ocaml/config/auto-aux/async_io.c

59 lines
1.7 KiB
C

/***********************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "s.h"
int signalled;
void sigio_handler(int arg)
{
signalled = 1;
}
int main(void)
{
#if defined(SIGIO) && defined(FASYNC) && defined(F_SETFL) && defined(F_SETOWN)
int p[2];
int ret;
#define OUT 0
#define IN 1
if (socketpair(PF_UNIX, SOCK_STREAM, 0, p) == -1) return 1;
signalled = 0;
signal(SIGIO, sigio_handler);
ret = fcntl(p[OUT], F_GETFL, 0);
fcntl(p[OUT], F_SETFL, ret | FASYNC);
fcntl(p[OUT], F_SETOWN, getpid());
switch(fork()) {
case -1:
return 1;
case 0:
close(p[OUT]);
write(p[IN], "x", 1);
sleep(1);
exit(0);
default:
close(p[IN]);
while(wait(NULL) == -1 && errno == EINTR) /*nothing*/;
}
if (signalled) return 0; else return 1;
#else
return 1;
#endif
}