下面是error相关的返回值
1#ifndef _ASM_GENERIC_ERRNO_BASE_H
2#define _ASM_GENERIC_ERRNO_BASE_H
3
4#define EPERM 1 /* Operation not permitted */操作禁止
5#define ENOENT 2 /* No such file or directory */文件或者目录不存在
6#define ESRCH 3 /* No such process */相应的进程不存在
7#define EINTR 4 /* Interrupt
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