This routine provides a means to find out in what areas
your program spends most of its time. The argument buf points to bufsiz bytes of core. Every
virtual 10 milliseconds, the user's program counter (PC) is
examined: offset is
subtracted and the result is multiplied by scale and divided by 65536. If
the resulting value is less than bufsiz, then the corresponding
entry in buf is
incremented. If buf
is NULL, profiling is disabled.
RETURN VALUE
Zero is always returned.
CONFORMING TO
Similar to a call in SVr4 (but not POSIX.1-2001).
BUGS
profil() cannot be used on a
program that also uses ITIMER_PROF itimers.
True kernel profiling provides more accurate results. Libc
4.4 contained a kernel patch providing a system call
profil.
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
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manual page may be incorrect or out-of-date.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.
Modified Fri Jun 23 01:35:19 1995 Andries Brouwer <aeb@cwi.nl>
(prompted by Bas V. de Bakker <bas@phys.uva.nl>)
Corrected (and moved to man3), 980612, aeb