Split header file III

Changelog:
 - since there are no global macros, base.h is gone
 - since there is no base.h, all headers need to include <features.h> to get
   __BEGIN_DECLS
 - new init.h with cgroup_init() and cgroup_get_subsys_mount_point()
 - new error.h with error handling enum and related stuff
 - use #ifndef _LIBCGROUP_*_H instead _LIBCG_*_H in header guards
 - fix few checkpatch complaints (long lines, whitespaces, ...)

The patch includes Makefile and .spec changes. I tested it compiles,
make dist produces tarball with all headers, so does also the rpm.
'make' should automatically catch all changes in new headers and
recompile dependent (=all) sources when any header changes.

libcgroup.h
  - does not declare anything, it just includes all the other files. In
    future, it might contain base of doxygen documentation (some
    introduction etc.)

libcgroup/error.h
  - the big enum with errors + error related functions

libcgroup/init.h
  - libcgroup_init() and cgroup_get_subsys_mount_point()

libcgroup/config.h
  - configuration reading/unloading

libcgroup/groups.h
  - group manipulation stuff (create/modify/delete/free, incl. controllers and
    get/set values) + definition of struct cgroup (=must be included by
    libcgroup/tasks.h, which needs it)

libcgroup/iterators.h
  - various walks, *_begin/next/end

libcgroup/tasks.h
  - task classification, incl. rules cache manipulation

In addition, I probably removed some #includes, which are not needed now when
looking for the minimal #include set to build the project. I also hope I did not
miss any function declaration or macro...

Signed-off-by: Jan Safranek <jsafrane@redhat.com>
Signed-off-by: Dhaval Giani <dhaval.giani@gmail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/libcgroup/error.h b/include/libcgroup/error.h
new file mode 100644
index 0000000..4d756ff
--- /dev/null
+++ b/include/libcgroup/error.h
@@ -0,0 +1,58 @@
+#ifndef _LIBCGROUP_ERROR_H
+#define _LIBCGROUP_ERROR_H
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+enum {
+	ECGROUPNOTCOMPILED = 50000,
+	ECGROUPNOTMOUNTED,
+	ECGROUPNOTEXIST,
+	ECGROUPNOTCREATED,
+	ECGROUPSUBSYSNOTMOUNTED,
+	ECGROUPNOTOWNER,
+	ECGROUPMULTIMOUNTED,/* Controllers bound to different mount points */
+	ECGROUPNOTALLOWED,  /* This is the stock error. Default error. */
+	ECGMAXVALUESEXCEEDED,
+	ECGCONTROLLEREXISTS,
+	ECGVALUEEXISTS,
+	ECGINVAL,
+	ECGCONTROLLERCREATEFAILED,
+	ECGFAIL,
+	ECGROUPNOTINITIALIZED,
+	ECGROUPVALUENOTEXIST,
+	/* Represents error coming from other libraries like glibc. libcgroup
+	 * users need to check errno upon encoutering ECGOTHER.
+	 */
+	ECGOTHER,	/* OS error, see errno */
+	ECGROUPNOTEQUAL,
+	ECGCONTROLLERNOTEQUAL,
+	ECGROUPPARSEFAIL, /* Failed to parse rules configuration file. */
+	ECGROUPNORULES, /* Rules list does not exist. */
+	ECGMOUNTFAIL,
+	ECGSENTINEL,	/* Please insert further error codes above this */
+	ECGEOF,		/* End of file, iterator */
+	ECGCONFIGPARSEFAIL,/* Failed to parse config file (cgconfig.conf). */
+	ECGNAMESPACEPATHS,
+	ECGNAMESPACECONTROLLER,
+	ECGMOUNTNAMESPACE,
+};
+
+#define ECGRULESPARSEFAIL	ECGROUPPARSEFAIL
+
+/**
+ * Return error corresponding to @code in human readable format.
+ * @code: error code for which the corresponding error string is to be
+ * returned
+ */
+const char *cgroup_strerror(int code);
+
+/**
+ * Return last errno, which caused ECGOTHER error.
+ */
+int cgroup_get_last_errno();
+
+__END_DECLS
+
+#endif /* _LIBCGROUP_INIT_H */