  in  order  to	 maintain backward compatibility with previous
       versions of the operating system and should not be used in new designs.
       Note  that you must initialize the *tty_fp parameter to NULL before its
       first access by any of these functions.

RETURN VALUES
       Upon successful completion, the getttyent() and	getttynam()  functions
       return  a  pointer to a ttyent structure. If they fail or reach the end
       of the terminal control database file, they return a null pointer.

       Upon successful completion, the setttyent() function returns a value of
       1. Upon failure, it returns a value of 0 (zero).

       Upon  successful	 completion, the getttyent_r() and getttynam_r() func‐
       tions store the ttyent structure in the location pointed to by tte, and
       return a value of 0 (zero). Upon failure, they return a value of -1.

       Upon  successful completion, the setttyent_r() function returns a value
       of 0 (zero). Upon failure, it returns a value of -1.

ERRORS
       If any of the following conditions occurs, the getttyent_r() or gettty‐
       nam_r()	functions  set	errno  to  the corresponding value: The search
       failed.

       In addition, if any of  the  following  conditions  occurs,  the	 gett‐
       tyent_r()  or  setttyent_r()  functions	set errno to the corresponding
       value: The tty_fp, tte, or buf parameter is invalid, or the len parame‐
       ter is too small.

FILES
       /etc/securettys Contains the terminal control database file.

SEE ALSO
       Commands: login(1)

       Files: securettys(4).

								  getttyent(3)
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