mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
/* Code to enable profiling at program startup.
|
|
Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/gmon.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
/* Beginning and end of our code segment. We cannot declare them
|
|
as the external functions since we want the addresses of those
|
|
labels. Taking the address of a function may have different
|
|
meanings on different platforms. */
|
|
extern void _start, etext;
|
|
|
|
#ifndef HAVE_INITFINI
|
|
/* This function gets called at startup by the normal constructor
|
|
mechanism. We link this file together with start.o to produce gcrt1.o,
|
|
so this constructor will be first in the list. */
|
|
|
|
void __gmon_start__ (void) __attribute__ ((constructor));
|
|
#else
|
|
/* In ELF and COFF, we cannot use the normal constructor mechanism to call
|
|
__gmon_start__ because gcrt1.o appears before crtbegin.o in the link.
|
|
Instead crti.o calls it specially (see initfini.c). */
|
|
#endif
|
|
|
|
void
|
|
__gmon_start__ (void)
|
|
{
|
|
#ifdef HAVE_INITFINI
|
|
/* Protect from being called more than once. Since crti.o is linked
|
|
into every shared library, each of their init functions will call us. */
|
|
static int called;
|
|
|
|
if (called++)
|
|
return;
|
|
#endif
|
|
|
|
/* Start keeping profiling records. */
|
|
__monstartup ((u_long) &_start, (u_long) &etext);
|
|
|
|
/* Call _mcleanup before exiting; it will write out gmon.out from the
|
|
collected data. */
|
|
atexit (&_mcleanup);
|
|
}
|