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getttyent

Section: C Library Functions (3)
Updated: 202-0-08
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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 attributes(7).

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

STANDARDS

BSD.

NOTES

Under Linux, the file /etc/ttys, and the functions described above, are not used.