Add cgroup_get_procname_from_procfs() for getting a process name.

Hi,

Changelog of v6:
================
 * Change the returning values of *_get_procname_from_proc*() to integer
   from charactor pointer.
 * Clarify the number meaning of string length in cg_get_procname_from_
   ~proc_status()

Changelog of v5:
================
 * Rebase the patch to the latest code.

Changelog of v4:
================
 * Add the error handling for strdup()'s error.
 * Reduce strlen() calls.
 * Make the check code of a process name simple.

Changelog of v3:
================
 * Move cgroup_get_procname_from_procfs() to libcgroup-internal.h.
 * Fix unclear buffer of buf_cwd by memset().
 * Get a real path of script file by realpath().

Changelog of v2:
================
 * It is possible to handle a process, which name length is over than
   16 characters, also.

Description:
============
This patch adds a new function cgroup_get_procname_from_procfs()
for getting a process name.

This function allocates the memory for a process name, and writes
the name to the memory, and returns the pointer of the memory.
So a caller should free the memory if unusing it.

The process name, which is wrotten by this function, depends on
the specified process:

 If a command process)      the full path of command.
 If a shell script process) the full path of shell script.
 If a kernel thread)        the process name of kernel thread.

Thanks
Ken'ichi Ohmichi

Signed-off-by: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/libcgroup-internal.h b/src/libcgroup-internal.h
index 95ff76c..fac82a1 100644
--- a/src/libcgroup-internal.h
+++ b/src/libcgroup-internal.h
@@ -100,6 +100,7 @@ struct cgroup_tree_handle {
 /* Internal API */
 char *cg_build_path(char *name, char *path, char *type);
 int cgroup_get_uid_gid_from_procfs(pid_t pid, uid_t *euid, gid_t *egid);
+int cgroup_get_procname_from_procfs(pid_t pid, char **procname);
 int cg_mkdir_p(const char *path);