lsns: add more print-debug code

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
index 0c66d648af5b7d87d6815a9376e1c5c607d4ff24..2c4ec9da0ea81ed19b3b779d6b1deeaa56a3764e 100644 (file)
--- a/sys-utils/lsns.c
+++ b/sys-utils/lsns.c
@@ -543,10 +543,14 @@ static int read_process(struct lsns *ls, struct path_cxt *pc)
        if (procfs_process_get_uid(pc, &p->uid) == 0)
                add_uid(uid_cache, p->uid);
 
-       if ((rc = procfs_process_get_stat(pc, buf, sizeof(buf))) < 0)
+       if ((rc = procfs_process_get_stat(pc, buf, sizeof(buf))) < 0) {
+               DBG(PROC, ul_debug("failed in procfs_process_get_stat() (rc: %d)", rc));
                goto done;
-       if ((rc = parse_proc_stat(buf, &p->pid, &p->state, &p->ppid)) < 0)
+       }
+       if ((rc = parse_proc_stat(buf, &p->pid, &p->state, &p->ppid)) < 0) {
+               DBG(PROC, ul_debug("failed in parse_proc_stat() (rc: %d)", rc));
                goto done;
+       }
        rc = 0;
 
        for (i = 0; i < ARRAY_SIZE(p->ns_ids); i++) {
@@ -557,8 +561,10 @@ static int read_process(struct lsns *ls, struct path_cxt *pc)
 
                rc = get_ns_ino(pc, ns_names[i], &p->ns_ids[i],
                                &p->ns_pids[i], &p->ns_oids[i]);
-               if (rc && rc != -EACCES && rc != -ENOENT)
+               if (rc && rc != -EACCES && rc != -ENOENT) {
+                       DBG(PROC, ul_debug("failed in get_ns_ino (rc: %d)", rc));
                        goto done;
+               }
                if (i == LSNS_ID_NET)
                        p->netnsid = get_netnsid(pc, p->ns_ids[i]);
                rc = 0;
@@ -602,7 +608,7 @@ static int read_processes(struct lsns *ls)
                DBG(PROC, ul_debug("reading %d", (int) pid));
                rc = procfs_process_init_path(pc, pid);
                if (rc < 0) {
-                       DBG(PROC, ul_debug("failed in reading /proc/%d (rc: %d)", (int) pid, rc));
+                       DBG(PROC, ul_debug("failed in initializing path_cxt for /proc/%d (rc: %d)", (int) pid, rc));
                        /* This failure is acceptable. If a process ($pid) owning
                         * a namespace is gone while running this lsns process,
                         * procfs_process_init_path(pc, $pid) may fail.
@@ -617,8 +623,10 @@ static int read_processes(struct lsns *ls)
                }
 
                rc = read_process(ls, pc);
-               if (rc && rc != -EACCES && rc != -ENOENT)
+               if (rc && rc != -EACCES && rc != -ENOENT) {
+                       DBG(PROC, ul_debug("failed in read_process() (pid: %d, rc: %d)", (int) pid, rc));
                        break;
+               }
                rc = 0;
        }