1GETTTYENT(3)               Linux Programmer's Manual              GETTTYENT(3)
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NAME

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

9       #include <ttyent.h>
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11       struct ttyent *getttyent(void);
12       struct ttyent *getttynam(const char *name);
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14       int setttyent(void);
15       int endttyent(void);
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DESCRIPTION

18       These  functions  provide  an  interface  to the file _PATH_TTYS (e.g.,
19       /etc/ttys).
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21       The function setttyent() opens the file or rewinds it if already open.
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23       The function endttyent() closes the file.
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25       The function getttynam() searches for a  given  terminal  name  in  the
26       file.  It returns a pointer to a ttyent structure (description below).
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28       The  function  getttyent() opens the file _PATH_TTYS (if necessary) and
29       returns the first entry.  If the file is already open, the next  entry.
30       The ttyent structure has the form:
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32           struct ttyent {
33               char *ty_name;     /* terminal device name */
34               char *ty_getty;    /* command to execute, usually getty */
35               char *ty_type;     /* terminal type for termcap */
36               int   ty_status;   /* status flags */
37               char *ty_window;   /* command to start up window manager */
38               char *ty_comment;  /* comment field */
39           };
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41       ty_status can be:
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43           #define TTY_ON     0x01  /* enable logins (start ty_getty program) */
44           #define TTY_SECURE 0x02  /* allow UID 0 to login */
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ATTRIBUTES

47       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
48       tributes(7).
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50       ┌──────────────────────────────┬───────────────┬───────────────────────┐
51       │Interface                     │ Attribute     │ Value                 │
52       ├──────────────────────────────┼───────────────┼───────────────────────┤
53       │getttyent(), setttyent(),     │ Thread safety │ MT-Unsafe race:ttyent │
54       │endttyent(), getttynam()      │               │                       │
55       └──────────────────────────────┴───────────────┴───────────────────────┘
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CONFORMING TO

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

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

65       ttyname(3), ttyslot(3)
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COLOPHON

68       This page is part of release 5.12 of the Linux  man-pages  project.   A
69       description  of  the project, information about reporting bugs, and the
70       latest    version    of    this    page,    can     be     found     at
71       https://www.kernel.org/doc/man-pages/.
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75GNU                               2021-03-22                      GETTTYENT(3)
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