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tftp: fix bad interaction betweel poll() and alarm(). Closes bug 3061

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This was breaking timeout handling.

function                                             old     new   delta
tftp_progress_update                                   -      45     +45
tftp_progress_done                                     -      32     +32
tftp_protocol                                       1839    1858     +19
tftp_progress_init                                     9      15      +6
tftp_main                                            298     286     -12
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 2/1 up/down: 102/-12)            Total: 90 bytes

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2011-01-10 12:51:44 +01:00
parent 7b305646e1
commit 84dba9c5bb
2 changed files with 13 additions and 28 deletions
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39
networking/tftp.c
View File

@ -105,39 +105,22 @@ struct BUG_G_too_big {
#define error_pkt_str (error_pkt + 4)
#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
/* SIGALRM logic nicked from the wget applet */
static void progress_meter(int flag)
static void tftp_progress_update(void)
{
/* We can be called from signal handler */
int save_errno = errno;
if (flag == -1) { /* first call to progress_meter */
bb_progress_init(&G.pmt);
}
bb_progress_update(&G.pmt, G.file, 0, G.pos, G.size);
if (flag == 0) {
/* last call to progress_meter */
alarm(0);
bb_putchar_stderr('\n');
} else {
if (flag == -1) { /* first call to progress_meter */
signal_SA_RESTART_empty_mask(SIGALRM, progress_meter);
}
alarm(1);
}
errno = save_errno;
}
static void tftp_progress_init(void)
{
progress_meter(-1);
bb_progress_init(&G.pmt);
tftp_progress_update();
}
static void tftp_progress_done(void)
{
if (G.pmt.inited)
progress_meter(0);
if (G.pmt.inited) {
tftp_progress_update();
bb_putchar_stderr('\n');
G.pmt.inited = 0;
}
}
#else
# define tftp_progress_init() ((void)0)
@ -460,9 +443,10 @@ static int tftp_protocol(
xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
if (ENABLE_TFTP && remote_file) { /* tftp */
if (ENABLE_TFTP && remote_file) /* tftp */
G.pos = (block_nr - 1) * (uoff_t)blksize;
}
if (G.pmt.inited)
tftp_progress_update();
#endif
/* Was it final ACK? then exit */
if (finished && (opcode == TFTP_ACK))
@ -479,6 +463,7 @@ static int tftp_protocol(
case 0:
retries--;
if (retries == 0) {
tftp_progress_done();
bb_error_msg("timeout");
goto ret; /* no err packet sent */
}