a63ec765cb
If you write to 59 Temple Place you're unlikely to get a response. Let's realign the address with a more up-to-date one from [1]. [1] https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt This is purely a cosmetic change, doesn't affect the meaning of the license. Done to make rpmlint happy. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
57 lines
2.2 KiB
Text
57 lines
2.2 KiB
Text
.\" Copyright (c) 2014 Jeff Epler
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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.\" USA.
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.TH funct "3rtapi" "2014-06-28" "LinuxCNC Documentation" "RTAPI"
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.SH NAME
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rtapi_io.h \- RTAPI wrappers for linux kernel functionality
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.SH SYNTAX
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.HP
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#include <rtapi_io.h>
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.HP
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unsigned char rtapi_inb(unsigned short int port);
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.HP
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unsigned short rtapi_inw(unsigned short int port);
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.HP
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unsigned int rtapi_inl(unsigned short int port);
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.HP
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unsigned void rtapi_inb(unsigned char value, unsigned short int port);
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.HP
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unsigned void rtapi_inw(unsigned short value, unsigned short int port);
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.HP
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unsigned void rtapi_inl(unsigned int value, unsigned short int port);
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.SH DESCRIPTION
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In kernel space, each rtapi_xxx or RTAPI_XXX identifier is mapped to the
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underlying kernel functionality, if available.
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In userspace, or in kernels where the underlying functionality is not provided
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by a kernel, generally another implementation--possibly with reduced
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functionality--is provided. (For example, the userspace implementation for
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rtapi_device_register always succeeds)
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.SH REALTIME CONSIDERATIONS
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Call from init/cleanup code and from realtime tasks. These functions will
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cause illegal instruction exceptions in userspace components, as well as in
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uspace rtapi_app when it is not setuid root.
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.SH RETURN VALUE
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As in Linux.
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.SH SEE ALSO
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