X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/adns/blobdiff_plain/bef232aebeabbef525faa7d7f5b08cf7a1427f95..8e5a4960dc66700c71644d188ff9aa4ec250782d:/client/adnslogres.c

diff --git a/client/adnslogres.c b/client/adnslogres.c
index 3aa7e0e..a91127b 100644
--- a/client/adnslogres.c
+++ b/client/adnslogres.c
@@ -218,9 +218,13 @@ static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
   adns_finish(adns);
 }
 
-static void usage(void) {
-  fprintf(stderr, "usage: %s [-d] [-p] [-c concurrency] [-C config] [logfile]\n",
+static void printhelp(FILE *file) {
+  fprintf(file, "usage: %s [-d] [-p] [-c concurrency] [-C config] [logfile]\n",
 	  progname);
+}
+
+static void usage(void) {
+  printhelp(stderr);
   exit(1);
 }
 
@@ -229,6 +233,12 @@ int main(int argc, char *argv[]) {
   extern char *optarg;
   FILE *inf;
 
+  if (argv[1] && !strcmp(argv[1],"--help")) {
+    printhelp(stdout);
+    if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
+    exit(0);
+  }
+
   maxpending= DEFMAXPENDING;
   opts= 0;
   while ((c= getopt(argc, argv, "c:C:dp")) != -1)