github.com/afumu/libc@v0.0.6/musl/src/network/socketpair.c (about)

     1  #include <sys/socket.h>
     2  #include <fcntl.h>
     3  #include <errno.h>
     4  #include "syscall.h"
     5  
     6  int socketpair(int domain, int type, int protocol, int fd[2])
     7  {
     8  	int r = socketcall(socketpair, domain, type, protocol, fd, 0, 0);
     9  	if (r<0 && (errno==EINVAL || errno==EPROTONOSUPPORT)
    10  	    && (type&(SOCK_CLOEXEC|SOCK_NONBLOCK))) {
    11  		r = socketcall(socketpair, domain,
    12  			type & ~(SOCK_CLOEXEC|SOCK_NONBLOCK),
    13  			protocol, fd, 0, 0);
    14  		if (r < 0) return r;
    15  		if (type & SOCK_CLOEXEC) {
    16  			__syscall(SYS_fcntl, fd[0], F_SETFD, FD_CLOEXEC);
    17  			__syscall(SYS_fcntl, fd[1], F_SETFD, FD_CLOEXEC);
    18  		}
    19  		if (type & SOCK_NONBLOCK) {
    20  			__syscall(SYS_fcntl, fd[0], F_SETFL, O_NONBLOCK);
    21  			__syscall(SYS_fcntl, fd[1], F_SETFL, O_NONBLOCK);
    22  		}
    23  	}
    24  	return r;
    25  }