projects / thirdparty / man-pages.git / blame
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1 | .\" Hey Emacs! This file is -*- nroff -*- source. |
| 2 | .\" | |
| 3 | .\" Copyright (c) 1993 Michael Haardt | |
| 4 | .\" (michael@moria.de) | |
| 5 | .\" Fri Apr 2 11:32:09 MET DST 1993 | |
| 6 | .\" | |
| 7 | .\" This is free documentation; you can redistribute it and/or | |
| 8 | .\" modify it under the terms of the GNU General Public License as | |
| 9 | .\" published by the Free Software Foundation; either version 2 of | |
| 10 | .\" the License, or (at your option) any later version. | |
| 11 | .\" | |
| 12 | .\" The GNU General Public License's references to "object code" | |
| 13 | .\" and "executables" are to be interpreted as the output of any | |
| 14 | .\" document formatting or typesetting system, including | |
| 15 | .\" intermediate and printed output. | |
| 16 | .\" | |
| 17 | .\" This manual is distributed in the hope that it will be useful, | |
| 18 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 20 | .\" GNU General Public License for more details. | |
| 21 | .\" | |
| 22 | .\" You should have received a copy of the GNU General Public | |
| 23 | .\" License along with this manual; if not, write to the Free | |
| 24 | .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, | |
| 25 | .\" USA. | |
| 26 | .\" | |
| 27 | .\" Modified Sat Jul 24 15:12:05 1993 by Rik Faith <faith@cs.unc.edu> | |
| 28 | .\" Modified Tue Aug 1 16:27 1995 by Jochen Karrer | |
| 29 | .\" <cip307@cip.physik.uni-wuerzburg.de> | |
| 30 | .\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com> | |
| 31 | .\" Modified Mon Feb 15 17:28:41 CET 1999 by Andries E. Brouwer <aeb@cwi.nl> | |
| 32 | .\" Modified, 27 May 2004, Michael Kerrisk <mtk16@ext.canterbury.ac.nz> | |
| 33 | .\" Added notes on capability requirements | |
| 34 | .\" | |
| 35 | .TH IOPERN 2 2004-05-27 "Linux 2.6.6" "Linux Programmer's Manual" | |
| 36 | .SH NAME | |
| 37 | ioperm \- set port input/output permissions | |
| 38 | .SH SYNOPSIS | |
| 39 | .B #include <unistd.h> | |
| 40 | /* for libc5 */ | |
| 41 | .br | |
| 42 | .B #include <sys/io.h> | |
| 43 | /* for glibc */ | |
| 44 | .sp | |
| 45 | .BI "int ioperm(unsigned long " from ", unsigned long " num ", int " turn_on ); | |
| 46 | .SH DESCRIPTION | |
| 47 | \fBIoperm\fP sets the port access permission bits for the process for | |
| 48 | \fInum\fP bytes starting from port address \fBfrom\fP to the value | |
| 49 | \fBturn_on\fP. The use of \fBioperm\fP requires root privileges. | |
| 50 | ||
| 51 | Only the first 0x3ff I/O ports can be specified in this manner. For more | |
| 52 | ports, the | |
| 53 | .B iopl | |
| 54 | function must be used. | |
| 55 | Permissions are not inherited on fork, but on exec they are. This is | |
| 56 | useful for giving port access permissions to non-privileged tasks. | |
| 57 | ||
| 58 | This call is mostly for the i386 architecture. | |
| 59 | On many other architectures it does not exist or will always | |
| 60 | return an error. | |
| 61 | .SH "RETURN VALUE" | |
| 62 | On success, zero is returned. On error, \-1 is returned, and | |
| 63 | .I errno | |
| 64 | is set appropriately. | |
| 65 | .SH ERRORS | |
| 66 | .TP | |
| 67 | .B EINVAL | |
| 68 | Invalid values for | |
| 69 | .I from | |
| 70 | or | |
| 71 | .IR num . | |
| 72 | .TP | |
| 73 | .B EIO | |
| 74 | (on ppc) This call is not supported. | |
| 75 | .TP | |
| 76 | .B EPERM | |
| 77 | The calling process has insufficient privilege to call | |
| 78 | .BR ioperm ; | |
| 79 | the | |
| 80 | .B CAP_SYS_RAWIO | |
| 81 | capability is required. | |
| 82 | .SH "CONFORMING TO" | |
| 83 | \fBioperm\fP is Linux specific and should not be used in programs | |
| 84 | intended to be portable. | |
| 85 | .SH NOTES | |
| 86 | Libc5 treats it as a system call and has a prototype in | |
| 87 | .IR <unistd.h> . | |
| 88 | Glibc1 does not have a prototype. Glibc2 has a prototype both in | |
| 89 | .I <sys/io.h> | |
| 90 | and in | |
| 91 | .IR <sys/perm.h> . | |
| 92 | Avoid the latter, it is available on i386 only. | |
| 93 | .SH "SEE ALSO" | |
| 94 | .BR iopl (2), | |
| 95 | .BR capabilities (7) |