d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add a way for the process to request cleanup of the kernel cache of

Browse Source 
the process arguments.  New arguments length zero causes the drop of
the pargs instead of allocation of useless zero-length buffer.

Submitted by:	Thomas Munro
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D16111
This commit is contained in:
Konstantin Belousov 2018-07-04 13:22:48 +00:00
parent b0af06052c
commit d6eff0832c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=335935
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
sys/kern/kern_proc.c
View File

@ -1988,11 +1988,20 @@ sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
if (req->newlen > ps_arg_cache_limit - sizeof(struct pargs))
return (ENOMEM);
newpa = pargs_alloc(req->newlen);
error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
if (error != 0) {
pargs_free(newpa);
return (error);
if (req->newlen == 0) {
/*
* Clear the argument pointer, so that we'll fetch arguments
* with proc_getargv() until further notice.
*/
newpa = NULL;
} else {
newpa = pargs_alloc(req->newlen);
error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
if (error != 0) {
pargs_free(newpa);
return (error);
}
}
PROC_LOCK(p);
pa = p->p_args;