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#if defined(LIBEV_EMBED)
#include "ev.c"
#else
#include "ev.h"
#ifndef _WIN32
#include <signal.h>
#endif
#endif
#ifndef _WIN32
static struct sigaction libev_sigchld;
/*
* Track the state of whether we have installed
* the libev sigchld handler specifically.
* If it's non-zero, libev_sigchld will be valid and set to the action
* that libev needs to do.
* If it's 1, we need to install libev_sigchld to make libev
* child handlers work (on request).
*/
static int sigchld_state = 0;
static struct ev_loop* gevent_ev_default_loop(unsigned int flags)
{
struct ev_loop* result;
struct sigaction tmp;
if (sigchld_state)
return ev_default_loop(flags);
// Request the old SIGCHLD handler
sigaction(SIGCHLD, NULL, &tmp);
// Get the loop, which will install a SIGCHLD handler
result = ev_default_loop(flags);
// XXX what if SIGCHLD received there?
// Now restore the previous SIGCHLD handler
sigaction(SIGCHLD, &tmp, &libev_sigchld);
sigchld_state = 1;
return result;
}
static void gevent_install_sigchld_handler(void) {
if (sigchld_state == 1) {
sigaction(SIGCHLD, &libev_sigchld, NULL);
sigchld_state = 2;
}
}
static void gevent_reset_sigchld_handler(void) {
// We could have any state at this point, depending on
// whether the default loop has been used. If it has,
// then always be in state 1 ("need to install)
if (sigchld_state) {
sigchld_state = 1;
}
}
#else
#define gevent_ev_default_loop ev_default_loop
static void gevent_install_sigchld_handler(void) { }
#endif
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