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/*
* Power debug tool (powerdebug)
*
* Copyright (C) 2016, Linaro Limited.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/epoll.h>
#include "mainloop.h"
static int epfd = -1;
static unsigned short nrhandler;
struct mainloop_data {
mainloop_callback_t cb;
void *data;
int fd;
};
struct mainloop_data **mds;
#define MAX_EVENTS 10
int mainloop(unsigned int timeout)
{
int i, nfds;
struct epoll_event events[MAX_EVENTS];
struct mainloop_data *md;
if (epfd < 0)
return -1;
for (;;) {
nfds = epoll_wait(epfd, events, MAX_EVENTS, timeout);
if (nfds < 0) {
if (errno == EINTR)
continue;
return -1;
}
/*
* A timeout occured. Let's send to ourself a SIGWINCH
* so the window get refreshed automatically. No need
* to use exported functions and this code stay self
* contained.
*/
if (!nfds) {
kill(getpid(), SIGWINCH);
continue;
}
for (i = 0; i < nfds; i++) {
md = events[i].data.ptr;
if (md->cb(md->fd, md->data) > 0)
return 0;
}
}
}
int mainloop_add(int fd, mainloop_callback_t cb, void *data)
{
struct epoll_event ev = {
.events = EPOLLIN,
};
struct mainloop_data *md;
if (fd >= nrhandler) {
mds = realloc(mds, sizeof(*mds) * (fd + 1));
if (!mds)
return -1;
nrhandler = fd + 1;
}
md = malloc(sizeof(*md));
if (!md)
return -1;
md->data = data;
md->cb = cb;
md->fd = fd;
mds[fd] = md;
ev.data.ptr = md;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) < 0) {
free(md);
return -1;
}
return 0;
}
int mainloop_del(int fd)
{
if (fd >= nrhandler)
return -1;
if (epoll_ctl(epfd, EPOLL_CTL_DEL, fd, NULL) < 0)
return -1;
free(mds[fd]);
return 0;
}
int mainloop_init(void)
{
epfd = epoll_create(2);
if (epfd < 0)
return -1;
return 0;
}
void mainloop_fini(void)
{
close(epfd);
}
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