int main(int argc, char ** argv) {
//初始化两个信号集，一个只有usr1，一个只有usr2
sigemptyset(&t_sigset_usr);
sigemptyset(&t_sigset_old);
sigemptyset(&t_sigset_zero);
sigaddset(&t_sigset_usr, SIGUSR1);
sigaddset(&t_sigset_usr, SIGUSR2);
//注册信号处理程序，
signal(SIGUSR1, do_sig_usr);
signal(SIGUSR2, do_sig_usr);
//父进程阻塞usr信号
sigprocmask(SIG_SETMASK, &t_sigset_usr, NULL );
pid_t child_pid;
//父进程fork一个子进程出来
child_pid = fork();
if (child_pid == 0) {
//子进程,从2开始写
num = 2;
//注册信号处理程序，
signal(SIGUSR1, do_sig_usr);
signal(SIGUSR2, do_sig_usr);
//子进程阻塞usr信号
sigprocmask(SIG_SETMASK, &t_sigset_usr, NULL );
//子进程准备完毕，通知父进程去写
tell_parent();
while (1) {
//始终等待父进程唤醒
wait_parent();
write_num_to_file();
tell_parent();
}
} else {
//父进程
while (1) {
//始终等待子进程唤醒
wait_child();
write_num_to_file();
tell_child(child_pid);
}
}
//子进程写入数据，并且告知父进程，然后投入睡眠，等待父进程唤醒
//父进程等待子进程
exit(0);
}
void
test_waitpid(void)
{
wait_badpid(-8, "wait for pid -8");
wait_badpid(-1, "wait for pid -1");
wait_badpid(0, "pid zero");
wait_badpid(NONEXIST_PID, "nonexistent pid");
wait_nullstatus();
wait_badstatus(INVAL_PTR, "wait with invalid pointer status");
wait_badstatus(KERN_PTR, "wait with kernel pointer status");
wait_unaligned();
wait_badflags();
wait_self();
wait_parent();
wait_siblings();
}
int main(int argc, char* argv[]) {
if (argc != 2) {
fprintf(stderr, "Usage: %s <filename>\n", argv[1]);
exit(1);
}
int fd;
fd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, FILE_MODE);
write(fd, "abcdef", 6);
struct stat statbuf;
fstat(fd, &statbuf);
fchmod(fd, (statbuf.st_mode & ~S_IXGRP) | S_ISGID);
tell_wait();
pid_t pid;
pid = fork();
if (pid > 0) {
write_lock(fd, 0, SEEK_SET, 0);
tell_child(pid);
waitpid(pid, NULL, 0);
} else {
wait_parent();
set_fl(fd, O_NONBLOCK);
if (read_lock(fd, 0, SEEK_SET, 0) != -1)
err_sys("child: read_lock successed");
printf("read_lock of already-locked region returns %d\n", errno);
lseek(fd, 0, SEEK_SET);
char buf[5];
if (read(fd, buf, 2) < 0)
err_ret("read failed (mandatory locking works)");
else
printf("read OK (no mandatory locking), buf = %2.2s\n", buf);
}
}
int child_process()
{
int shm_id;
void* shm_ptr = NULL;
if(-1 == wait_parent()) {
printf("[C]fail to wait_parent\n");
return -1;
}
shm_id = shmget(SHM_KEY, SHM_SIZE, SHM_MODE);
if(-1 == shm_id) {
printf("[C]Fail to open shm, errno: %d, errmsg: %s\n", errno, strerror(errno));
return -1;
}
shm_ptr = shmat(shm_id, 0, 0);
if((void*)-1 == shm_ptr) {
printf("[C]Fail to attach to shm, errno: %d, errmsg: %s\n", errno, strerror(errno));
return -1;
}
char buf[1024] = {0};
memcpy((void*)buf, shm_ptr, strlen(shm_ptr));
printf("[C]Shm contents: %s\n", buf);
shmdt(shm_ptr);
if(-1 == tell_parent()) {
printf("[C]Fail to tell_parent\n");
return -1;
}
return 0;
}
void
test_waitpid(void)
{
int ntests = 0, lost_points = 0;
int result;
ntests++;
result = wait_badpid(-8, "wait for pid -8");
handle_result(result, &lost_points);
ntests++;
result = wait_badpid(-1, "wait for pid -1");
