|
NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
|
|
|
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., /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 */
For an explanation of the terms used in this section, see
attributes(7).
┌────────────────────────┬───────────────┬───────────────────────┐
│Interface │ Attribute │ Value │
├────────────────────────┼───────────────┼───────────────────────┤
│getttyent(), │ Thread safety │ MT-Unsafe race:ttyent │
│setttyent(), │ │ │
│endttyent(), │ │ │
│getttynam() │ │ │
└────────────────────────┴───────────────┴───────────────────────┘
Not in POSIX.1. 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 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/.
GNU 2021-03-22 GETTTYENT(3)
Pages that refer to this page: ttyslot(3)
Copyright and license for this manual page
|
HTML rendering created 2022-12-18 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|