[Xen-devel] [PATCH 1/3] Make xenstored manage its own pidfile

[Anthony Liguori <aliguori@xxxxxxxxxx>]

The following patch makes xenstored manage its own pidfile which makes 
it impossible for it to be started multiple times.
Signed-off-by: Anthony Liguori <aliguori@xxxxxxxxxx

Regards,

Anthony Liguori

diff -r 1d240086de52 tools/xenstore/utils.c
--- a/tools/xenstore/utils.c    Thu Aug  4 15:02:09 2005
+++ b/tools/xenstore/utils.c    Thu Aug  4 10:54:13 2005
@@ -84,6 +84,9 @@
 void daemonize(void)
 {
        pid_t pid;
+       int fd;
+       size_t len;
+       char buf[100];
 
        /* Separate from our parent via fork, so init inherits us. */
        if ((pid = fork()) < 0)
@@ -101,6 +104,18 @@
        chdir("/");
        /* Discard our parent's old-fashioned umask prejudices. */
        umask(0);
+
+       fd = open("/var/run/xenstored.pid", O_RDWR | O_CREAT);
+       if (fd == -1) {
+               exit(1);
+       }
+
+       if (lockf(fd, F_TLOCK, 0) == -1) {
+               exit(1);
+       }
+
+       len = sprintf(buf, "%d\n", getpid());
+       write(fd, buf, len);
 }
 
 

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