introduce safe_poll (fixes a problem in top)

function                                             old     new   delta
safe_poll                                              -      77     +77
svlogd_main                                         1470    1466      -4
zcip_main                                           1530    1524      -6
forkexec                                            1345    1338      -7
decode_format_string                                 795     788      -7
collect_blk                                          474     467      -7
buffer_pread                                         540     532      -8
tftp                                                1182    1172     -10
microcom_main                                        763     749     -14
arpping                                              441     424     -17
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/9 up/down: 77/-80)             Total: -3 bytes
   text    data     bss     dec     hex filename
 770162    1034   10404  781600   bed20 busybox_old
 770158    1034   10404  781596   bed1c busybox_unstripped

1 files changed, 2 insertions, 5 deletions

diff --git a/networking/udhcp/arpping.c b/networking/udhcp/arpping.c
index 33518077b..7b702d8f3 100644
--- a/networking/udhcp/arpping.c
+++ b/networking/udhcp/arpping.c
@@ -81,12 +81,9 @@ int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *i
                 unsigned prevTime = monotonic_us();
 
                 pfd[0].events = POLLIN;
-                r = poll(pfd, 1, timeout_ms);
+                r = safe_poll(pfd, 1, timeout_ms);
                 if (r < 0) {
-                        if (errno != EINTR) {
-                                bb_perror_msg("poll");
-                                break;
-                        }
+                        break;
                 } else if (r) {
                         if (read(s, &arp, sizeof(arp)) < 0)
                                 break;