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Expose kernel-only errno values if _WANT_KERNEL_ERRNO is defined.

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The kernel uses a few negative errno values for internal conditions
such as requesting a system call restart.  Normally these errno values
are not exposed to userland.  However, kdump needs access to these
values as some of then can be present in a ktrace system call return
record.  Previously kdump was defining _KERNEL to gain access to ehse
values, but was then having to manually declare 'errno' (and doing it
incorrectly).  Now, kdump uses _WANT_KERNEL_ERRNO instead of _KERNEL
and uses the system-provided declaration of errno.
This commit is contained in:
John Baldwin 2016-10-01 22:08:07 +00:00
parent 8dec694290
commit 406d2926f2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=306564
2 changed files with 2 additions and 5 deletions
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2
sys/sys/errno.h
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@ -184,7 +184,7 @@ __END_DECLS
#define ELAST 96 /* Must be equal largest errno */
#endif /* _POSIX_SOURCE */
#ifdef _KERNEL
#if defined(_KERNEL) || defined(_WANT_KERNEL_ERRNO)
/* pseudo-errors returned inside kernel to modify return to process */
#define ERESTART (-1) /* restart syscall */
#define EJUSTRETURN (-2) /* don't modify regs, just return */

5
usr.bin/kdump/kdump.c
View File

@ -41,10 +41,7 @@ static char sccsid[] = "@(#)kdump.c 8.1 (Berkeley) 6/6/93";
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define _KERNEL
extern int errno;
#include <sys/errno.h>
#undef _KERNEL
#define _WANT_KERNEL_ERRNO
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/errno.h>