C++ sigset函数代码示例

int main (int argc, char * argv[])
{
	/*Set up some Variables*/
	int parent_PCB_id = argc;
	int fid;
	caddr_t mmap_ptr;
	inputbuf *in_mem_p;
	char c[MAX_CHAR];

	// If parent tells us to terminate, then clean up first
	sigset(SIGINT,in_die);
	
	//Gets id of parents (to signal) and the file id of mmap.
	sscanf(argv[1], "%d", &parent_PCB_id);
	sscanf(argv[2], "%d", &kfid );

	kmmap_ptr =     
		mmap((caddr_t) 0,
		bufsize,
		PROT_READ | PROT_WRITE,
		MAP_SHARED,
		kfid,
		(off_t) 0);
  
	if (kmmap_ptr == MAP_FAILED){
		printf("Child memory map has failed, KB is aborting! Error <%s> ...\n", strerror(errno));
		in_die(0);
	}
	in_mem_p = (inputbuf *) kmmap_ptr;
	buf_index = 0;
	in_mem_p->flag = MEM_EMPTY; // Set the flag to “Buffer Empty”

	do { 
		fgets(c, MAX_CHAR, stdin);  // This only returns when <cr> is pressed
		strcpy(in_mem_p->data, c); // Read in data from buffer
		in_mem_p->flag = MEM_FULL;  // Set the flag
		kill(parent_PCB_id ,SIGUSR1);  // Signal the parent
		buf_index = 0;
		while(in_mem_p->flag == MEM_FULL){
			usleep(100000); // Sleep until the RTX has read the data
		}
	} while(1); // Loops Forever
}

int main()
{
	struct sigaction act;
	act.sa_flags = 0;
	act.sa_handler = myhandler;
	sigemptyset(&act.sa_mask);

	if (sigaction(SIGUSR1, &act, 0) != 0) {
                perror("Unexpected error while using sigaction()");
               	return PTS_UNRESOLVED;
        }

        if (sigset(SIGUSR1,SIG_DFL) != myhandler) {
		printf("Test FAILED: sigset didn't return myhandler even though it was SIGUSR1's original disposition\n");
               	return PTS_FAIL;
        }

	return PTS_PASS;
} 

/*
 * _tt_sigset sets up a signal handler in such a way that the handler
 * is *not* unregistered when the signal handler is entered.  If
 * returns 0 if an error occurs, else 1, and leaves errno set according
 * to the underlying system call (sigaction, signal, sigset.)
 */
int
_tt_sigset(
	int	sig,
	SIG_PF	handler )
{
#if defined(OPT_POSIX_SIGNAL)
/* 
 * There seems to be some controversy over the type of sa_handler in
 * C++ programs.  Everybody\'s man page seems to say it is of type
 * "void (*)()", and that\'s what Solaris does, and I think that\'s what
 * POSIX says, but both HP and IBM define it as the arguably much more
 * useful "void (*)(int)", a/k/a SIG_PF.
 * 
 * [4 Apr 95] Solaris 2.5 has switched to use void (*)(int), which
 * is nice for the long run but causes us some short-run problems
 * as we want this level of the source to compile both on
 * Solaris 2.4 and Solaris 2.5 for a while. To solve this, we use
 * the "sa_sigaction" element of the sigaction structure, which is the
 * three-argument flavor of the function pointer.  This is, strictly, 
 * a lie, but it's safe since our signal handlers never look at the
 * arguments anyway.  sa_sigaction is, fortunately, the same on all
 * Solaris versions.
 * Once the requirement to compile on Solaris 2.4 goes away, we can
 * simply remove the OPT_BUG_SUNOS_5 ifdefs here, leaving only the
 * UnixWare one.
 */
        struct sigaction act;
#if defined(OPT_BUG_SUNOS_5)	
	act.sa_sigaction = (void (*)(int, siginfo_t *, void *)) handler;
#elif defined(OPT_BUG_USL) || defined(OPT_BUG_UXP)
	act.sa_handler = (void (*)()) handler;
#else
        act.sa_handler = handler;
#endif	
	sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
	return 0==sigaction(sig, &act, NULL);
#elif defined(OPT_BSD_SIGNAL)
	return SIG_ERR!=signal(sig, handler);
#else
	return SIG_ERR!=sigset(sig, handler);
#endif
}

