text: /*
  
   * Copyright (c) 2002-2003, Intel Corporation. All rights reserved.
   * Created by:  rusty.lynch REMOVE-THIS AT intel DOT com
   * This file is licensed under the GPL license.  For the full content
   * of this license, see the COPYING file at the top level of this 
   * source tree.
  
    Test case for assertion #22 of the sigaction system call that verifies 
    that if the SA_NODEFER flag is set for a given signal, then when the 
    sa_sigaction signal-catching function is entered, then the signal that 
    was caught is not added to the signal mask by raising that signal in the 
    signal handler and verifying that the handler is reentered.
    
    Steps:
    1. Fork a new process
    2. (parent) wait for child
    3. (child) Setup a signal handler for SIGURG with SA_NODEFER set
       in the sa_flags field
    4. (child) raise SIGURG
    5. (child, signal handler) increment handler count
    6. (child, signal handler) if count is 1 then raise SIGURG
    7. (child, signal handler) if count is 1 then set error variable
    8. (child) if error is set then return -1, else return 0
    6. (parent - returning from wait) If child returned 0 then exit 0,
       otherwise exit -1.
  */
  
  #define _XOPEN_SOURCE 600
  
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <sys/wait.h>
  #include <unistd.h>
  #include "posixtest.h"
  
  int handler_count = 0;
  
  void handler(int signo)
  {
  	static int inside_handler = 0;
  
  	printf("SIGURG caught\n");
  	if (inside_handler) {
  		printf("Signal caught while inside handler\n");
  		exit(0);
  	}
  
  	inside_handler++;
  	handler_count++;
  
  	if (handler_count == 1) {
  		printf("Raising SIGURG\n");
  		raise(SIGURG);
  		printf("Returning from raising SIGURG\n");
  	}
  
  	inside_handler--;
  }
  
  int main()
  {
  	if (fork() == 0) {
  		/* child */
  
  		struct sigaction act;
  
  		act.sa_handler = handler;
  		act.sa_flags = SA_NODEFER;
  		sigemptyset(&act.sa_mask);
  		if (sigaction(SIGURG,  &act, 0) == -1) {
  			perror("Unexpected error while attempting to "
  			       "setup test pre-conditions");
  			return PTS_UNRESOLVED;
  		}
  		
  		if (raise(SIGURG) == -1) {
  			perror("Unexpected error while attempting to "
  			       "setup test pre-conditions");
  			return PTS_UNRESOLVED;
  		}
  
  		return PTS_FAIL;
  	} else {
  		int s; 
  
  		/* parent */
  		if (wait(&s) == -1) {
  			perror("Unexpected error while setting up test "
  			       "pre-conditions");
  			return PTS_UNRESOLVED;
  		}
  
  		if (!WEXITSTATUS(s)) {
  			printf("Test PASSED\n");
  			return PTS_PASS;
  		}
  	}
  
  	printf("Test FAILED\n");
  	return PTS_FAIL;	
  }
  
  