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#include "signal.h"
#include <sys/eventfd.h>
#include <poll.h>
#include <inttypes.h>
#include <errno.h>
#include <unistd.h>
int signal_new()
{
return eventfd( 0, EFD_NONBLOCK );
}
int signal_call(int signalFd)
{
static uint64_t one = 1;
return write( signalFd, &one, sizeof one ) == sizeof one;
}
int signal_wait(int signalFd, int timeoutMs)
{
struct pollfd ps = {
.fd = signalFd,
.events = POLLIN
};
int ret = poll( &ps, 1, timeoutMs );
if ( ret == 0 ) return SIGNAL_TIMEOUT;
if ( ret == -1 ) return SIGNAL_ERROR;
if ( ps.revents & ( POLLERR | POLLNVAL ) ) return SIGNAL_ERROR;
return signal_clear( signalFd );
}
int signal_clear(int signalFd)
{
uint64_t ret;
if ( read( signalFd, &ret, sizeof ret ) != sizeof ret ) {
if ( errno == EAGAIN ) return 0;
return SIGNAL_ERROR;
}
return (int)ret;
}
void signal_close(int signalFd)
{
close( signalFd );
}
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