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m-seven

Member

Registered: 2017-11-15

Posts: 3

what does KERN_SOH mean？

Hi all ，there is  the code of the Linux kernel.h ：

#define KERN_SOH    "\001"      /* ASCII Start Of Header */
#define KERN_SOH_ASCII  '\001'

#define KERN_EMERG  KERN_SOH "0"    /* system is unusable */
#define KERN_ALERT  KERN_SOH "1"    /* action must be taken immediately */
#define KERN_CRIT   KERN_SOH "2"    /* critical conditions */
#define KERN_ERR    KERN_SOH "3"    /* error conditions */
#define KERN_WARNING    KERN_SOH "4"    /* warning conditions */
#define KERN_NOTICE KERN_SOH "5"    /* normal but significant condition */
#define KERN_INFO   KERN_SOH "6"    /* informational */
#define KERN_DEBUG  KERN_SOH "7"    /* debug-level messages */

#define KERN_DEFAULT    KERN_SOH "d"    /* the default kernel loglevel */

why does it need to define KERN_SOH？

ｗｈａｔ ｄｏｅｓ ＫＥＲＮ＿ＳＯＨ ｍｅａｎ？

ｗｈｙ ｎｏｔ ｊｕｓｔ ｄｅｆｉｎｅ ＫＥＲＮ＿ＥＭＥＲＧ ，ＫＥＲＮ＿ＡＬＥＲＴ ａｓ ｓｉｍｐｌｅ ａｓ ０，１，２～～～

x33a

Forum Fellow

Registered: 2009-08-15

Posts: 4,587

Re: what does KERN_SOH mean？

I am not sure this question belongs to our forums, you should take it upstream. In any case, I'll move it for the time being.

Moving to GNU/Linux discussion.

loqs

Member

Registered: 2014-03-06

Posts: 18,206

Re: what does KERN_SOH mean？

Did you try git blame on include/linux/kern_levels.h line 5 which is

#define KERN_SOH	"\001"	/* ASCII Start Of Header */

https://git.kernel.org/pub/scm/linux/ke … 3236200112