*: replace select-for-one descriptor with poll, it's smaller.

$ ./.cmk bloatcheck
function                                             old     new   delta
readit                                               406     364     -42
syslogd_main                                        1249    1206     -43
traceroute_main                                     4115    4060     -55
mysleep                                              112      45     -67
arpping                                              579     441    -138
tftp                                                1575    1182    -393
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/6 up/down: 0/-738)           Total: -738 bytes
   text    data     bss     dec     hex filename
 770580    1051   10764  782395   bf03b busybox_old
 769820    1051   10764  781635   bed43 busybox_unstripped

1 files changed, 10 insertions, 10 deletions

diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c
index 5b153f509..ae3f1a2eb 100644
--- a/sysklogd/syslogd.c
+++ b/sysklogd/syslogd.c
@@ -471,8 +471,8 @@ static void do_syslogd(void) ATTRIBUTE_NORETURN;
 static void do_syslogd(void)
 {
         struct sockaddr_un sunx;
-        int sock_fd;
-        fd_set fds;
+        struct pollfd pfd[1];
+#define sock_fd (pfd[0].fd)
         char *dev_log_name;
 
         /* Set up signal handlers */
@@ -526,20 +526,20 @@ static void do_syslogd(void)
                         (char*)"syslogd started: BusyBox v" BB_VER, 0);
 
         for (;;) {
-                FD_ZERO(&fds);
-                FD_SET(sock_fd, &fds);
-
-                if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
+                /*pfd[0].fd = sock_fd;*/
+                pfd[0].events = POLLIN;
+                pfd[0].revents = 0;
+                if (poll(pfd, 1, -1) < 0) { /* -1: no timeout */
                         if (errno == EINTR) {
                                 /* alarm may have happened */
                                 continue;
                         }
-                        bb_perror_msg_and_die("select");
+                        bb_perror_msg_and_die("poll");
                 }
 
-                if (FD_ISSET(sock_fd, &fds)) {
+                if (pfd[0].revents) {
                         int i;
-                        i = recv(sock_fd, G.recvbuf, MAX_READ - 1, 0);
+                        i = read(sock_fd, G.recvbuf, MAX_READ - 1);
                         if (i <= 0)
                                 bb_perror_msg_and_die("UNIX socket error");
                         /* TODO: maybe suppress duplicates? */
@@ -559,7 +559,7 @@ static void do_syslogd(void)
 #endif
                         G.recvbuf[i] = '\0';
                         split_escape_and_log(G.recvbuf, i);
-                } /* FD_ISSET() */
+                }
         } /* for */
 }