examples/hiperfifo.c: improved
* use member struct event’s instead of pointers to alloc’d struct events * simplify the cases for the mcode_or_die() function via macros; * make multi_timer_cb() actually do what the block comment says it should; * accept a “stop” command on the FIFO to shut down the service; * use cleaner notation for unused variables than the (void) hack; * allow following redirections (304’s);
This commit is contained in:
Родитель
f5700ea88b
Коммит
9434194be8
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@ -66,10 +66,17 @@ callback.
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#include <sys/poll.h>
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#include <curl/curl.h>
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#include <event2/event.h>
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#include <event2/event_struct.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <sys/cdefs.h>
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#ifdef __GNUC__
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#define _Unused __attribute__((unused))
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#else
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#define _Unused
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#endif
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#define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
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@ -78,11 +85,12 @@ callback.
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typedef struct _GlobalInfo
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{
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struct event_base *evbase;
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struct event *fifo_event;
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struct event *timer_event;
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struct event fifo_event;
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struct event timer_event;
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CURLM *multi;
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int still_running;
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FILE *input;
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int stopped;
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} GlobalInfo;
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@ -103,16 +111,42 @@ typedef struct _SockInfo
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CURL *easy;
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int action;
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long timeout;
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struct event *ev;
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int evset;
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struct event ev;
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GlobalInfo *global;
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} SockInfo;
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#define __case(code) \
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case code: s = __STRING(code)
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/* Die if we get a bad CURLMcode somewhere */
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static void mcode_or_die(const char *where, CURLMcode code)
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{
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if(CURLM_OK != code) {
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const char *s;
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switch(code) {
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__case(CURLM_BAD_HANDLE); break;
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__case(CURLM_BAD_EASY_HANDLE); break;
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__case(CURLM_OUT_OF_MEMORY); break;
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__case(CURLM_INTERNAL_ERROR); break;
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__case(CURLM_UNKNOWN_OPTION); break;
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__case(CURLM_LAST); break;
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default: s = "CURLM_unknown"; break;
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__case(CURLM_BAD_SOCKET);
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fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
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/* ignore this error */
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return;
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}
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fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
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exit(code);
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}
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}
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/* Update the event timer after curl_multi library calls */
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static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
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static int multi_timer_cb(CURLM *multi _Unused, long timeout_ms, GlobalInfo *g)
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{
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struct timeval timeout;
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(void)multi; /* unused */
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CURLMcode rc;
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timeout.tv_sec = timeout_ms/1000;
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timeout.tv_usec = (timeout_ms%1000)*1000;
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@ -127,35 +161,17 @@ static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
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* for all other values of timeout_ms, this should set or *update*
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* the timer to the new value
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*/
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evtimer_add(g->timer_event, &timeout);
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if (timeout_ms == 0) {
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rc = curl_multi_socket_action(g->multi,
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CURL_SOCKET_TIMEOUT, 0, &g->still_running);
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mcode_or_die("multi_timer_cb: curl_multi_socket_action", rc);
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} else if (timeout_ms == -1)
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evtimer_del(&g->timer_event);
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else
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evtimer_add(&g->timer_event, &timeout);
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return 0;
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}
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/* Die if we get a bad CURLMcode somewhere */
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static void mcode_or_die(const char *where, CURLMcode code)
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{
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if(CURLM_OK != code) {
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const char *s;
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switch(code) {
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case CURLM_BAD_HANDLE: s = "CURLM_BAD_HANDLE"; break;
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case CURLM_BAD_EASY_HANDLE: s = "CURLM_BAD_EASY_HANDLE"; break;
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case CURLM_OUT_OF_MEMORY: s = "CURLM_OUT_OF_MEMORY"; break;
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case CURLM_INTERNAL_ERROR: s = "CURLM_INTERNAL_ERROR"; break;
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case CURLM_UNKNOWN_OPTION: s = "CURLM_UNKNOWN_OPTION"; break;
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case CURLM_LAST: s = "CURLM_LAST"; break;
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default: s = "CURLM_unknown";
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break;
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case CURLM_BAD_SOCKET: s = "CURLM_BAD_SOCKET";
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fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
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/* ignore this error */
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return;
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}
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fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
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exit(code);
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}
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}
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/* Check for completed transfers, and remove their easy handles */
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static void check_multi_info(GlobalInfo *g)
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@ -181,6 +197,8 @@ static void check_multi_info(GlobalInfo *g)
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free(conn);
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}
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}
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if (g->still_running == 0 && g->stopped)
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event_base_loopbreak(g->evbase);
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}
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@ -201,8 +219,8 @@ static void event_cb(int fd, short kind, void *userp)
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check_multi_info(g);
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if(g->still_running <= 0) {
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fprintf(MSG_OUT, "last transfer done, kill timeout\n");
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if(evtimer_pending(g->timer_event, NULL)) {
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evtimer_del(g->timer_event);
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if(evtimer_pending(&g->timer_event, NULL)) {
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evtimer_del(&g->timer_event);
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}
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}
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}
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@ -210,12 +228,10 @@ static void event_cb(int fd, short kind, void *userp)
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/* Called by libevent when our timeout expires */
