text
stringlengths 0
234
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#include <stdlib.h>
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#include <stdio.h>
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int
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main(int argc, char *argv[])
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{
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mtrace();
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for (int j = 0; j < 2; j++)
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malloc(100); /* never freed\-\-a memory leak */
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calloc(16, 16); /* never freed\-\-a memory leak */
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exit(exit_success);
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}
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.ee
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.in
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.pp
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when we run the program as follows, we see that
|
.br mtrace ()
|
diagnosed memory leaks at two different locations in the program:
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.pp
|
.in +4n
|
.ex
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.rb "$ " "cc \-g t_mtrace.c \-o t_mtrace"
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.rb "$ " "export malloc_trace=/tmp/t"
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.rb "$ " "./t_mtrace"
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.rb "$ " "mtrace ./t_mtrace $malloc_trace"
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memory not freed:
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-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
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address size caller
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0x084c9378 0x64 at /home/cecilia/t_mtrace.c:12
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0x084c93e0 0x64 at /home/cecilia/t_mtrace.c:12
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0x084c9448 0x100 at /home/cecilia/t_mtrace.c:16
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.ee
|
.in
|
.pp
|
the first two messages about unfreed memory correspond to the two
|
.br malloc (3)
|
calls inside the
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.i for
|
loop.
|
the final message corresponds to the call to
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.br calloc (3)
|
(which in turn calls
|
.br malloc (3)).
|
.sh see also
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.br mtrace (1),
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.br malloc (3),
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.br malloc_hook (3),
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.br mcheck (3)
|
.sh colophon
|
this page is part of release 5.13 of the linux
|
.i man-pages
|
project.
|
a description of the project,
|
information about reporting bugs,
|
and the latest version of this page,
|
can be found at
|
\%https://www.kernel.org/doc/man\-pages/.
|
.so man3/rpc.3
|
.\" copyright 1993 david metcalfe ([email protected])
|
.\" and copyright 2008, linux foundation, written by michael kerrisk
|
.\" <[email protected]>
|
.\"
|
.\" %%%license_start(verbatim)
|
.\" permission is granted to make and distribute verbatim copies of this
|
.\" manual provided the copyright notice and this permission notice are
|
.\" preserved on all copies.
|
.\"
|
.\" permission is granted to copy and distribute modified versions of this
|
.\" manual under the conditions for verbatim copying, provided that the
|
.\" entire resulting derived work is distributed under the terms of a
|
.\" permission notice identical to this one.
|
.\"
|
.\" since the linux kernel and libraries are constantly changing, this
|
.\" manual page may be incorrect or out-of-date. the author(s) assume no
|
.\" responsibility for errors or omissions, or for damages resulting from
|
.\" the use of the information contained herein. the author(s) may not
|
.\" have taken the same level of care in the production of this manual,
|
.\" which is licensed free of charge, as they might when working
|
.\" professionally.
|
.\"
|
.\" formatted or processed versions of this manual, if unaccompanied by
|
.\" the source, must acknowledge the copyright and authors of this work.
|
.\" %%%license_end
|
.\"
|
.\" references consulted:
|
.\" linux libc source code
|
.\" lewine's _posix programmer's guide_ (o'reilly & associates, 1991)
|
.\" 386bsd man pages
|
.\" modified 1993-07-24 by rik faith ([email protected])
|
.\" modified 2002-07-25 by walter harms
|
.\" ([email protected])
|
.\"
|
.th acos 3 2021-03-22 "" "linux programmer's manual"
|
.sh name
|
acos, acosf, acosl \- arc cosine function
|
.sh synopsis
|
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