handle_result(result, &lost_points);
ntests++;
result = wait_badpid(0, "pid zero");
handle_result(result, &lost_points);
ntests++;
result = wait_badpid(NONEXIST_PID, "nonexistent pid");
handle_result(result, &lost_points);
ntests++;
result = wait_nullstatus();
handle_result(result, &lost_points);
ntests++;
result = wait_badstatus(INVAL_PTR, "wait with invalid pointer status");
handle_result(result, &lost_points);
ntests++;
result = wait_badstatus(KERN_PTR, "wait with kernel pointer status");
handle_result(result, &lost_points);
ntests++;
result = wait_unaligned();
handle_result(result, &lost_points);
ntests++;
result = wait_badflags();
handle_result(result, &lost_points);
ntests++;
result = wait_self();
handle_result(result, &lost_points);
ntests++;
result = wait_parent();
handle_result(result, &lost_points);
ntests++;
result = wait_siblings();
handle_result(result, &lost_points);
if(!lost_points)
success(TEST161_SUCCESS, SECRET, "/testbin/badcall");
}
int csopen(char *name, int oflag)
{
pid_t pid;
int len;
char buf[10];
struct iovec iov[3];
static int fd[] = {-1, -1};
struct sockaddr_un addr;
socklen_t addr_len;
int new_fd = -1;
//init server address
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, SERVER);
addr_len = offsetof(struct sockaddr_un, sun_path)+strlen(addr.sun_path);
if (0 > new_fd)
{
tell_wait();
if (0 > (pid = fork()))
{
perror("fork");
return EXIT_FAILURE;
} else if (0 == pid)
{
//open socket and connect to server
if (-1 == (fd[1] = socket(AF_UNIX, SOCK_STREAM, 0)))
{
perror("socket child");
return EXIT_FAILURE;
}
wait_parent();
if (-1 == connect(fd[1], (struct sockaddr*)&addr, addr_len))
{
perror("connect");
return EXIT_FAILURE;
}
if (fd[1] != STDIN_FILENO && dup2(fd[1], STDIN_FILENO) != STDIN_FILENO)
{
perror("dup2 on stdin");
return EXIT_FAILURE;
}
if (fd[1] != STDOUT_FILENO && dup2(fd[1], STDOUT_FILENO) != STDOUT_FILENO)
{
perror("dup2 on stdin");
return EXIT_FAILURE;
}
if (0 > execl("bin/opend1", "opend1", (char*)0))
{
perror("execl");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
//create a server and accept connections on it
if (-1 == (fd[0] = socket(AF_UNIX, SOCK_STREAM, 0)))
{
perror("socket parent");
return EXIT_FAILURE;
}
if (-1 == unlink(SERVER))
{
perror("unlink");
return EXIT_FAILURE;
}
if (-1 == bind(fd[0], (struct sockaddr*)&addr, addr_len))
{
perror("bind");
return EXIT_FAILURE;
}
if (-1 == listen(fd[0], 3))
{
perror("listen");
return EXIT_FAILURE;
}
tell_child();
if (-1 == (new_fd = accept(fd[0], (struct sockaddr*)&addr, &addr_len)))
{
perror("accept");
return EXIT_FAILURE;
}
}
sprintf(buf, " %d", oflag);
iov[0].iov_base = CL_OPEN " ";//string concatenation
iov[0].iov_len = strlen(CL_OPEN)+1;
iov[1].iov_base = name;
iov[1].iov_len = strlen(name);
iov[2].iov_base = buf;
iov[2].iov_len = strlen(buf)+1;
len = iov[0].iov_len+iov[1].iov_len+iov[2].iov_len;
if (len != writev(new_fd, iov, 3))
{
perror("writev");
return EXIT_FAILURE;
}
return recv_fd(new_fd, write);
}