Merge pull request #210 from nowaits/master

add clixon proc get pid api

lib/clixon/clixon_proc.h

@@ -61,6 +61,7 @@ typedef int (proc_cb_t)(clicon_handle h, process_entry_t *pe, proc_operation *op
 int clixon_proc_socket(char **argv, pid_t *pid, int *sock);
 int clixon_proc_socket_close(pid_t pid, int sock);
 int clixon_proc_background(char **argv, const char *netns, pid_t *pid);
+int clixon_process_pid(clicon_handle h, const char *name, pid_t *pid);
 proc_operation clixon_process_op_str2int(char *opstr);
 int clixon_process_argv_get(clicon_handle h, const char *name, char ***argv, int *argc);
 int clixon_process_register(clicon_handle h, const char *name, const char *descr, const char *netns, proc_cb_t *callback, char **argv, int argc);

lib/src/clixon_proc.c

@@ -540,6 +540,39 @@ proc_op_run(pid_t pid0,
     return retval;
 }
 
+int
+clixon_process_pid(clicon_handle h, 
+            const char *name, 
+            pid_t   *pid)
+{
+    int             retval = -1;
+    process_entry_t *pe;
+    int              isrunning; /* Process is actually running */
+
+    if (_proc_entry_list == NULL || !pid)
+    goto done;
+
+    pe = _proc_entry_list;
+    do {
+    if (strcmp(pe->pe_name, name) == 0) {
+        isrunning = 0;
+        if (proc_op_run(pe->pe_pid, &isrunning) < 0)
+            goto done;
+
+        if (!isrunning)
+            goto done;
+
+        *pid = pe->pe_pid;
+        retval = 0;
+        break;
+    }
+    pe = NEXTQ(process_entry_t *, pe);
+    } while (pe != _proc_entry_list);
+
+done:
+    return retval;
+}
+
 /*! Find process entry given name and schedule operation
  *
  * @param[in]  h       clicon handle