Don't assume that mdmon is in the current directory.

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index 0c1dfeebfa94ca96b56ee3a1e2fb6d5226fd38af..fe46f3b02d9c20a58079e0f70f8b48d41308d1e5 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1074,6 +1074,64 @@ int signal_mdmon(int devnum)
        return 0;
 }
 
+int start_mdmon(int devnum)
+{
+       int i;
+       int len;
+       char pathbuf[1024];
+       char *paths[4] = {
+               pathbuf,
+               "/sbin/mdmon",
+               "mdmon",
+               NULL
+       };
+
+       if (env_no_mdmon())
+               return 0;
+
+       len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf));
+       if (len > 0) {
+               char *sl;
+               pathbuf[len] = 0;
+               sl = strrchr(pathbuf, '/');
+               if (sl)
+                       sl++;
+               else
+                       sl = pathbuf;
+               strcpy(sl, "mdmon");
+       } else
+               pathbuf[0] = '\0';
+
+       switch(fork()) {
+       case 0:
+               /* FIXME yuk. CLOSE_EXEC?? */
+               for (i=3; i < 100; i++)
+                       close(i);
+               for (i=0; paths[i]; i++)
+                       if (paths[i][0])
+                               execl(paths[i], "mdmon",
+                                     map_dev(dev2major(devnum),
+                                             dev2minor(devnum),
+                                             1), NULL);
+               exit(1);
+       case -1: fprintf(stderr, Name ": cannot run mdmon. "
+                        "Array remains readonly\n");
+               return -1;
+       default: ; /* parent - good */
+       }
+       return 0;
+}
+
+int env_no_mdmon(void)
+{
+       char *val = getenv("MDADM_NO_MDMON");
+
+       if (val && atoi(val) == 1)
+               return 1;
+
+       return 0;
+}
+
 
 int flush_metadata_updates(struct supertype *st)
 {