From: Ilya Dryomov <ilya.dryomov@inktank.com>
Date: Mon, 16 Dec 2013 16:57:21 +0000 (+0200)
Subject: common: introduce get_linux_version()
X-Git-Tag: v0.75~96^2~2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=fcf6e9878bed5ddc1e642844923b3ac7312dcd1e;p=ceph.git

common: introduce get_linux_version()

get_linux_version() returns a version of the currently running kernel,
encoded as in int, and is contained in common/linux_version.[ch].

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
---

diff --git a/configure.ac b/configure.ac
index 4c3afa367203..aa053b10d38e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -584,6 +584,7 @@ AC_CHECK_MEMBER([struct fiemap_extent.fe_logical],
 
 AC_CHECK_HEADERS([ \
 	arpa/inet.h \
+	linux/version.h \
 	netdb.h \
 	netinet/in.h \
 	sys/file.h \
diff --git a/src/common/Makefile.am b/src/common/Makefile.am
index 080e276d39af..ecc40d246c6a 100644
--- a/src/common/Makefile.am
+++ b/src/common/Makefile.am
@@ -69,7 +69,9 @@ libcommon_la_SOURCES = \
 	common/bloom_filter.cc
 
 if LINUX
-libcommon_la_SOURCES += common/secret.c
+libcommon_la_SOURCES += \
+	common/secret.c \
+	common/linux_version.c
 endif
 
 # these should go out of libcommon
@@ -195,7 +197,8 @@ noinst_HEADERS += \
 	common/AsyncReserver.h \
 	common/sync_filesystem.h \
 	common/cmdparse.h \
-	common/hobject.h
+	common/hobject.h \
+	common/linux_version.h
 
 noinst_LTLIBRARIES += libcommon.la
 
diff --git a/src/common/linux_version.c b/src/common/linux_version.c
new file mode 100644
index 000000000000..b83dc71e4ed4
--- /dev/null
+++ b/src/common/linux_version.c
@@ -0,0 +1,25 @@
+#include "common/linux_version.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/utsname.h>
+
+int get_linux_version(void)
+{
+	struct utsname ubuf;
+	int a, b, c;
+	int n;
+
+	if (uname(&ubuf) || strcmp(ubuf.sysname, "Linux"))
+		return 0;
+
+	n = sscanf(ubuf.release, "%d.%d.%d", &a, &b, &c);
+	switch (n) {
+	case 3:
+		return KERNEL_VERSION(a, b, c);
+	case 2:
+		return KERNEL_VERSION(a, b, 0);
+	default:
+		return 0;
+	}
+}
diff --git a/src/common/linux_version.h b/src/common/linux_version.h
new file mode 100644
index 000000000000..5588c55ba220
--- /dev/null
+++ b/src/common/linux_version.h
@@ -0,0 +1,22 @@
+#ifndef CEPH_LINUX_VERSION_H
+#define CEPH_LINUX_VERSION_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef HAVE_LINUX_VERSION_H
+# include <linux/version.h>
+#endif
+
+#ifndef KERNEL_VERSION
+# define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#endif
+
+int get_linux_version(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CEPH_LINUX_VERSION_H */