NAME

       ctermid - get controlling terminal name

SYNOPSIS

       #include <stdio.h>

       char *ctermid(char *s);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       ctermid(): _POSIX_C_SOURCE

DESCRIPTION

       ctermid()  returns  a string which is the pathname for the current controlling terminal for this process.
       If s is NULL, a static buffer is used, otherwise s points to a buffer used to hold the terminal pathname.
       The symbolic constant L_ctermid is the maximum number of characters in the returned pathname.

RETURN VALUE

       The pointer to the pathname.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).
       ┌───────────┬───────────────┬─────────┐
       │ Interface │ Attribute     │ Value   │
       ├───────────┼───────────────┼─────────┤
       │ ctermid() │ Thread safety │ MT-Safe │
       └───────────┴───────────────┴─────────┘

CONFORMING TO

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

BUGS

       The returned pathname may not uniquely identify  the  controlling  terminal;  it  may,  for  example,  be
       /dev/tty.

       It is not assured that the program can open the terminal.

SEE ALSO

       ttyname(3)

COLOPHON

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GNU                                                2019-03-06                                         CTERMID(3)