On Tue, May 29, 2012 at 10:08 PM, Marc Lehmann <schm...@schmorp.de> wrote:
> You also don't call waitpid on your children - can you add error checking
> to all functions you call, to make sure you really do wait for your
> children (especially check fork returns)? Most likely you run out of
> process slots and fork fails, which your code "misinterprets" as a hang.
No, it's not that. Attached is the program that checks the error codes
and also waits for a child using child watcher. Still fails.
/* gcc -DEV_STANDALONE=1 testsigchld.c -o testsigchld
*
* Expected output: infinite sequence of "*."
*
* Actual output:
* denis@denis-laptop:~/work/libev-cvs$ ./testsigchld
* *.*.*.Alarm clock
*
* (number of iterations is different each time)
*
* */
#include "ev.c"
void stop_child(struct ev_loop* loop, ev_child *w, int revents) {
ev_child_stop(loop, w);
}
int CHECK(int retcode) {
if (retcode < 0) {
perror("fail");
_exit(1);
}
return retcode;
}
void subprocess(void) {
int pid;
if (pid = CHECK(fork())) {
struct ev_child child;
ev_child_init(&child, stop_child, pid, 0);
ev_child_start(EV_DEFAULT, &child);
ev_run(EV_DEFAULT, 0);
CHECK(fprintf(stderr, "*"));
}
else {
_exit(0);
}
}
void test_main(void) {
int pid = CHECK(fork());
if (!pid) {
ev_loop_fork(EV_DEFAULT);
subprocess();
_exit(0);
}
alarm(5);
struct ev_child child;
ev_child_init(&child, stop_child, pid, 0);
ev_child_start(EV_DEFAULT, &child);
ev_run(EV_DEFAULT, 0);
alarm(0);
}
int main(int argc, char** argv) {
ev_default_loop(EVBACKEND_SELECT);
while (1) {
test_main();
CHECK(fprintf(stderr, "."));
}
}
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