Date: Sun, 12 Aug 2001 16:23:56 +0100 (BST) From: Joe Karthauser <joe@tao.org.uk> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/29682: /proc/pid/status broken for irqN processes. Message-ID: <20010812152356.5D3C337C@tao.org.uk>
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>Number: 29682
>Category: kern
>Synopsis: /proc/pid/status broken for irqN processes.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Aug 13 14:00:05 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Joe Karthauser
>Release: FreeBSD 5.0-CURRENT i386
>Organization:
Tao Research
>Environment:
System: FreeBSD genius.tao.org.uk 5.0-CURRENT FreeBSD 5.0-CURRENT #12: Sun Aug 12 14:13:44 BST 2001 root@:/usr/obj/usr/src/sys/GENIUS i386
>Description:
Processes that use procfs, like wmtop, are broken under -current.
This is because the /proc/pid/status file is a space separated
list of entries, but irq threads in -current contain spaces in
their names. This makes it impossible to parse the status file
correctly.
genius# cat /proc/15/status
swi5: task queue 15 0 0 0 -1,-1 noflags 997626444,23 0,0 0,0 nochan 0 0
0,0 -
The field 'swi5: task queue' should is a single field, but
contains spaces.
>How-To-Repeat:
>Fix:
I've fixed it locally by replacing spaces with underscores
whilst constructing the status file in
sys/fs/procfs/procfs_status.c.
The following patch illustrates the idea, but please note that
it's a hack[tm], not a recommendation:
Index: procfs_status.c
===================================================================
RCS file: /home/ncvs/src/sys/fs/procfs/procfs_status.c,v
retrieving revision 1.32
diff -u -r1.32 procfs_status.c
--- procfs_status.c 2001/07/05 17:10:43 1.32
+++ procfs_status.c 2001/08/12 15:03:10
@@ -58,6 +58,8 @@
#include <fs/procfs/procfs.h>
+void jbcopy(const char *src0, char *dst0, register size_t length);
+
#define DOCHECK() do { if (ps >= psbuf+sizeof(psbuf)) goto bailout; } while (0)
int
procfs_dostatus(curp, p, pfs, uio)
@@ -95,7 +97,7 @@
("Too short buffer for new MAXCOMLEN"));
ps = psbuf;
- bcopy(p->p_comm, ps, MAXCOMLEN);
+ jbcopy(p->p_comm, ps, MAXCOMLEN);
ps[MAXCOMLEN] = '\0';
ps += strlen(ps);
DOCHECK();
@@ -188,6 +190,34 @@
bailout:
return (ENOMEM);
+}
+
+
+
+void
+jbcopy(src0, dst0, length)
+ const char *src0;
+ char *dst0;
+ register size_t length;
+{
+ int i;
+
+ for (i = 0 ; i < length ; ++i) {
+ *dst0 = *src0;
+ if (*dst0 == ' ') {
+ *dst0 = '_';
+ }
+ if (!*src0) {
+ break;
+ }
+
+ ++dst0;
+ ++src0;
+ }
+
+ if (i == length) {
+ *dst0 = '\0';
+ }
}
int
>Release-Note:
>Audit-Trail:
>Unformatted:
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