getttyent(3) Library Functions Manual getttyent(3)
NAME
getttyent, getttynam, setttyent, endttyent - get ttys file entry
LIBRARY
Standard C library (libc, -lc)
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 at-
tributes(7).
┌──────────────────────────────┬───────────────┬───────────────────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────┼───────────────┼───────────────────────┤
│getttyent(), setttyent(), │ Thread safety │ MT-Unsafe race:ttyent │
│endttyent(), getttynam() │ │ │
└──────────────────────────────┴───────────────┴───────────────────────┘
STANDARDS
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)
Linux man-pages 6.03 2022-12-15 getttyent(3)
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