int
main(int argc, char * argv[])
{
    if(argc!=2)
    {
        printf("usage: sleep <sleep in seconds>\n");
        printf("used to test sleep() and sending a alarm signal -14 affects process\n");
        printf("the signal will wakeup a process doing sleep and should return");
        printf(" number of seconds left to sleep\n");

        exit(0);
    }

    // set the alaram signal
    //
    sigset(SIGALRM, SIG_IGN);

    unsigned int sleepTime = atoi(argv[1]);

    unsigned int timeSlept;

    time_t currTime = time(NULL);
    struct tm currStruct;
    localtime_r(&currTime, &currStruct);
    printf("current time: %s\n", asctime(&currStruct));

    timeSlept = sleepTime;
    while ((timeSlept = sleep(timeSlept)) != 0)
    {
        // woke up early
        //
        printf("woke up early need to sleep: %u more\n", timeSlept);
        currTime = time(NULL);
        localtime_r(&currTime, &currStruct);
        printf("current time: %s\n", asctime(&currStruct));
    }

    currTime = time(NULL);
    localtime_r(&currTime, &currStruct);
    printf("end time: %s\n", asctime(&currStruct));

    return 0;
}

void pipeback_shell_close (FILE *file)
{
#ifndef NOCLDWAIT
    int wait_status = 0;
#endif
    int cresult = fclose (file);
    if (cresult) fprintf (stderr, "Warning.  Error closing pipeback file.\n");
    if (0 == --Usage)
    {
	if (SIG_ERR == sigset (SIGCHLD, SIG_DFL))
	{
	    fprintf (stderr, 
		 "Warning.  Error resetting SIGCHLD action after pipeback.\n");
	}
#ifndef NOCLDWAIT
    wait (&wait_status);
#endif
    }
}

static void setup(void)
{
	char wdbuf[MAXPATHLEN];

	/*
	 * Make a directory to do this in; ignore error if already exists.
	 * Save starting directory.
	 */
	tst_tmpdir();

	if (getcwd(homedir, sizeof(homedir)) == NULL) {
		tst_brkm(TBROK | TERRNO, NULL, "getcwd() failed");
	}

	parent_pid = getpid();

	if (!fuss[0])
		sprintf(fuss, "%s/ftest03.%d", getcwd(wdbuf, sizeof(wdbuf)),
			getpid());

	mkdir(fuss, 0755);

	if (chdir(fuss) < 0) {
		tst_resm(TBROK, "\tCan't chdir(%s), error %d.", fuss, errno);
		tst_exit();
	}

	/*
	 * Default values for run conditions.
	 */
	iterations = 10;
	nchild = 5;
	csize = K_2;		/* should run with 1, 2, and 4 K sizes */
	max_size = K_1 * K_1;
	misc_intvl = 10;

	if (sigset(SIGTERM, term) == SIG_ERR) {
		perror("sigset failed");
		tst_resm(TBROK, " sigset failed: signo = 15");
		tst_exit();
	}
}

int main(void)
{
    char buf[LINE_LEN];
    pid_t pid;
    int status;

 if(sigset(SIGINT, sigint)== SIG_ERR) 
   perror("sigint"); 

    printf("->:");
    
    for(;;)
    {
        while(fgets(buf,LINE_LEN,stdin)!=NULL)
        {
            if(*buf != '\0')
                buf[strlen(buf)-1]='\0';
            printf("->:");
            continue;
        }
        
    switch (pid = fork()){
        case -1:
            perror("fork failed");
            break;
        case 0:
            execlp(buf,buf,NULL);
            perror("cannot execlp");
            break;
        default :
            if(waitpid(pid,&status,0)==-1)
                perror("waitpid");
                break;
    }
    printf("->:");
    
    if(errno != EINTR)
        break;
    errno = 0;
    }
    return (0);
}

void
doinput()
{
	char ibuf[BUFSIZ];
	int cc;

