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bb_info_msg: make it do atomic, unbuffered writes

Browse Source 
udhcpc: fix a problem where we don't open listening socket fast enough

function                                             old     new   delta
bb_info_msg                                           70     126     +56
change_listen_mode                                    37      78     +41
udhcp_listen_socket                                  151     124     -27
udhcpc_main                                         2344    2285     -59
This commit is contained in:
Denis Vlasenko 2008-12-10 11:16:47 +00:00
parent e53738558f
commit 517413f9af
2 changed files with 42 additions and 7 deletions
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26
libbb/info_msg.c
View File

@ -12,6 +12,7 @@
void FAST_FUNC bb_info_msg(const char *s, ...)
{
#ifdef THIS_ONE_DOESNT_DO_SINGLE_WRITE
va_list p;
/* va_copy is used because it is not portable
* to use va_list p twice */
@ -27,4 +28,29 @@ void FAST_FUNC bb_info_msg(const char *s, ...)
vsyslog(LOG_INFO, s, p2);
va_end(p2);
va_end(p);
#else
int used;
char *msg;
va_list p;
if (logmode == 0)
return;
va_start(p, s);
used = vasprintf(&msg, s, p);
if (used < 0)
return;
if (ENABLE_FEATURE_SYSLOG && (logmode & LOGMODE_SYSLOG))
syslog(LOG_INFO, "%s", msg);
if (logmode & LOGMODE_STDIO) {
fflush(stdout);
/* used = strlen(msg); - must be true already */
msg[used++] = '\n';
full_write(STDOUT_FILENO, msg, used);
}
free(msg);
va_end(p);
#endif
}

23
networking/udhcp/dhcpc.c
View File

@ -43,11 +43,17 @@ static void change_listen_mode(int new_mode)
{
DEBUG("entering %s listen mode",
new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
listen_mode = new_mode;
if (sockfd >= 0) {
close(sockfd);
sockfd = -1;
}
listen_mode = new_mode;
if (new_mode == LISTEN_KERNEL)
sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
else if (new_mode != LISTEN_NONE)
sockfd = udhcp_raw_socket(client_config.ifindex);
/* else LISTEN_NONE: sockfd stay closed */
}
@ -320,12 +326,15 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
for (;;) {
unsigned timestamp_before_wait;
if (listen_mode != LISTEN_NONE && sockfd < 0) {
if (listen_mode == LISTEN_KERNEL)
sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
else
sockfd = udhcp_raw_socket(client_config.ifindex);
}
//bb_error_msg("sockfd:%d, listen_mode:%d", sockfd, listen_mode);
/* Was opening raw or udp socket here
* if (listen_mode != LISTEN_NONE && sockfd < 0),
* but on fast network renew responses return faster
* than we open sockets. Thus this code is moved
* to change_listen_mode(). Thus we open listen socket
* BEFORE we send renew request (see "case BOUND:"). */
max_fd = udhcp_sp_fd_set(&rfds, sockfd);
tv.tv_sec = timeout - already_waited_sec;