Add a ``-P pidfile'' option

svn path=/head/; revision=53609

libexec/pppoed/pppoed.8

@@ -34,6 +34,7 @@
 .Sh SYNOPSIS
 .Nm pppoed
 .Op Fl Fd
+.Op Fl P Ar pidfile
 .Op Fl a Ar name
 .Op Fl e Ar exec
 .Op Fl p Ar provider
@@ -120,6 +121,12 @@ If the
 flag is given, additional diagnostics are provided (see the
 .Sx DIAGNOSTICS
 section below).
+.Pp
+If
+.Ar pidfile
+is given,
+.Nm
+will write its process ID to this file on startup.
 .Sh DIAGNOSTICS
 After creating the necessary
 .Xr netgraph 4

libexec/pppoed/pppoed.c

@@ -65,11 +65,13 @@
 static int
 usage(const char *prog)
 {
-  fprintf(stderr, "Usage: %s [-Fd] [-a name] [-e exec] [-p provider]"
-          " interface\n", prog);
+  fprintf(stderr, "Usage: %s [-Fd] [-P pidfile] [-a name] [-e exec]"
+          " [-p provider] interface\n", prog);
   return EX_USAGE;
 }
 
+const char *pidfile;
+
 static void
 Fairwell(int sig)
 {
@@ -81,6 +83,9 @@ Fairwell(int sig)
 
   syslog(LOG_INFO, buf);
 
+  if (pidfile)
+    remove(pidfile);
+
   signal(sig, SIG_DFL);
   raise(sig);
 }
@@ -422,17 +427,22 @@ main(int argc, char **argv)
 
   prog = strrchr(argv[0], '/');
   prog = prog ? prog + 1 : argv[0];
+  pidfile = NULL;
   exec = NULL;
   acname = NULL;
   provider = "";
   optF = optd = 0;
 
-  while ((ch = getopt(argc, argv, "a:Fde:p:")) != -1) {
+  while ((ch = getopt(argc, argv, "FP:a:de:p:")) != -1) {
     switch (ch) {
       case 'F':
         optF = 1;
         break;
 
+      case 'P':
+        pidfile = optarg;
+        break;
+
       case 'a':
         acname = optarg;
         break;
@@ -512,9 +522,26 @@ main(int argc, char **argv)
 
   if (!optF && daemon(1, 0) == -1) {
     perror("daemon()");
+    close(cs);
+    close(ds);
     return EX_OSERR;
   }
 
+
+  if (pidfile != NULL) {
+    FILE *fp;
+
+    if ((fp = fopen(pidfile, "w")) == NULL) {
+      perror(pidfile);
+      close(cs);
+      close(ds);
+      return EX_CANTCREAT;
+    } else {
+      fprintf(fp, "%d\n", (int)getpid());
+      fclose(fp);
+    }
+  }
+
   openlog(prog, LOG_PID | (optF ? LOG_PERROR : 0), LOG_DAEMON);
 
   signal(SIGHUP, Fairwell);