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##accept4 在accept时，直接设置SOCK_NONBLOCK/SOCK_CLOEXEC

int accept4(int sockfd, struct sockaddr *addr,
	           socklen_t *addrlen, int flags);

##socket int socket(int domain, int type, int protocol);

Since Linux 2.6.27, the type argument serves a second purpose: in
       addition to specifying a socket type, it may include the bitwise OR
       of any of the following values, to modify the behavior of socket():

       SOCK_NONBLOCK   Set the O_NONBLOCK file status flag on the new open
	               file description.  Using this flag saves extra calls
	               to fcntl(2) to achieve the same result.

       SOCK_CLOEXEC    Set the close-on-exec (FD_CLOEXEC) flag on the new
	               file descriptor.  See the description of the
	               O_CLOEXEC flag in open(2) for reasons why this may be
	               useful.

##open int open(const char *pathname, int flags);

int open(const char *pathname, int flags, mode_t mode);

O_CLOEXEC (since Linux 2.6.23)
	      Enable the close-on-exec flag for the new file descriptor.
	      Specifying this flag permits a program to avoid additional
	      fcntl(2) F_SETFD operations to set the FD_CLOEXEC flag.

##pipe2 int pipe2(int pipefd[2], int flags);

O_CLOEXEC
	      Set the close-on-exec (FD_CLOEXEC) flag on the two new file
	      descriptors.  See the description of the same flag in open(2)
	      for reasons why this may be useful.
O_NONBLOCK
	      Set the O_NONBLOCK file status flag on the two new open file
	      descriptions.  Using this flag saves extra calls to fcntl(2)
	      to achieve the same result.

##socketpair int socketpair(int domain, int type, int protocol, int sv[2]);

Since Linux 2.6.27, socketpair() supports the SOCK_NONBLOCK and
       SOCK_CLOEXEC flags described in socket(2).

##pthread_tryjoin_np int pthread_tryjoin_np(pthread_t thread, void **retval);

int pthread_timedjoin_np(pthread_t thread, void **retval, const struct timespec *abstime);

The pthread_tryjoin_np() function performs a nonblocking join with
the thread thread, returning the exit status of the thread in
*retval.  If thread has not yet terminated, then instead of blocking,
as is done by pthread_join(3), the call returns an error.

The pthread_timedjoin_np() function performs a join-with-timeout.  If
thread has not yet terminated, then the call blocks until a maximum
time, specified in abstime.  If the timeout expires before thread
terminates, the call returns an error.  The abstime argument is a
structure of the following form, specifying an absolute time measured
since the Epoch (see time(2)):

   struct timespec {
       time_t tv_sec;     /* seconds */
       long   tv_nsec;    /* nanoseconds */
   };