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Add sysctl to get process resource limits.

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Reviewed by:	kib
MFC after:	2 weeks
This commit is contained in:
Mikolaj Golub 2011-11-24 20:43:37 +00:00
parent 016c7a485f
commit 9e7d058351
2 changed files with 47 additions and 0 deletions
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46
sys/kern/kern_proc.c
View File

@ -54,6 +54,7 @@ __FBSDID("$FreeBSD$");
#include <sys/proc.h>
#include <sys/ptrace.h>
#include <sys/refcount.h>
#include <sys/resourcevar.h>
#include <sys/sbuf.h>
#include <sys/sysent.h>
#include <sys/sched.h>
@ -2389,6 +2390,48 @@ sysctl_kern_proc_groups(SYSCTL_HANDLER_ARGS)
return (error);
}
/*
* This sysctl allows a process to retrieve the resource limits for
* another process.
*/
static int
sysctl_kern_proc_rlimit(SYSCTL_HANDLER_ARGS)
{
int *name = (int*) arg1;
u_int namelen = arg2;
struct plimit *limp;
struct proc *p;
int error = 0;
if (namelen != 1)
return (EINVAL);
p = pfind((pid_t)name[0]);
if (p == NULL)
return (ESRCH);
if ((error = p_cansee(curthread, p)) != 0) {
PROC_UNLOCK(p);
return (error);
}
/*
* Check the request size. We alow sizes smaller rlimit array for
* backward binary compatibility: the number of resource limits may
* grow.
*/
if (sizeof(limp->pl_rlimit) < req->oldlen) {
PROC_UNLOCK(p);
return (EINVAL);
}
limp = lim_hold(p->p_limit);
PROC_UNLOCK(p);
error = SYSCTL_OUT(req, limp->pl_rlimit, req->oldlen);
lim_free(limp);
return (error);
}
SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT|
@ -2484,3 +2527,6 @@ static SYSCTL_NODE(_kern_proc, KERN_PROC_KSTACK, kstack, CTLFLAG_RD |
static SYSCTL_NODE(_kern_proc, KERN_PROC_GROUPS, groups, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_groups, "Process groups");
static SYSCTL_NODE(_kern_proc, KERN_PROC_RLIMIT, rlimit, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_rlimit, "Process resource limits");

1
sys/sys/sysctl.h
View File

@ -561,6 +561,7 @@ SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a; unsigned long long *b; );
#define KERN_PROC_GROUPS 34 /* process groups */
#define KERN_PROC_ENV 35 /* get environment */
#define KERN_PROC_AUXV 36 /* get ELF auxiliary vector */
#define KERN_PROC_RLIMIT 37 /* process resource limits */
/*
* KERN_IPC identifiers