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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ATTRIBUTES | STANDARDS | NOTES | SEE ALSO | COLOPHON |
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getttyent(3) Library Functions Manual getttyent(3)
getttyent, getttynam, setttyent, endttyent - get ttys file entry
Standard C library (libc, -lc)
#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() │ │ │
└────────────────────────┴───────────────┴───────────────────────┘
BSD.
Under Linux, the file /etc/ttys, and the functions described
above, are not used.
ttyname(3), ttyslot(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 getttyent(3)
Pages that refer to this page: ttyslot(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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