endttyent (3)

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)

Information

Source
Linux kernel
OS/version
GNU
Source updated
September 15, 2017
Page created
February 9, 2018
Page generated
December 2, 2018