58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/***********************************************************************/
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/* */
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/* Caml Special Light */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1995 Institut National de Recherche en Informatique et */
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/* Automatique. Distributed only by permission. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <stdio.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <errno.h>
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#include "s.h"
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int signalled;
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void sigio_handler(arg)
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int arg;
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{
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signalled = 1;
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}
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int main()
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{
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#if defined(SIGIO) && defined(FASYNC) && defined(F_SETFL) && defined(F_SETOWN)
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int p[2];
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int ret;
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#define OUT 0
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#define IN 1
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if (pipe(p) == -1) return 1;
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signalled = 0;
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signal(SIGIO, sigio_handler);
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ret = fcntl(p[OUT], F_GETFL, 0);
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fcntl(p[OUT], F_SETFL, ret | FASYNC);
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fcntl(p[OUT], F_SETOWN, getpid());
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switch(fork()) {
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case -1:
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return 1;
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case 0:
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close(p[OUT]);
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write(p[IN], "x", 1);
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sleep(1);
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exit(0);
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default:
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close(p[IN]);
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while(wait(NULL) == -1 && errno == EINTR) /*nothing*/;
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}
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if (signalled) return 0; else return 1;
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#else
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return 1;
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#endif
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}
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