processes plugin: Read number of threads from /proc/$pid/stat as a fallback.

Should reading the number of threads from /prod/$pid/status fail, use the
number provided by /prod/$pid/stat as a fallback. If that fails, too, use 1.

As discussed with @manuelluis in #1033.

diff --git a/src/processes.c b/src/processes.c
index 8b7d759..176cdf9 100644 (file)
--- a/src/processes.c
+++ b/src/processes.c
@@ -843,7 +843,8 @@ static procstat_t *ps_read_status (int pid, procstat_t *ps)
 
        ps->vmem_data = data * 1024;
        ps->vmem_code = (exe + lib) * 1024;
-       ps->num_lwp = threads;
+       if (threads != 0)
+               ps->num_lwp = threads;
 
        return (ps);
 } /* procstat_t *ps_read_vmem */
@@ -986,18 +987,16 @@ int ps_read_process (int pid, procstat_t *ps, char *state)
        }
        else
        {
-               if ( (ps_read_status(pid, ps)) == NULL)
+               ps->num_lwp = strtoul (fields[17], /* endptr = */ NULL, /* base = */ 10);
+               if ((ps_read_status(pid, ps)) == NULL)
                {
                        /* No VMem data */
                        ps->vmem_data = -1;
                        ps->vmem_code = -1;
-                       ps->num_lwp  = 0;
                        DEBUG("ps_read_process: did not get vmem data for pid %i",pid);
                }
-               if ( ps->num_lwp <= 0)
-               {
+               if (ps->num_lwp <= 0)
                        ps->num_lwp = 1;
-               }
                ps->num_proc = 1;
        }