	(void) fclose(fscript);
	sigset(SIGWINCH, sigwinch);

	while ((cc = read(0, ibuf, BUFSIZ)) != 0) {
		if (cc == -1) {
			if (errno == EINTR) {   /* SIGWINCH probably */
				continue;
			} else {
				break;
			}
		}
		(void) write(master, ibuf, cc);
	}
	done();
}

int main()
{
	sigset_t mask;
	sigemptyset(&mask);

	sigprocmask(SIG_SETMASK, &mask, NULL);

	if (sigset(SIGCHLD, myhandler) == SIG_ERR) {
                perror("Unexpected error while using sigset()");
               	return PTS_UNRESOLVED;
        }

	raise(SIGCHLD);
	sigprocmask(SIG_SETMASK, NULL, &mask);

	if (is_empty(&mask) != 1) {
		printf("Test FAILED: signal mask should be empty\n");
		return PTS_FAIL;
	}
	return PTS_PASS;
} 

static int
returnTest2 (void)
{
  sighandler_t prev;

  printf ("\n===== TEST 2 =====\n");

  printf ("About to use sigset() to set SIG_HOLD\n");
  prev = sigset (TEST_SIG, SIG_HOLD);
  if (prev == SIG_ERR)
    error (1, errno, "sigset");

  printf ("Previous disposition: ");
  printDisposition (prev);
  printf (" (should be SIG_DFL)\n");
  if (prev != SIG_DFL)
    {
      printf("TEST FAILED!!!\n");
      return 1;
    }
  return 0;
} /* returnTest2 */

static void
ktrsigaction(const struct sigaction *sa)
{
	/*
	 * note: ktrstruct() has already verified that sa points to a
	 * buffer exactly sizeof(struct sigaction) bytes long.
	 */
	printf("struct sigaction { ");
	if (sa->sa_handler == SIG_DFL)
		printf("handler=SIG_DFL");
	else if (sa->sa_handler == SIG_IGN)
		printf("handler=SIG_IGN");
	else if (sa->sa_flags & SA_SIGINFO)
		printf("sigaction=%p", (void *)sa->sa_sigaction);
	else
		printf("handler=%p", (void *)sa->sa_handler);
	printf(", mask=");
	sigset(sa->sa_mask);
	printf(", flags=");
	sigactionflagname(sa->sa_flags);
	printf(" }\n");
}

void BSP_Reset(void)
{
    pid_t pid = getpid();
    char cmdline_file[200];
    char cmdline[1024];
    int cfd, r;
    snprintf(cmdline_file, 200, CMDLINE_FILE, pid);
    cfd = open(cmdline_file, O_RDONLY);
    if (cfd < 0) {
        printf("Reboot failed: Cannot access %s: %s\n", cmdline_file, strerror(errno));
        exit(2);
    }
    r = read(cfd, cmdline, 1024);

    if (r < 0) {
        printf("Reboot failed: Cannot read cmdline from proc file\n");
        exit(2);
    }
    printf("############ Rebooting...\n\n\n");
    sigset(SIGALRM, SIG_IGN);
    execl(cmdline, cmdline, NULL);
}

static void init(void)
{
	int fd;
	char wdbuf[MAXPATHLEN];

	parent_pid = getpid();
	tst_tmpdir();

	/*
	 * Make a filename for the test.
	 */
	if (!filename[0])
		sprintf(filename, "%s/ftest08.%d", getcwd(wdbuf, MAXPATHLEN),
			getpid());

	fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0666);

	if (fd < 0) {
		tst_resm(TBROK, "Error %d creating file %s", errno, filename);
		tst_exit();
	}

	close(fd);

	/*
	 * Default values for run conditions.
	 */
	iterations = 10;
	nchild = 5;
	csize = K_2;		/* should run with 1, 2, and 4 K sizes */
	max_size = K_1 * K_1;
	misc_intvl = 10;

	if (sigset(SIGTERM, term) == SIG_ERR) {
		tst_brkm(TBROK | TERRNO, NULL, "first sigset failed");
	}

