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authorUlrich Drepper <drepper@redhat.com>1999-08-08 22:20:38 +0000
committerUlrich Drepper <drepper@redhat.com>1999-08-08 22:20:38 +0000
commit87843f15168b086d3f6d255ebfe311e314560004 (patch)
treece4fa30eaf5581e7f0eb08a0def89c3e9504d568 /debug/pcprofile.c
parent754549b3bed222fd15d748605143e5925296a7fc (diff)
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Update.
1999-08-08 Ulrich Drepper <drepper@cygnus.com> * string/bits/string2.h: Mark void* operations as extensions. * sysdeps/i386/i486/bits/string.h: Likewise. * debug/Makefile (routines): Add noophooks. (extra-libs): Add libpcprofile. Add rules to build libpcprofile. * debug/noophooks.c: New file. * debug/pcprofile.c: New file.
Diffstat (limited to 'debug/pcprofile.c')
-rw-r--r--debug/pcprofile.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/debug/pcprofile.c b/debug/pcprofile.c
new file mode 100644
index 0000000..b5dc4e7
--- /dev/null
+++ b/debug/pcprofile.c
@@ -0,0 +1,75 @@
+/* Profile PC and write result to FIFO.
+ Copyright (C) 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
+
+ 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 <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* Nonzero if we are actually doing something. */
+static int active;
+
+/* The file descriptor of the FIFO. */
+static int fd;
+
+
+static void
+__attribute__ ((constructor))
+install (void)
+{
+ /* See whether the environment variable `PCPROFILE_OUTPUT' is defined.
+ If yes, it should name a FIFO. We open it and mark ourself as active. */
+ const char *outfile = getenv ("PCPROFILE_OUTPUT");
+
+ if (outfile != NULL && *outfile != '\0')
+ {
+ fd = open (outfile, O_RDWR);
+
+ if (fd != -1)
+ active = 1;
+ }
+}
+
+
+static void
+__attribute__ ((destructor))
+uninstall (void)
+{
+ if (active)
+ close (fd);
+}
+
+
+void
+__cyg_profile_func_enter (void *this_fn, void *call_site)
+{
+ void *buf[2];
+
+ if (! active)
+ return;
+
+ /* Now write out the current position and that of the caller. We do
+ this now, and don't cache the because we want real-time output. */
+ buf[0] = this_fn;
+ buf[1] = call_site;
+
+ write (fd, buf, sizeof buf);
+}
+/* We don't handle entry and exit differently here. */
+strong_alias (__cyg_profile_func_enter, __cyg_profile_func_exit)