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.\" (C) Copyright 2016 Craig Small <csmall@enc.com.au>
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.\"
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2016-04-16 04:04:08 +05:30
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.\" %%%LICENSE_START(LGPL_2.1+)
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.\" This manual is free software; you can redistribute it and/or
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.\" modify it under the terms of the GNU Lesser General Public
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.\" License as published by the Free Software Foundation; either
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.\" version 2.1 of the License, or (at your option) any later version.
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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 GNU
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.\" Lesser General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU Lesser General Public
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.\" License along with this library; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\" %%%LICENSE_END
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.\"
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.TH PROCPS_LINUX_VERSION 3 2016-04-14 "libproc-2"
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.\" Please adjust this date whenever revising the manpage.
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.\"
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.SH NAME
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procps_linux_version \-
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provide current version of Linux as an integer
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.SH SYNOPSIS
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.B #include <proc/procps.h>
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.sp
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.B int procps_linux_version(void);
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.sp
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Link with \fI\-lprocps\fP.
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.SH DESCRIPTION
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The function
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.BR procps_linux_version ()
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returns the current Linux version as an integer. On non-Linux systems that
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have an emulated proc filesystem this function returns the version of the
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Linux emulation instead.
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The Linux version consists of a triple of positive integers representing
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the major, minor and patch versions of the kernel.
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.PP
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The library provides 3 macros for separating out the components.
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.RS 4
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.TP 1.2i
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.BR LINUX_VERSION_MAJOR (ver)
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Extract the major component from the given version integer.
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.TP
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.BR LINUX_VERSION_MINOR (ver)
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Extract the minor component from the given version integer.
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.TP
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.BR LINUX_VERSION_PATCH (ver)
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Extract the patch component from the given version integer.
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.RE
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.PP
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To encode a given Linux version, such as using it to compare against the current
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version, use the following macro:
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.TP
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.BI LINUX_VERSION( major , minor , patch )
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.SH RETURN VALUE
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The
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.BR procps_linux_version ()
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returns a positive integer encoding the Linux version if successful. Otherwise
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returns a negative integer to one of the values defined below.
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.TP
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.B -EIO
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The procps library was unable to read the osrelease file.
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.TP
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.B -ERANGE
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Unable to parse the osrelease file.
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.PP
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.BR procps_linux_version ()
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may also return any (negated) value that \fBfopen\fR() may set errno to.
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.SH FILES
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.TP
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.I /proc/sys/kernel/osrelease
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Contains the release version of the Linux kernel or proc filesystem.
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.SH VERSIONS
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.B procps_linux_version()
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first appeared in libproc-2 version 0.0.
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.SH SEE ALSO
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.BR fopen (3),
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.BR proc (5).
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