1ctermid(3C)              Standard C Library Functions              ctermid(3C)
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NAME

6       ctermid, ctermid_r - generate path name for controlling terminal
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SYNOPSIS

9       #include <stdio.h>
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11       char *ctermid(char *s);
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14       char *ctermid_r(char *s);
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DESCRIPTION

18   ctermid()
19       The  ctermid() function generates the path name of the controlling ter‐
20       minal for the current process and stores it in a string.
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23       If s is a null pointer, the string is stored in an internal static area
24       whose  address  is  returned  and whose contents are overwritten at the
25       next call to ctermid(). Otherwise, s is assumed to point to a character
26       array  of  at least L_ctermid elements. The path name is placed in this
27       array and the value of s is returned. The constant L_ctermid is defined
28       in the header <stdio.h>.
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30   ctermid_r()
31       The  ctermid_r()  function  behaves  as ctermid() except that if s is a
32       null pointer, the function returns NULL.
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USAGE

35       The difference between ctermid() and ttyname(3C) is that ttyname() must
36       be passed a file descriptor and returns the actual name of the terminal
37       associated with that file descriptor, while ctermid() returns a  string
38       (/dev/tty)  that will refer to the terminal if used as a file name. The
39       ttyname() function is useful only if the process already has  at  least
40       one file open to a terminal.
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43       The  ctermid()  function  is unsafe in multithreaded applications.  The
44       ctermid_r() function is MT-Safe and should be used instead.
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47       When compiling multithreaded applications, the  _REENTRANT flag must be
48       defined on the compile line.  This flag should be used only with multi‐
49       threaded applications.
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ATTRIBUTES

52       See attributes(5) for descriptions of the following attributes:
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57       ┌─────────────────────────────┬─────────────────────────────┐
58       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
59       ├─────────────────────────────┼─────────────────────────────┤
60       │Interface Stability          │ctermid() is Standard        │
61       ├─────────────────────────────┼─────────────────────────────┤
62       │MT-Level                     │ctermid() is Unsafe;  cter‐  │
63       │                             │mid_r() is MT-Safe           │
64       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

67       ttyname(3C), attributes(5)
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71SunOS 5.11                        25 Jul 2000                      ctermid(3C)
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