ctermid(3) — Linux manual page

ctermid(3)              Library Functions Manual              ctermid(3)

NAME

       ctermid - get controlling terminal name

LIBRARY

       Standard C library (libc, -lc)

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 │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001, 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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Linux man-pages 6.9.1          2024-05-02                     ctermid(3)

Pages that refer to this page: ttyname(3)

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