#define EPERM 1 /* Operation not permitted /
#define ENOENT 2 / No such file or directory /
#define ESRCH 3 / No such process /
#define EINTR 4 / Interrupted system call /
#define EIO 5 / I/O error /
#define ENXIO 6 / No such device or address /
#define E2BIG 7 / Argument list too long /
#define ENOEXEC 8 / Exec format error /
#define EBADF 9 / Bad file number /
#define ECHILD 10 / No child processes /
#define EAGAIN 11 / Try again /
#define ENOMEM 12 / Out of memory /
#define EACCES 13 / Permission denied /
#define EFAULT 14 / Bad address /
#define ENOTBLK 15 / Block device required */
-107表示通信不上
