Author: trociny
Date: Thu Nov 24 20:43:37 2011
New Revision: 227955
URL: http://svn.freebsd.org/changeset/base/227955
Log:
Add sysctl to get process resource limits.
Reviewed by: kib
MFC after: 2 weeks
Modified:
head/sys/kern/kern_proc.c
head/sys/sys/sysctl.h
Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c Thu Nov 24 20:37:09 2011 (r227954)
+++ head/sys/kern/kern_proc.c Thu Nov 24 20:43:37 2011 (r227955)
@@ -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_A
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
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");
Modified: head/sys/sys/sysctl.h
==============================================================================
--- head/sys/sys/sysctl.h Thu Nov 24 20:37:09 2011 (r227954)
+++ head/sys/sys/sysctl.h Thu Nov 24 20:43:37 2011 (r227955)
@@ -561,6 +561,7 @@ SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a
#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
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