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static void timer_cb(int fd, short kind, void *userp)
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static void timer_cb(int fd _Unused, short kind _Unused, void *userp)
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{
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GlobalInfo *g = (GlobalInfo *)userp;
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CURLMcode rc;
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(void)fd;
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(void)kind;
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rc = curl_multi_socket_action(g->multi,
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CURL_SOCKET_TIMEOUT, 0, &g->still_running);
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@ -229,8 +245,7 @@ static void timer_cb(int fd, short kind, void *userp)
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static void remsock(SockInfo *f)
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{
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if(f) {
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if(f->evset)
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event_free(f->ev);
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event_del(&f->ev);
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free(f);
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}
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}
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@ -247,11 +262,9 @@ static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
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f->sockfd = s;
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f->action = act;
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f->easy = e;
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if(f->evset)
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event_free(f->ev);
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f->ev = event_new(g->evbase, f->sockfd, kind, event_cb, g);
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f->evset = 1;
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event_add(f->ev, NULL);
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event_del(&f->ev);
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event_assign(&f->ev, g->evbase, f->sockfd, kind, event_cb, g);
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event_add(&f->ev, NULL);
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}
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@ -297,23 +310,20 @@ static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
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/* CURLOPT_WRITEFUNCTION */
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static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
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static size_t write_cb(void *ptr _Unused, size_t size, size_t nmemb, void *data)
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{
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size_t realsize = size * nmemb;
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ConnInfo *conn = (ConnInfo*) data;
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(void)ptr;
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(void)conn;
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ConnInfo *conn _Unused = (ConnInfo*) data;
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return realsize;
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}
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/* CURLOPT_PROGRESSFUNCTION */
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static int prog_cb(void *p, double dltotal, double dlnow, double ult,
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double uln)
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static int prog_cb(void *p, double dltotal, double dlnow, double ult _Unused,
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double uln _Unused)
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{
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ConnInfo *conn = (ConnInfo *)p;
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(void)ult;
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(void)uln;
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fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
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return 0;
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@ -346,6 +356,7 @@ static void new_conn(char *url, GlobalInfo *g)
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curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
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curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
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curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
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curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1L);
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fprintf(MSG_OUT,
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"Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
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rc = curl_multi_add_handle(g->multi, conn->easy);
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@ -356,21 +367,24 @@ static void new_conn(char *url, GlobalInfo *g)
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}
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/* This gets called whenever data is received from the fifo */
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static void fifo_cb(int fd, short event, void *arg)
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static void fifo_cb(int fd _Unused, short event _Unused, void *arg)
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{
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char s[1024];
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long int rv = 0;
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int n = 0;
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GlobalInfo *g = (GlobalInfo *)arg;
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(void)fd; /* unused */
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(void)event; /* unused */
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do {
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s[0]='\0';
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rv = fscanf(g->input, "%1023s%n", s, &n);
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s[n]='\0';
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if(n && s[0]) {
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new_conn(s, arg); /* if we read a URL, go get it! */
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if (!strcmp(s, "stop")) {
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g->stopped = 1;
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if (g->still_running == 0)
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event_base_loopbreak(g->evbase);
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} else
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new_conn(s, arg); /* if we read a URL, go get it! */
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}
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else
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break;
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@ -405,29 +419,27 @@ static int init_fifo(GlobalInfo *g)
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g->input = fdopen(sockfd, "r");
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fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
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g->fifo_event = event_new(g->evbase, sockfd, EV_READ|EV_PERSIST, fifo_cb, g);
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event_add(g->fifo_event, NULL);
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event_assign(&g->fifo_event, g->evbase, sockfd, EV_READ|EV_PERSIST, fifo_cb, g);
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event_add(&g->fifo_event, NULL);
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return (0);
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}
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static void clean_fifo(GlobalInfo *g)
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{
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event_free(g->fifo_event);
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event_del(&g->fifo_event);
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fclose(g->input);
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unlink(fifo);
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}
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int main(int argc, char **argv)
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int main(int argc _Unused, char **argv _Unused)
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{
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GlobalInfo g;
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(void)argc;
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(void)argv;
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memset(&g, 0, sizeof(GlobalInfo));
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g.evbase = event_base_new();
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init_fifo(&g);
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g.multi = curl_multi_init();
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g.timer_event = evtimer_new(g.evbase, timer_cb, &g);
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evtimer_assign(&g.timer_event, g.evbase, timer_cb, &g);
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/* setup the generic multi interface options we want */
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curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
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@ -443,7 +455,7 @@ int main(int argc, char **argv)
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/* this, of course, won't get called since only way to stop this program is
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via ctrl-C, but it is here to show how cleanup /would/ be done. */
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clean_fifo(&g);
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event_free(g.timer_event);
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event_del(&g.timer_event);
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event_base_free(g.evbase);
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curl_multi_cleanup(g.multi);
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return 0;
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