Attachment 145522 Details for Bug 180970 – updated exec.h

[patch] updated exec.h

sys_sys_exec.h-WB.diff (text/plain), 1.60 KB, created by Warren Block on 2014-08-08 14:09:21 UTC

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Creator: Warren Block

Created: 2014-08-08 14:09:21 UTC

Size: 1.60 KB

patch

obsolete

>Index: sys/sys/exec.h
>===================================================================
>--- sys/sys/exec.h	(revision 269684)
>+++ sys/sys/exec.h	(working copy)
>@@ -39,12 +39,17 @@
> #define _SYS_EXEC_H_
> 
> /*
>- * The following structure is found at the top of the user stack of each
>- * user process. The ps program uses it to locate argv and environment
>- * strings. Programs that wish ps to display other information may modify
>- * it; normally ps_argvstr points to the argv vector, and ps_nargvstr
>- * is the same as the program's argc. The fields ps_envstr and ps_nenvstr
>- * are the equivalent for the environment.
>+ * In the past, the following structure, found at the top of the user stack
>+ * of each user process, was used by the kernel to locate environment and
>+ * long argv strings.  Normally ps_argvstr points to the argv vector, and
>+ * ps_nargvstr is the same as the program's argc. The fields ps_envstr and
>+ * ps_nenvstr are the equivalent for the environment.
>+ *
>+ * Modern programs should now use setproctitle(3) to change ps output.
>+ * setproctitle() always informs the kernel with sysctl and sets the
>+ * pointers in ps_strings.  The kern.proc.args sysctl first tries p_args.
>+ * If p_args is NULL, it then falls back to reading ps_strings and following
>+ * the pointers.
>  */
> struct ps_strings {
> 	char	**ps_argvstr;	/* first of 0 or more argument strings */
>@@ -55,6 +60,7 @@
> 
> /*
>  * Address of ps_strings structure (in user space).
>+ * Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant.
>  */
> #define	PS_STRINGS	(USRSTACK - sizeof(struct ps_strings))
> #define SPARE_USRSPACE	4096

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