projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| bb40e6aa KB |
1 | .\" Copyright (c) 1990 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| 4 | .\" %sccs.include.redist.man% | |
| 5 | .\" | |
| 6 | .\" @(#)ctermid.3 5.1 (Berkeley) %G% | |
| 7 | .\" | |
| 8 | .TH CTERMID 3 "" | |
| 9 | .UC 7 | |
| 10 | .SH NAME | |
| 11 | ctermid \- generate terminal pathname | |
| 12 | .SH SYNOPSIS | |
| 13 | .nf | |
| 14 | .ft B | |
| 15 | #include <stdio.h> | |
| 16 | .sp | |
| 17 | char *ctermid(char *buf); | |
| 18 | .ft R | |
| 19 | .fi | |
| 20 | .SH DESCRIPTION | |
| 21 | The | |
| 22 | .I ctermid | |
| 23 | function generates a string, that, when used as a pathname, refers to | |
| 24 | the current controlling terminal for the current process. | |
| 25 | .PP | |
| 26 | If | |
| 27 | .I buf | |
| 28 | is a NULL pointer, a pointer to a static area is returned. | |
| 29 | Otherwise, the pathname is copied into the memory referenced by | |
| 30 | .IR buf . | |
| 31 | .I Buf | |
| 32 | is assumed to be at least L_ctermid (as defined in the include | |
| 33 | file <stdio.h>) bytes long. | |
| 34 | .PP | |
| 35 | The current implementation simply returns ``/dev/tty''. | |
| 36 | .SH RETURN | |
| 37 | Upon successful completion, a non-NULL pointer is returned. | |
| 38 | Otherwise, a NULL pointer is returned and | |
| 39 | .I errno | |
| 40 | is set to indicate the error. | |
| 41 | .SH ERRORS | |
| 42 | The current implementation detects no error conditions. | |
| 43 | .SH "SEE ALSO" | |
| 44 | ttyname(3) | |
| 45 | .SH STANDARDS | |
| 46 | .I Ctermid | |
| 47 | conforms to IEEE Std 1003.1-1988 (``POSIX''). | |
| 48 | .SH BUGS | |
| 49 | By default, all information is contained in a static buffer which is | |
| 50 | overwritten by each new call. | |
| 51 | It must be copied elsewhere to be retained. |