getttyent(3) Library Functions Manual getttyent(3)

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

Standard C library (libc, -lc)

#include <ttyent.h>
struct ttyent *getttyent(void);
struct ttyent *getttynam(const char *name);
int setttyent(void);
int endttyent(void);

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 */

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

Not in POSIX.1. Present on the BSDs, and perhaps other systems.

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

ttyname(3), ttyslot(3)

2022-12-15 Linux man-pages 6.02