ctermid(3)

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

6       ctermid - get controlling terminal name
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SYNOPSIS

9       #include <stdio.h>
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11       char *ctermid(char *s);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       ctermid():
16           _POSIX_C_SOURCE
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DESCRIPTION

19       ctermid()  returns  a string which is the pathname for the current con‐
20       trolling terminal for this process.  If s is NULL, a static  buffer  is
21       used,  otherwise  s  points to a buffer used to hold the terminal path‐
22       name.  The symbolic constant L_ctermid is the maximum number of charac‐
23       ters in the returned pathname.
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RETURN VALUE

26       The pointer to the pathname.
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ATTRIBUTES

29       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
30       tributes(7).
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32       ┌────────────────────────────────────────────┬───────────────┬─────────┐
33       │Interface                                   │ Attribute     │ Value   │
34       ├────────────────────────────────────────────┼───────────────┼─────────┤
35       │ctermid()                                   │ Thread safety │ MT-Safe │
36       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

39       POSIX.1-2001, POSIX.1-2008, Svr4.
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BUGS

42       The returned pathname may not uniquely identify the controlling  termi‐
43       nal; it may, for example, be /dev/tty.
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45       It is not assured that the program can open the terminal.
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COLOPHON

51       This  page  is  part of release 5.13 of the Linux man-pages project.  A
52       description of the project, information about reporting bugs,  and  the
53       latest     version     of     this    page,    can    be    found    at
54       https://www.kernel.org/doc/man-pages/.
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58GNU                               2021-03-22                        CTERMID(3)