65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* Code to enable profiling at program startup.
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Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/types.h>
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#include <sys/gmon.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* Beginning and end of our code segment. We cannot declare them
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as the external functions since we want the addresses of those
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labels. Taking the address of a function may have different
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meanings on different platforms. */
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extern void _start, etext;
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#ifndef HAVE_INITFINI
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/* This function gets called at startup by the normal constructor
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mechanism. We link this file together with start.o to produce gcrt1.o,
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so this constructor will be first in the list. */
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extern void __gmon_start__ (void) __attribute__ ((constructor));
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#else
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/* In ELF and COFF, we cannot use the normal constructor mechanism to call
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__gmon_start__ because gcrt1.o appears before crtbegin.o in the link.
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Instead crti.o calls it specially (see initfini.c). */
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extern void __gmon_start__ (void);
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#endif
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void
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__gmon_start__ (void)
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{
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#ifdef HAVE_INITFINI
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/* Protect from being called more than once. Since crti.o is linked
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into every shared library, each of their init functions will call us. */
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static int called;
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if (called)
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return;
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called = 1;
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#endif
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/* Start keeping profiling records. */
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__monstartup ((u_long) &_start, (u_long) &etext);
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/* Call _mcleanup before exiting; it will write out gmon.out from the
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collected data. */
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atexit (&_mcleanup);
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}
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