Linux manual pages Section 3: Subroutines  

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/.


   Copyright 2002 walter harms (walter.harmsinformatik.uni-oldenburg.de)

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