Check return value of select for error

jupinter · Sep 5, 2012 · 3aacef9 · 3aacef9
1 parent bef021a
commit 3aacef9
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/examples_01/01_rot13_server_select.c b/examples_01/01_rot13_server_select.c
@@ -123,7 +123,7 @@ run(void)
  int listener;
  struct fd_state *state[FD_SETSIZE];
  struct sockaddr_in sin;
- int i, n, maxfd;
+ int i, maxfd;
  fd_set readset, writeset, exset;
 
  sin.sin_family = AF_INET;
@@ -177,7 +177,10 @@ run(void)
  }
  }
 
- n = select(maxfd+1, &readset, &writeset, &exset, NULL);
+ if (select(maxfd+1, &readset, &writeset, &exset, NULL) < 0) {
+ perror("select");
+ return;
+ }
 
  if (FD_ISSET(listener, &readset)) {
  struct sockaddr_storage ss;