diff options
| -rw-r--r-- | networking/wget.c | 114 |
1 files changed, 62 insertions, 52 deletions
diff --git a/networking/wget.c b/networking/wget.c index 3416636ae..4eafebe40 100644 --- a/networking/wget.c +++ b/networking/wget.c @@ -444,13 +444,10 @@ static void NOINLINE retrieve_file_data(FILE *dfp) { #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT # if ENABLE_FEATURE_WGET_TIMEOUT - unsigned second_cnt; + unsigned second_cnt = G.timeout_seconds; # endif struct pollfd polldata; -# if ENABLE_FEATURE_WGET_TIMEOUT - second_cnt = G.timeout_seconds; -# endif polldata.fd = fileno(dfp); polldata.events = POLLIN | POLLPRI; #endif @@ -468,7 +465,7 @@ static void NOINLINE retrieve_file_data(FILE *dfp) * which messes up progress bar and/or timeout logic. * Because of nonblocking I/O, we need to dance * very carefully around EAGAIN. See explanation at - * clearerr() call. + * clearerr() calls. */ ndelay_on(polldata.fd); #endif @@ -476,34 +473,7 @@ static void NOINLINE retrieve_file_data(FILE *dfp) int n; unsigned rdsz; - rdsz = sizeof(G.wget_buf); - if (G.got_clen) { - if (G.content_len < (off_t)sizeof(G.wget_buf)) { - if ((int)G.content_len <= 0) - break; - rdsz = (unsigned)G.content_len; - } - } - #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT - if (safe_poll(&polldata, 1, 1000) == 0) { -# if ENABLE_FEATURE_WGET_TIMEOUT - if (second_cnt != 0 && --second_cnt == 0) { - progress_meter(PROGRESS_END); - bb_error_msg_and_die("download timed out"); - } -# endif - /* Needed for "stalled" indicator */ - progress_meter(PROGRESS_BUMP); - /* - * We used to loop back to poll here, - * but in chunked case, we can be here after - * fgets and it could buffer some data in dfp... - * which poll knows nothing about! - * Therefore let's try fread'ing anyway. - */ - } - /* fread internally uses read loop, which in our case * is usually exited when we get EAGAIN. * In this case, libc sets error marker on the stream. @@ -513,38 +483,71 @@ static void NOINLINE retrieve_file_data(FILE *dfp) * into if (n <= 0) ... */ clearerr(dfp); - errno = 0; #endif + errno = 0; + rdsz = sizeof(G.wget_buf); + if (G.got_clen) { + if (G.content_len < (off_t)sizeof(G.wget_buf)) { + if ((int)G.content_len <= 0) + break; + rdsz = (unsigned)G.content_len; + } + } n = fread(G.wget_buf, 1, rdsz, dfp); - /* man fread: + + if (n > 0) { + xwrite(G.output_fd, G.wget_buf, n); +#if ENABLE_FEATURE_WGET_STATUSBAR + G.transferred += n; +#endif + if (G.got_clen) { + G.content_len -= n; + if (G.content_len == 0) + break; + } +#if ENABLE_FEATURE_WGET_TIMEOUT + second_cnt = G.timeout_seconds; +#endif + continue; + } + + /* n <= 0. + * man fread: * If error occurs, or EOF is reached, the return value * is a short item count (or zero). * fread does not distinguish between EOF and error. */ - if (n <= 0) { -#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT - if (errno == EAGAIN) /* poll lied, there is no data? */ - continue; /* yes */ -#endif - if (ferror(dfp)) + if (errno != EAGAIN) { + if (ferror(dfp)) { + progress_meter(PROGRESS_END); bb_perror_msg_and_die(bb_msg_read_error); + } break; /* EOF, not error */ } - xwrite(G.output_fd, G.wget_buf, n); -#if ENABLE_FEATURE_WGET_TIMEOUT - second_cnt = G.timeout_seconds; -#endif -#if ENABLE_FEATURE_WGET_STATUSBAR - G.transferred += n; +#if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT + /* It was EAGAIN. There is no data. Wait up to one second + * then abort if timed out, or update the bar and try reading again. + */ + if (safe_poll(&polldata, 1, 1000) == 0) { +# if ENABLE_FEATURE_WGET_TIMEOUT + if (second_cnt != 0 && --second_cnt == 0) { + progress_meter(PROGRESS_END); + bb_error_msg_and_die("download timed out"); + } +# endif + /* We used to loop back to poll here, + * but there is no great harm in letting fread + * to try reading anyway. + */ + } + /* Need to do it _every_ second for "stalled" indicator + * to be shown properly. + */ progress_meter(PROGRESS_BUMP); #endif - if (G.got_clen) { - G.content_len -= n; - if (G.content_len == 0) - break; - } - } + } /* while (reading data) */ + #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT clearerr(dfp); ndelay_off(polldata.fd); /* else fgets can get very unhappy */ @@ -560,6 +563,13 @@ static void NOINLINE retrieve_file_data(FILE *dfp) if (G.content_len == 0) break; /* all done! */ G.got_clen = 1; + /* + * Note that fgets may result in some data being buffered in dfp. + * We loop back to fread, which will retrieve this data. + * Also note that code has to be arranged so that fread + * is done _before_ one-second poll wait - poll doesn't know + * about stdio buffering and can result in spurious one second waits! + */ } /* If -c failed, we restart from the beginning, |