bionic (3) ctermid.3.gz

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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 path returned 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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