Infra to indentify process

Problem: currently we can't identify which process is running and
how many instances of it are available.

Fix: name the process when its spawned and send it to the server
and save it in the client_t

The processes that abide by this change from this patch are:
1) fuse mount,
2) rebalance,
3) selfheal,
4) tier,
5) quota,
6) snapshot,
7) brick.
8) gfapi (by default. gfapi.<processname> if processname is found)

Note: fuse gets a process name as native-fuse-client by default.
If the user gives a name for the fuse and spawns it, it will be of
this type --process-name native-fuse-client.<name_specified>.
This can be made use by the process like aux mount done by quota,
geo-rep, etc by adding another option in the aux mount " -o
process-name=gsync_mount"

Updates: #178
Signed-off-by: hari gowtham <hgowtham@redhat.com>
Change-Id: Ie4d02257216839338043737691753bab9a974d5e
Reviewed-on: https://review.gluster.org/17957
Smoke: Gluster Build System <jenkins@build.gluster.org>
Tested-by: hari gowtham <hari.gowtham005@gmail.com>
Reviewed-by: Amar Tumballi <amarts@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Aravinda VK <avishwan@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/api/src/glfs.c b/api/src/glfs.c
index 8369546667b..3313fab0372 100644
--- a/api/src/glfs.c
+++ b/api/src/glfs.c
@@ -31,6 +31,9 @@
 #include <sys/types.h>
 #include <unistd.h>
 #include <limits.h>
+#ifdef GF_LINUX_HOST_OS
+#include <sys/prctl.h>
+#endif
 
 #include "glusterfs.h"
 #include "logging.h"
@@ -739,6 +742,8 @@ pub_glfs_new (const char *volname)
 	int              ret            = -1;
 	glusterfs_ctx_t *ctx            = NULL;
         xlator_t        *old_THIS       = NULL;
+        char            pname[16]       = "";
+        char            msg[32]         = "";
 
         if (!volname) {
                 errno = EINVAL;
@@ -789,6 +794,16 @@ pub_glfs_new (const char *volname)
                 goto out;
         }
 
+        ret = -1;
+#ifdef GF_LINUX_HOST_OS
+        ret = prctl (PR_GET_NAME, (unsigned long) pname, 0, 0, 0);
+#endif
+        if (ret)
+                fs->ctx->cmd_args.process_name = gf_strdup ("gfapi");
+        else {
+                snprintf (msg, sizeof(msg), "gfapi.%s", pname);
+                fs->ctx->cmd_args.process_name = gf_strdup (msg);
+        }
         ret = 0;
 
 out:
@@ -1115,6 +1130,7 @@ glusterfs_ctx_destroy (glusterfs_ctx_t *ctx)
 
         GF_FREE (ctx->process_uuid);
         GF_FREE (ctx->cmd_args.volfile_id);
+        GF_FREE (ctx->cmd_args.process_name);
 
         LOCK_DESTROY (&ctx->lock);
         pthread_mutex_destroy (&ctx->notify_lock);