Add a new "file" to procfs: "rlimit" which shows the resource limits for

the process.

PR:		11342
Submitted by:	Adrian Chadd adrian@freebsd.org
Reviewed by:	phk

1 files changed, 175 insertions, 0 deletions

diff --git a/sys/fs/procfs/procfs_rlimit.c b/sys/fs/procfs/procfs_rlimit.c
new file mode 100644
index 0000000..b211d0b
--- /dev/null
+++ b/sys/fs/procfs/procfs_rlimit.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 1999 Adrian Chadd
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)procfs_status.c	8.4 (Berkeley) 6/15/94
+ *
+ *	$Id: procfs_status.c,v 1.12 1999/01/05 03:53:06 peter Exp $
+ */
+
+/*
+ * To get resource.h to include our rlimit_ident[] array of rlimit identifiers
+ */
+
+#define _RLIMIT_IDENT
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/tty.h>
+#include <sys/resourcevar.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <miscfs/procfs/procfs.h>
+
+
+/*
+ * This converts a quad_t to a string, stored in fin
+ * It is here because there doesn't exist a quad_t entry in the kernel
+ * printf() library.
+ */
+
+static void quadtostring (char *fin, quad_t num)
+{
+	char str[128];
+	char *cp;
+	int i, n;
+
+	cp = str;
+	i = 0;
+  
+	/*
+	 * Create the number string.
+	 * The string will be in reverse from the original number.
+	 */
+
+	while (num) {
+		*(cp++) = (num % 10) + '0';
+		num /= 10;
+		i++;
+	}
+
+	/* Null terminate */
+	*cp = '\0';
+
+	/*
+	 * Now, swap the order 
+	 */ 
+
+	for (n = 0; n < i; n++) {
+  		fin[n] = str[(i-1)-n];
+	}
+
+	/* Null terminate */
+	fin[n] = '\0';
+
+	return;
+}
+
+
+
+int
+procfs_dorlimit(curp, p, pfs, uio)
+	struct proc *curp;
+	struct proc *p;
+	struct pfsnode *pfs;
+	struct uio *uio;
+{
+	char *ps;
+	int i;
+	int xlen;
+	int error;
+	char psbuf[512];		/* XXX - conservative */
+	char qstr[64];
+
+	if (uio->uio_rw != UIO_READ)
+		return (EOPNOTSUPP);
+
+
+	ps = psbuf;
+
+	for (i = 0; i < RLIM_NLIMITS; i++) {
+
+		/*
+		 * Add the rlimit ident
+		 */
+
+		ps += sprintf(ps, "%s ", rlimit_ident[i]);
+
+		/* 
+		 * Replace RLIM_INFINITY with -1 in the string
+		 */
+
+		/*
+		 * current limit
+		 */
+
+		if (p->p_rlimit[i].rlim_cur == RLIM_INFINITY) {
+			ps += sprintf(ps, "-1 ");
+		} else {
+			quadtostring(qstr, p->p_rlimit[i].rlim_cur);
+			ps += sprintf(ps, "%s ", qstr);
+		}
+
+		/*
+		 * maximum limit
+		 */
+
+		if (p->p_rlimit[i].rlim_max == RLIM_INFINITY) {
+			ps += sprintf(ps, "-1\n");
+		} else {
+			quadtostring(qstr, p->p_rlimit[i].rlim_max);
+			ps += sprintf(ps, "%s\n", qstr);
+		}
+	}
+
+	/*
+	 * This logic is rather tasty - but its from procfs_status.c, so
+	 * I guess I'll use it here.
+	 */
+
+	xlen = ps - psbuf;
+	xlen -= uio->uio_offset;
+	ps = psbuf + uio->uio_offset;
+	xlen = imin(xlen, uio->uio_resid);
+	if (xlen <= 0)
+		error = 0;
+	else
+		error = uiomove(ps, xlen, uio);
+
+	return (error);
+}
+