__libc-subinit implementation.

[kopensolaris-gnu/glibc.git] / csu / gmon-start.c

diff --git a/csu/gmon-start.c b/csu/gmon-start.c
index c9d51b1..8c66905 100644 (file)
--- a/csu/gmon-start.c
+++ b/csu/gmon-start.c
@@ -1,21 +1,21 @@
 /* Code to enable profiling at program startup.
-Copyright (C) 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+   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 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.
+   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., 675 Mass Ave,
-Cambridge, MA 02139, USA.  */
+   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>
@@ -23,25 +23,36 @@ Cambridge, MA 02139, USA.  */
 #include <unistd.h>
 
 /* Beginning and end of our code segment.  */
-extern void _start (), etext ();
-
-/* These functions are defined in gmon/gmon.c;
-   they do all the work of setting up and cleaning up profiling.  */
-extern void monstartup (u_long, u_long);
-extern void _mcleanup (void);
+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.  */
-static void gmon_start (void) __attribute__ ((constructor));
-static void
-gmon_start (void)
+
+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);
+  __monstartup ((u_long) &_start, (u_long) &etext);
 
-  /* Call _mcleanup before exitting; it will write out gmon.out from the
+  /* Call _mcleanup before exiting; it will write out gmon.out from the
      collected data.  */
   atexit (&_mcleanup);
 }
-