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#define _GNU_SOURCE
#include "ytdlsb-tasks.h"
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <curl/curl.h>
static void get_now(struct timespec *t){
CKAP(clock_gettime(CLOCK_MONOTONIC, t));
}
static void set_time_ms(struct timespec *dst, int ms){
dst->tv_sec = ms / 1000;
dst->tv_nsec = ms % 1000 * 1000 * 1000;
}
static int get_time_ms(struct timespec *src){
if((INT_MAX - 999) / 1000 < src->tv_sec){
return (INT_MAX - 999) / 1000 * 1000; // lazy saturation
}
return (int)src->tv_sec * 1000 + src->tv_nsec / 1000 / 1000;
}
static void copy_time(struct timespec *dst, struct timespec *src){
memcpy(dst, src, sizeof(*dst));
}
static void add_time(struct timespec *dst, struct timespec *src){
dst->tv_sec += src->tv_sec;
dst->tv_nsec -= 1000 * 1000 * 1000;
dst->tv_nsec += src->tv_nsec;
if(dst->tv_nsec < 0) dst->tv_nsec += 1000 * 1000 * 1000;
else dst->tv_sec += 1;
}
static void sub_time(struct timespec *dst, struct timespec *src){
dst->tv_sec -= src->tv_sec;
dst->tv_nsec -= src->tv_nsec;
if(src->tv_nsec < 0){
dst->tv_sec -= 1;
dst->tv_nsec += 1000 * 1000 * 1000;
}
}
static int lt_time(struct timespec *lt, struct timespec *gt){
return lt->tv_sec < gt->tv_sec
|| lt->tv_sec == gt->tv_sec && lt->tv_nsec < gt->tv_nsec;
}
int ytdlsb_task_timeout_ms(struct ytdlsb_task *task, int ms){
struct timespec a;
set_time_ms(&a, ms);
get_now(&task->timeout);
add_time(&task->timeout, &a);
return 0;
}
int ytdlsb_task_timeout_ms_min(struct ytdlsb_task *task, int ms){
struct timespec a, now;
get_now(&now);
set_time_ms(&a, ms);
add_time(&a, &now);
if(get_time_ms(&task->timeout) == 0 || lt_time(&a, &task->timeout)){
copy_time(&task->timeout, &a);
}
return 0;
}
int ytdlsb_task_timeout_unset(struct ytdlsb_task *task){
set_time_ms(&task->timeout, 0);
return 0;
}
int ytdlsb_tasks_step(struct ytdlsb_tasks *tasks){
int ret = -1;
struct pollfd *fds = NULL;
size_t *fdso = NULL;
struct timespec now;
size_t last_fd = 0;
get_now(&now);
fdso = CKAR(reallocarray(NULL, tasks->task_num, sizeof(*fdso)));
int timeout = -1;
nfds_t nfds = 0;
for(size_t i = 0; i < tasks->task_num; i++){
struct ytdlsb_task *t = &tasks->tasks[i];
if(!t->process){
fdso[i] = nfds;
continue;
}
if(get_time_ms(&t->timeout) == 0){
// do nothing
}else if(lt_time(&t->timeout, &now)){
timeout = 0;
}else{
struct timespec tdiff;
copy_time(&tdiff, &t->timeout);
sub_time(&tdiff, &now);
int ms = get_time_ms(&tdiff);
if(timeout == -1 || timeout < ms) timeout = ms;
}
fdso[i] = nfds + t->pollfd_num;
if(t->pollfd_num){
nfds += t->pollfd_num;
fds = CKAR(reallocarray(fds, nfds, sizeof(*fds)));
for(size_t j = 0; j < t->pollfd_num; j++){
struct pollfd *dst = &fds[nfds - t->pollfd_num + j];
dst->fd = t->pollfd[j].fd;
dst->events = t->pollfd[j].events;
}
}
}
CKP(err, poll(fds, nfds, timeout));
get_now(&now);
for(size_t i = 0; i < tasks->task_num; i++){
struct ytdlsb_task *t = &tasks->tasks[i];
int want_call = 0;
if(get_time_ms(&t->timeout) && lt_time(&t->timeout, &now))
