[PATCH] nfs-utils - 2 of 6 - statd - creates a pid file

[Steve Dickson <SteveD@redhat.com>]

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This patch added code that will make
statd create a pid file (rpc.statd) in
/var/run. This was need to help our rc
script detect the status of stated.


SteveD.

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--- ./utils/statd/statd.c.org	2003-06-02 15:17:17.000000000 -0400
+++ ./utils/statd/statd.c	2003-06-02 15:18:36.000000000 -0400
@@ -21,6 +21,9 @@
 #include <grp.h>
 #include <sys/types.h>
 #include <fcntl.h>
+#include <errno.h>
+#include <netdb.h>
+#include <sys/wait.h>
 #include "statd.h"
 #include "version.h"
 
@@ -72,6 +75,51 @@ extern void simulator (int, char **);
 #endif
 
 /*
+ * Create a pid file 
+ */
+static const char *piddir="/var/run/rpc.statd";
+static const char *pidfile="/var/run/rpc.statd/rpc.statd.pid";
+static void
+delete_pidfile(void)
+{
+	if (unlink(pidfile) < 0) {
+		log(L_WARNING,"Unlinking %s failed: errno %d (%s)\n", pidfile,
+			errno, strerror(errno));
+	}
+
+	return;
+}
+static void
+create_pidfile(void)
+{
+	FILE *fp;
+
+	if (access(pidfile, F_OK) == 0) {
+		die("rpc.statd is already running (check PID in %s)\n", pidfile);
+	}
+
+	/*
+	 * A directory is need so the pid file can be remove
+	 * once the privs have been dropped.
+	 */
+	if (mkdir(piddir, 0755) < 0 && errno != EEXIST) {
+		die("Creating %s directory failed: errno %d (%s)\n", pidfile,
+			errno, strerror(errno));
+	}
+	if ((fp = fopen(pidfile, "w")) == NULL) {
+			die("Opening %s failed: errno %d (%s)\n", pidfile,
+				errno, strerror(errno));
+	}
+	fprintf(fp, "%d", getpid());
+	if (fclose(fp) < 0) {
+		log(L_WARNING,"Closing %s failed: errno %d (%s)\n", pidfile,
+			errno, strerror(errno));
+	}
+
+	return;
+}
+
+/*
  * Privilege dropper
  */
 static void
@@ -94,6 +142,10 @@ drop_privs(void)
     die("Cannot start - cannot drop privs: getpwnam()\n");
   }
 
+  if (chown(piddir, pw->pw_uid, pw->pw_gid) < 0) {
+	log(L_WARNING,"Owner change of '%s' to user '%s' failed: errno %d (%s)\n", 
+		pidfile, pw->pw_name, errno, strerror(errno));
+  }
   initgroups(pw->pw_name, pw->pw_gid);
 
   setgid(pw->pw_gid);
@@ -343,6 +395,8 @@ int main (int argc, char **argv)
 	}
 
 	log_init (name_p, version_p);
+	create_pidfile();
+	atexit(delete_pidfile);
 
 	/* Child. */
 	signal (SIGHUP, killer);
@@ -364,7 +418,7 @@ int main (int argc, char **argv)
 		die("Startup failed: Please start rpc.statd as root\n");
  
 	/* Arm the ****** resolver before chroot() so it doesn't fail
-	 * trying to open /etc/ for the dozenth time
+	 * trying to open /etc/host for the dozenth time
 	 */
 	sethostent(1);