getttyent(3) - BetterMan

—

NAME

getttyent, getttynam, setttyent, endttyent - get ttys file entry

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

bash

#include <ttyent.h>

bash

struct ttyent *getttyent(void);\n
\nstruct ttyent *getttynam(const char *\nname\n);

bash

int setttyent(void);\n
\nint 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:

bash

struct ttyent {
\n
    char *ty_name;     /* terminal device name */
\n
    char *ty_getty;    /* command to execute, usually getty */
\n
    char *ty_type;     /* terminal type for termcap */
\n
    int   ty_status;   /* status flags */
\n
    char *ty_window;   /* command to start up window manager */
\n
    char *ty_comment;  /* comment field */
};

ty_status can be:

bash

#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

STANDARDS

BSD.

NOTES

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