usr/src/cmd/dtrace/test/tst/common/pid/tst.weak1.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <signal.h>
  30 #include <unistd.h>
  31
  32 /*
  33  * The canonical name should be 'go' since we prefer symbol names with fewer
  34  * leading underscores.
  35  */
  36
  37 #pragma weak _go = go
  38
  39 int
  40 go(int a)
  41 {
  42         return (a + 1);
  43 }
  44
  45 static void
  46 handle(int sig)
  47 {
  48         _go(1);
  49         exit(0);
  50 }
  51
  52 int
  53 main(int argc, char **argv)
  54 {
  55         (void) signal(SIGUSR1, handle);
  56         for (;;)
  57                 getpid();
  58 }