want_call |= 1;
for(size_t j = last_fd; !want_call && j < fdso[i]; j++){
short er = fds[j].events;
short re = fds[j].revents;
CK(err, re & POLLNVAL, == 0);
want_call |= re&POLLHUP || re&POLLERR;
want_call |= er&POLLIN && re&POLLIN;
want_call |= er&POLLOUT && re&POLLOUT;
want_call |= er&POLLPRI && re&POLLPRI;
}
if(t->process && want_call){
CKP(err, t->process(t));
}
last_fd = fdso[i];
}
ret = 0;
err:
free(fds);
free(fdso);
return ret;
}
struct ytdlsb_task_event{
int pipe[2];
int (*cb)(void *);
void *data;
};
static int ytdlsb_task_event_cb(struct ytdlsb_task *t){
struct ytdlsb_task_event *e = t->data;
ssize_t rs;
while(1){
int buf;
rs = read(e->pipe[0], &buf, sizeof(buf));
if(rs == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)) break;
CK_MSG(err, rs, > 0, "pipe read error");
}
return e->cb(e->data) < 0 ? -1 : 0;
err: return -1;
}
int ytdlsb_task_event_init(
struct ytdlsb_task *task, int (*cb)(void *), void *data
){
int ret = -1;
struct ytdlsb_task_event *e;
e = CKAR(malloc(sizeof(*e)));
CKP(err, pipe2(e->pipe, O_CLOEXEC|O_NONBLOCK));
e->cb = cb;
e->data = data;
task->process = ytdlsb_task_event_cb;
task->pollfd = CKAR(malloc(sizeof(*task->pollfd)));
task->pollfd[0].fd = e->pipe[0];
task->pollfd[0].events = YTDLSB_POLLIN;
task->pollfd_num = 1;
task->data = e;
e = NULL;
ret = 0;
err:
free(e);
return ret;
}
void ytdlsb_task_event_destroy(struct ytdlsb_task *task){
struct ytdlsb_task_event *e = task->data;
CKAP(close(e->pipe[0]));
CKAP(close(e->pipe[1]));
free(e);
free(task->pollfd);
}
int ytdlsb_task_event_wake(struct ytdlsb_task *task){
struct ytdlsb_task_event *e = task->data;
ssize_t ws = write(e->pipe[1], "\n", 1);
if(ws == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)) return 0;
CK_MSG(err, ws, > 0, "pipe write error");
return 0;
err:
return -1;
}
int ytdlsb_task_fdto_from_curl(
struct ytdlsb_task *task, size_t off, int overwrite_timeout, CURLM* cm
){
int ret = -1;
unsigned int ncfds = 0;
struct curl_waitfd *cfds = NULL;
long timeout;
CKZ(err, curl_multi_timeout(cm, &timeout));
if(overwrite_timeout && timeout < 0){
CKP(err, ytdlsb_task_timeout_unset(task));
}else if(overwrite_timeout){
CKP(err, ytdlsb_task_timeout_ms(task, TRY_NUMCAST(err, int, timeout)));
}else{
CKP(err, ytdlsb_task_timeout_ms_min(task,
TRY_NUMCAST(err, int, timeout)));
}
CKZ(err, curl_multi_waitfds(cm, NULL, 0, &ncfds));
if(ncfds == 0){
task->pollfd_num = off;
return 0;
}
cfds = CKAR(reallocarray(NULL, ncfds, sizeof(*cfds)));
CKZ(err, curl_multi_waitfds(cm, cfds, ncfds, NULL));
task->pollfd = CKAR(reallocarray(task->pollfd,
off+ncfds, sizeof(*task->pollfd)));
for(size_t i = 0; i < ncfds; i++){
task->pollfd[off+i].fd = cfds[i].fd;
task->pollfd[off+i].events = 0;
#define PT(t) if(cfds[i].fd & CURL_WAIT_POLL ## t) \
task->pollfd[off+i].events |= YTDLSB_POLL ## t
PT(IN);
PT(PRI);
PT(OUT);
#undef PT
}
task->pollfd_num = off + ncfds;
ret = ncfds;
err:
free(cfds);
return ret;
}
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