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<span style="font-family:Arial, Helvetica, simsun, u5b8bu4f53;"><span style="line-height:25px;">查看错误代码errno是调试程序的一个重要方法。当linuc C api函数发生异常时,一般会将errno变量(需include errno.h)赋一个整数值,不同的值表示不同的含义,可以通过查看该值推测出错的原因。在实际编程中用这一招解决了不少原本看来莫名其妙的问题。比较麻烦的是每次都要去linux源代码里面查找错误代码的含义，现在把它贴出来，以后需要查时就来这里看了。</span></span></div>
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<span style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;">1-34号错误号是在内核源码的include/asm-generic/errno-base.h定义</span><br style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"><br style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"><br style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"><span style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;">35-132则是在include/asm-generic/errno.h中定义</span><br style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"><br style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"><br style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"><span style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;">剩下还有一些更大的错误号是留给内核级别的，如系统调用等，</span><span style="line-height:26px;color:rgb(51,51,51);font-family:Arial;font-size:12px;">用户程序一般是看不见的这些号的，</span><span style="line-height:26px;color:rgb(51,51,51);font-family:Arial;font-size:12px;">Ubuntu9.10中/usr/src/linux-headers-2.6.31-21-generic/include/linux/errno.h<br></span><span style="color:rgb(70,70,70);font-family:simsun;font-size:14px;line-height:21px;"></span>
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<div><span style="color:#333333;"><span style="line-height:26px;">#ifndef _ASM_GENERIC_ERRNO_BASE_H</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define _ASM_GENERIC_ERRNO_BASE_H</span></span></div>
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<div><span style="color:#333333;"><span style="line-height:26px;">#define EPERM 1 /＊ Operation not permitted ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ENOENT 2 /＊ No such file or directory ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ESRCH 3 /＊ No such process ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define EINTR 4 /＊ Interrupted system call ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define EIO 5 /＊ I/O error ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ENXIO 6 /＊ No such device or address ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define E2BIG 7 /＊ Argument list too long ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ENOEXEC 8 /＊ Exec format error ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define EBADF 9 /＊ Bad file number ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ECHILD 10 /＊ No child processes ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define EAGAIN 11 /＊ Try again ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ENOMEM 12 /＊ Out of memory ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define EACCES 13 /＊ Permission denied ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define EFAULT 14 /＊ Bad address ＊/</span></span></div>
<div><span style="color:#333333;"><span style="line-height:26px;">#define ENOTBLK 15 |
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