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GETTTYENT(3) Linux Programmer's Manual GETTTYENT(3)
getttyent, getttynam, setttyent, endttyent - get ttys file entry
#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(), │ Thread safety │ MT-Unsafe race:ttyent │ │setttyent(), │ │ │ │endttyent(), │ │ │ │getttynam() │ │ │ └────────────────────────┴───────────────┴───────────────────────┘
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)
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GNU 2021-03-22 GETTTYENT(3)
Pages that refer to this page: ttyslot(3)
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