}

int main(void)
{
	sigset_t pendingset;
	struct sigaction act;
	act.sa_handler = myhandler;
	act.sa_flags = 0;
	sigemptyset(&act.sa_mask);
	int rc;

	rc = sigaction(SIGCHLD, &act, 0);
	if (rc) {
		ERR_MSG("sigaction()", rc);
		return PTS_UNRESOLVED;
	}

	if (sigset(SIGCHLD, SIG_HOLD) == SIG_ERR) {
		perror("Unexpected error while using sigset()");
		return PTS_UNRESOLVED;
	}

	raise(SIGCHLD);

	rc = sigpending(&pendingset);
	if (rc) {
		ERR_MSG("sigpending()", rc);
		return PTS_UNRESOLVED;
	}

	if (sigismember(&pendingset, SIGCHLD) != 1) {
		printf("Test FAILED: Signal SIGCHLD wasn't hold.\n");
		return PTS_FAIL;
	}

	printf("Test PASSED\n");
	return PTS_PASS;
}

int					/* O - Exit status */
main(int  argc,				/* I - Number of command-line arguments (6 or 7) */
     char *argv[])			/* I - Command-line arguments */
{
  const char	*device_uri;		/* Device URI */
  char		scheme[255],		/* Scheme in URI */
		hostname[1024],		/* Hostname */
		username[255],		/* Username info (not used) */
		resource[1024],		/* Resource info (not used) */
		*options,		/* Pointer to options */
		*name,			/* Name of option */
		*value,			/* Value of option */
		sep;			/* Option separator */
  int		print_fd;		/* Print file */
  int		copies;			/* Number of copies to print */
  time_t	start_time;		/* Time of first connect */
#ifdef __APPLE__
  time_t	current_time,		/* Current time */
		wait_time;		/* Time to wait before shutting down socket */
#endif /* __APPLE__ */
  int		contimeout;		/* Connection timeout */
  int		waiteof;		/* Wait for end-of-file? */
  int		port;			/* Port number */
  char		portname[255];		/* Port name */
  int		delay;			/* Delay for retries... */
  int		device_fd;		/* AppSocket */
  int		error;			/* Error code (if any) */
  http_addrlist_t *addrlist,		/* Address list */
		*addr;			/* Connected address */
  char		addrname[256];		/* Address name */
  int		snmp_fd,		/* SNMP socket */
		start_count,		/* Page count via SNMP at start */
		page_count,		/* Page count via SNMP */
		have_supplies;		/* Printer supports supply levels? */
  ssize_t	bytes = 0,		/* Initial bytes read */
		tbytes;			/* Total number of bytes written */
  char		buffer[1024];		/* Initial print buffer */
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  struct sigaction action;		/* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */


 /*
  * Make sure status messages are not buffered...
  */

  setbuf(stderr, NULL);

 /*
  * Ignore SIGPIPE signals...
  */

#ifdef HAVE_SIGSET
  sigset(SIGPIPE, SIG_IGN);
#elif defined(HAVE_SIGACTION)
  memset(&action, 0, sizeof(action));
  action.sa_handler = SIG_IGN;
  sigaction(SIGPIPE, &action, NULL);
#else
  signal(SIGPIPE, SIG_IGN);
#endif /* HAVE_SIGSET */

 /*
  * Check command-line...
  */

  if (argc == 1)
  {
    printf("network socket \"Unknown\" \"%s\"\n",
           _cupsLangString(cupsLangDefault(), _("AppSocket/HP JetDirect")));
    return (CUPS_BACKEND_OK);
  }
  else if (argc < 6 || argc > 7)
  {
    _cupsLangPrintf(stderr,
                    _("Usage: %s job-id user title copies options [file]"),
                    argv[0]);
    return (CUPS_BACKEND_FAILED);
  }

 /*
  * If we have 7 arguments, print the file named on the command-line.
  * Otherwise, send stdin instead...
  */

  if (argc == 6)
  {
    print_fd = 0;
    copies   = 1;
  }
  else
  {
   /*
    * Try to open the print file...
    */

    if ((print_fd = open(argv[6], O_RDONLY)) < 0)
    {
      _cupsLangPrintError("ERROR", _("Unable to open print file"));
      return (CUPS_BACKEND_FAILED);
//.........这里部分代码省略.........