void run() {
pid_t pid;
int i;
struct sembuf inc[2] = {{0, a_size/2, 0}, {1, a_size/2, 0}};
x_semop(semid, &inc[0], 1);
for(i = 0; i < a_size/2; i++) {
pid = x_fork();
if(ISCHILD(pid)) {
run_comparator(i, cascades);
exit(0);
}
}
i = 0;
while(13) {
x_semop(semid, &swait[i%2], 1);
x_semop(semid, &inc[(i + 1)%2], 1);
i++;
if(cascades == i) {
break;
}
}
}
int daemon_init(const char *pname, int facility)
{
int i;
pid_t pid;
if ( (pid = x_fork()) < 0)
return (-1);
else if (pid)
_exit(0); /* parent terminates */
/* child 1 continues... */
if (setsid() < 0) /* become session leader */
return (-1);
Signal(SIGHUP, SIG_IGN);
if ( (pid = x_fork()) < 0)
return (-1);
else if (pid)
_exit(0); /* child 1 terminates */
/* child 2 continues... */
daemon_proc = 1; /* for err_XXX() functions */
chdir("/"); /* change working directory */
/* close off file descriptors */
for (i = 0; i < MAXFD; i++)
close(i);
/* redirect stdin , stdout , and stderr to .dev/null */
open("/dev/null", O_RDONLY);
open("/dev/null", O_RDWR);
open("/dev/null", O_RDWR);
openlog(pname, LOG_PID, facility);
return (0); /* sucess */
}
void run_test() {
int n;
pid_t pid;
n = NUM_PROC;
while(n-- > 0) {
pid = x_fork();
if(IS_CHILD(pid)) {
// do something;
test_routine();
exit(0);
}
}
n = NUM_PROC;
while(n-- > 0) {
pid = x_wait(NULL);
//printf("Done: %d\n", pid);
}
}
int main(void) {
int in[2];
int out[2];
pid_t pid;
printf("type 'quit' for exit\n\n");
x_pipe(in);
x_pipe(out);
pid = x_fork();
if(IS_CHILD(pid)) {
x_dup2(in[READ], STDIN_FD);
x_dup2(out[WRITE], STDOUT_FD);
x_close(in[READ]);
x_close(in[WRITE]);
x_close(out[READ]);
x_close(out[WRITE]);
execl("/usr/bin/bc", "runbc", NULL);
perror("execl");
exit(1);
} else if(IS_PARENT(pid)) {
char buf[BUFSIZE + 1];
fd_set rfds;
int count;
int flag = 1;
x_close(in[READ]);
x_close(out[WRITE]);
while(13) {
FD_ZERO(&rfds);
FD_SET(STDIN_FD, &rfds);
FD_SET(out[READ], &rfds);
count = 0;
x_select(out[READ] + 1, &rfds, NULL, NULL, NULL);
if(FD_ISSET(out[READ], &rfds)) {
// read messages from BC
count = x_read(out[READ], buf, BUFSIZE);
if(count) {
x_write(STDOUT_FD, buf, count);
} else {
break;
}
}
if(FD_ISSET(STDIN_FD, &rfds) && flag) {
// send commands to BC
count = x_read(STDIN_FD, buf, BUFSIZE);
if(count) {
x_write(in[WRITE], buf, count);
} else {
x_write(in[WRITE], "quit\n", 6);
flag = 0;
}
}
}
x_waitpid(pid, NULL, 0);
x_close(in[WRITE]);
x_close(out[READ]);
}
return 0;
}
