Manpages - getttyent.3

Table of Contents

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

For an explanation of the terms used in this section, see *attributes*(7).

Interface Attribute Value
*getttyent*(), *setttyent*(), *endttyent*(), *getttynam*() Thread safety MT-Unsafe race:ttyent

CONFORMING TO

Not in POSIX.1. 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 5.13 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/.

Author: dt

Created: 2022-02-20 Sun 15:18