fusl/src/network/socketpair.c

#include <sys/socket.h>
#include <fcntl.h>
#include <errno.h>
#include "syscall.h"

int socketpair(int domain, int type, int protocol, int fd[2]) {
  int r = syscall(SYS_socketpair, domain, type, protocol, fd, 0, 0);
  if (r < 0 && (errno == EINVAL || errno == EPROTONOSUPPORT) &&
      (type & (SOCK_CLOEXEC | SOCK_NONBLOCK))) {
    r = syscall(SYS_socketpair, domain, type & ~(SOCK_CLOEXEC | SOCK_NONBLOCK),
                protocol, fd, 0, 0);
    if (r < 0)
      return r;
    if (type & SOCK_CLOEXEC) {
      __syscall(SYS_fcntl, fd[0], F_SETFD, FD_CLOEXEC);
      __syscall(SYS_fcntl, fd[1], F_SETFD, FD_CLOEXEC);
    }
    if (type & SOCK_NONBLOCK) {
      __syscall(SYS_fcntl, fd[0], F_SETFL, O_NONBLOCK);
      __syscall(SYS_fcntl, fd[1], F_SETFL, O_NONBLOCK);
    }
  }
  return r;
}