158 lines
3.8 KiB
HTML
158 lines
3.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of PROFIL</TITLE>
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</HEAD><BODY>
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<H1>PROFIL</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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profil - execution time profile
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/unistd.h">unistd.h</A>></B>
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<B>int profil(unsigned short *</B><I>buf</I><B>, size_t </B><I>bufsiz</I><B>,</B>
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<B> size_t </B><I>offset</I><B>, unsigned int </B><I>scale</I><B>);</B>
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</PRE>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>profil</B>():
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<PRE>
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Since glibc 2.21:
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_DEFAULT_SOURCE
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In glibc 2.19 and 2.20:
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_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
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Up to and including glibc 2.19:
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_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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This routine provides a means to find out in what areas your program
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spends most of its time.
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The argument
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<I>buf</I>
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points to
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<I>bufsiz</I>
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bytes of core.
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Every virtual 10 milliseconds, the user's program counter (PC)
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is examined:
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<I>offset</I>
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is subtracted and the result is multiplied by
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<I>scale</I>
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and divided by 65536.
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If the resulting value is less than
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<I>bufsiz</I>,
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then the corresponding entry in
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<I>buf</I>
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is incremented.
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If
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<I>buf</I>
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is NULL, profiling is disabled.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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Zero is always returned.
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<A NAME="lbAF"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>profil</B>()
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</TD><TD>Thread safety</TD><TD>MT-Unsafe<BR></TD></TR>
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</TABLE>
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<P>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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Similar to a call in SVr4 (but not POSIX.1).
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<A NAME="lbAH"> </A>
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<H2>BUGS</H2>
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<B>profil</B>()
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cannot be used on a program that also uses
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<B>ITIMER_PROF</B>
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interval timers (see
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<B><A HREF="/cgi-bin/man/man2html?2+setitimer">setitimer</A></B>(2)).
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<P>
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True kernel profiling provides more accurate results.
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Libc 4.4 contained a kernel patch providing a system call profil.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+gprof">gprof</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+sprof">sprof</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?2+setitimer">setitimer</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sigaction">sigaction</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+signal">signal</A></B>(2)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="5"><A HREF="#lbAF">ATTRIBUTES</A><DD>
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<DT id="6"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="7"><A HREF="#lbAH">BUGS</A><DD>
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<DT id="8"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="9"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:52 GMT, March 31, 2021
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</BODY>
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</HTML>
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