/* 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. */ extern void _start (void), etext (void); #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); }