projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright (c) 1993 Michael Haardt (michael@moria.de), Fri Apr 2 11:32:09 MET DST 1993 |
| 2 | .\" | |
| 3 | .\" This is free documentation; you can redistribute it and/or | |
| 4 | .\" modify it under the terms of the GNU General Public License as | |
| 5 | .\" published by the Free Software Foundation; either version 2 of | |
| 6 | .\" the License, or (at your option) any later version. | |
| 7 | .\" | |
| 8 | .\" The GNU General Public License's references to "object code" | |
| 9 | .\" and "executables" are to be interpreted as the output of any | |
| 10 | .\" document formatting or typesetting system, including | |
| 11 | .\" intermediate and printed output. | |
| 12 | .\" | |
| 13 | .\" This manual is distributed in the hope that it will be useful, | |
| 14 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | .\" GNU General Public License for more details. | |
| 17 | .\" | |
| 18 | .\" You should have received a copy of the GNU General Public | |
| 19 | .\" License along with this manual; if not, write to the Free | |
| 20 | .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, | |
| 21 | .\" USA. | |
| c13182ef | 22 | .\" |
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23 | .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) |
| 24 | .\" Modified 2003-04-07 by Michael Kerrisk | |
| 25 | .\" | |
| 26 | .TH TTY 4 2003-04-07 "Linux" "Linux Programmer's Manual" | |
| 27 | .SH NAME | |
| 28 | tty \- controlling terminal | |
| 29 | .SH DESCRIPTION | |
| 8478ee02 | 30 | The file \fI/dev/tty\fP is a character file with major number 5 and |
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31 | minor number 0, usually of mode 0666 and owner.group root.tty. |
| 32 | It is a synonym for the controlling terminal of a process, if any. | |
| fea681da | 33 | .LP |
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34 | In addition to the |
| 35 | .BR ioctl (2) | |
| 36 | requests supported by the device that | |
| 37 | \fBtty\fP refers to, the | |
| 38 | .BR ioctl (2) | |
| 39 | request \fBTIOCNOTTY\fP is supported. | |
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40 | .SS TIOCNOTTY |
| 41 | Detach the current process from its controlling terminal. | |
| 42 | .sp | |
| 43 | If the process is the session leader, | |
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44 | then |
| 45 | .B SIGHUP | |
| 46 | and | |
| 47 | .B SIGCONT | |
| 48 | signals are sent to the foreground process group | |
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49 | and all processes in the current session lose their controlling tty. |
| 50 | .sp | |
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51 | This |
| 52 | .BR ioctl (2) | |
| 53 | call only works on file descriptors connected | |
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54 | to \fI/dev/tty\fP. |
| 55 | It is used by daemon processes when they are invoked | |
| fea681da | 56 | by a user at a terminal. |
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57 | The process attempts to open \fI/dev/tty\fP. |
| 58 | If the open succeeds, it | |
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59 | detaches itself from the terminal by using \fBTIOCNOTTY\fP, while if the |
| 60 | open fails, it is obviously not attached to a terminal and does not need | |
| 61 | to detach itself. | |
| 62 | .SH FILES | |
| 63 | /dev/tty | |
| 64 | .SH "SEE ALSO" | |
| 65 | .BR chown (1), | |
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66 | .BR mknod (1), |
| 67 | .BR ioctl (2), | |
| 68 | .BR termios (3), | |
| 69 | .BR console (4), | |
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70 | .BR ttyS (4), |
| 71 | .BR mingetty (8) |