1 files changed, 71 insertions, 0 deletions
diff --git a/library/version.c b/library/version.c
new file mode 100644
index 0000000..eab3404
--- /dev/null
+++ b/library/version.c
@@ -0,0 +1,71 @@
+/*
+ * libproc2 - Library to read proc filesystem
+ *
+ * Copyright © 2002-2023 Craig Small <csmall@dropbear.xyz>
+ * Copyright © 2013-2023 Jim Warner <james.warner@comcast.net>
+ * Copyright © 2011-2012 Sami Kerola <kerolasa@iki.fi>
+ * Copyright © 2002-2003 Albert Cahalan
+ * Copyright © 1996      Charles Blake <cblake@bbn.com>
+ * Copyright © 1995      Martin Schulze <joey@infodrom.north.de>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <errno.h>
+#include <stdio.h>
+#include "misc.h"
+#include "procps-private.h"
+
+#ifdef __CYGWIN__
+#define PROCFS_OSRELEASE "/proc/version"
+#define PROCFS_OSPATTERN "%*s version %u.%u.%u"
+#else
+#define PROCFS_OSRELEASE "/proc/sys/kernel/osrelease"
+#define PROCFS_OSPATTERN "%u.%u.%u"
+#endif
+
+/*
+ * procps_linux_version
+ *
+ * Return the current running Linux version release as shown in
+ * the procps filesystem.
+ *
+ * There are three ways you can get OS release:
+ *  1) /proc/sys/kernel/osrelease - returns correct version of procfs
+ *  2) /proc/version - returns version of kernel e.g. BSD this is wrong
+ *  3) uname and uts.release - same as /proc/version field #3
+ *
+ * Returns: version as an integer
+ * Negative value means an error
+ */
+PROCPS_EXPORT int procps_linux_version(void)
+{
+    FILE *fp;
+    char buf[256];
+    unsigned int x = 0, y = 0, z = 0;
+    int version_string_depth;
+
+    if ((fp = fopen(PROCFS_OSRELEASE, "r")) == NULL)
+	return -errno;
+    if (fgets(buf, 256, fp) == NULL) {
+	fclose(fp);
+	return -EIO;
+    }
+    fclose(fp);
+    version_string_depth = sscanf(buf, PROCFS_OSPATTERN, &x, &y, &z);
+    if ((version_string_depth < 2) ||		 /* Non-standard for all known kernels */
+       ((version_string_depth < 3) && (x < 3))) /* Non-standard for 2.x.x kernels */
+	return -ERANGE;
+    return LINUX_VERSION(x,y,z);
+}