mount.nfs: Replace fork() with daemon() for backgrounding mounts

Neil recommended this change to address a problem with background mount
processes handling signals properly during an init level change.  It is
also useful for preventing background mount processes from reporting
progress on the parent's tty, which is generally just annoying noise.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Neil Brown <neilb@suse.de>

diff --git a/utils/mount/mount.c b/utils/mount/mount.c
index 4b78021a5d1446d01a7ef8aee6c5ce84f8cf825e..251394380e76b49763119e2c307ef43cf1fd8b1c 100644 (file)
--- a/utils/mount/mount.c
+++ b/utils/mount/mount.c
@@ -550,14 +550,19 @@ int main(int argc, char *argv[])
        mnt_err = try_mount(spec, mount_point, flags, fs_type, &extra_opts,
                                mount_opts, fake, nomtab, FOREGROUND);
        if (mnt_err == EX_BG) {
-               printf(_("mount: backgrounding \"%s\"\n"), spec);
+               printf(_("%s: backgrounding \"%s\"\n"),
+                       progname, spec);
                fflush(stdout);
 
                /*
                 * Parent exits immediately with success.
                 */
-               if (fork() > 0)
-                       exit(0);
+               if (daemon(0, 0)) {
+                       nfs_error(_("%s: failed to start "
+                                       "background process: %s\n"),
+                                               progname, strerror(errno));
+                       exit(EX_FAIL);
+               }
 
                mnt_err = try_mount(spec, mount_point, flags, fs_type,
                                        &extra_opts, mount_opts, fake,