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 attributes(7).
Interface | Attribute | Value
 | Thread safety | MT-Unsafe race:ttyent

STANDARDS
BSD.

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

SEE ALSO
ttyname(3), ttyslot(3)