Date: Tue, 8 Oct 2002 12:31:47 +0200 (CEST) From: Slaven Rezic <eserte@vran.herceg.de> To: FreeBSD-gnats-submit@FreeBSD.org Subject: bin/43819: changed truss output for utrace calls Message-ID: <200210081031.g98AVlSS006536@vran.herceg.de>
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>Number: 43819
>Category: bin
>Synopsis: changed truss output for utrace calls
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 08 03:40:03 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Slaven Rezic
>Release: FreeBSD 4.6-STABLE i386
>Organization:
www.rezic.de
>Environment:
System: FreeBSD vran.herceg.de 4.6-STABLE FreeBSD 4.6-STABLE #15: Sat Jul 27 09:32:28 CEST 2002 root@vran.herceg.de:/usr/local/src/FreeBSD-4/src/sys/compile/VRAN i386
>Description:
FreeBSD's malloc has a feature to emit utrace syscalls for
debugging when MALLOC_OPTIONS contains the "U" character.
Using ktrace, one can find the following entries with kdump:
4059 perl5.8.0 CALL utrace(0xbfbff2a4,0xc)
4059 perl5.8.0 USER 12 00 00 00 00 01 00 00 00 30 90 11 08
4059 perl5.8.0 RET utrace 0
These lines can easily be converted into malloc/free/realloc
calls.
However, with truss the output looks as follows:
utrace(0xbfbff2a4,0xc) = 0 (0x0)
That is, the first argument is only a pointer to the utrace
buffer. I propose to change truss to dump the contents
of the buffer instead:
utrace(0x000000005000000000b01108) = 0 (0x0)
The second parameter (the size of the buffer) has gone,
because it can be determined by the length of the buffer
string.
>How-To-Repeat:
>Fix:
This patch should be applied in the /usr/src/usr.bin/truss
directory:
--- syscalls.c.orig Tue Oct 8 11:21:24 2002
+++ syscalls.c Tue Oct 8 11:53:36 2002
@@ -101,6 +101,8 @@ struct syscall syscalls[] = {
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "getsockname", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
+ { "utrace", 1, 1,
+ { { Utrace, 0 } } },
{ 0, 0, 0, { { 0, 0 }}},
};
@@ -341,6 +343,23 @@ print_arg(int fd, struct syscall_args *s
}
}
break;
+ case Utrace:
+ {
+ int i, len;
+ unsigned char *p;
+ unsigned char *utrace_buffer;
+ len = args[sc->offset+1];
+ tmp = malloc(len*2+2+1);
+ utrace_buffer = malloc(len);
+ if (get_struct(fd, (void *)args[sc->offset], (void *)utrace_buffer,
+ len) == -1)
+ err(1, "get_struct %p", (void *)args[sc->offset]);
+ strcpy(tmp, "0x");
+ for(i = 0; i < len; i++) {
+ sprintf(tmp+2+i*2, "%02x", *(utrace_buffer+i));
+ }
+ free(utrace_buffer);
+ }
}
return tmp;
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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