Name
getttyent, getttynam, setttyent, endttyent - get ttys file entryLibrary
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 |
T} | Thread safety | MT-Unsafe race:ttyent |
Standards
BSD.Notes
Under Linux, the file/etc/ttys
, and the functions described above, are not used.