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authorRoland McGrath <roland@gnu.org>1996-03-01 17:40:28 +0000
committerRoland McGrath <roland@gnu.org>1996-03-01 17:40:28 +0000
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parent4a9af5c70897a71fe0999a1369146a43dc72414e (diff)
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Fri Mar 1 10:09:46 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>
* posix/glob.c: Use canonical code from autoconf manual for dirent include. [_D_NAMLEN]: Redefine NAMLEN using this. (glob_in_dir): Use NAMLEN macro. * sysdeps/posix/profil.c: New file. Thu Feb 29 20:55:57 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/unix/sysv/linux/m68k/profil-counter.h: New file. * libc-symbols.h [GCC >= 2.8] (strong_alias, weak_alias): Remove `extern' keyword. * time/zic.c, time/zdump.c, time/private.h: Updated from ADO 96e.
Diffstat (limited to 'sysdeps/posix/profil.c')
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diff --git a/sysdeps/posix/profil.c b/sysdeps/posix/profil.c
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+/* Low-level statistical profiling support function. Mostly POSIX.1 version.
+Copyright (C) 1996 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., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/time.h>
+
+#ifndef SIGPROF
+
+#include_next <profil.c>
+
+#else
+
+static u_short *samples;
+static size_t nsamples;
+static size_t pc_offset;
+static u_int pc_scale;
+
+static inline void
+profil_count (void *pc)
+{
+ size_t i = ((pc - pc_offset - (void *) 0) / 2) * pc_scale / 65536;
+ if (i < nsamples)
+ ++samples[i];
+}
+
+/* Get the machine-dependent definition of `profil_counter', the signal
+ handler for SIGPROF. It calls `profil_count' (above) with the PC of the
+ interrupted code. */
+#include "profil-counter.h"
+
+/* Enable statistical profiling, writing samples of the PC into at most
+ SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
+ is enabled, the system examines the user PC and increments
+ SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
+ disable profiling. Returns zero on success, -1 on error. */
+
+int
+profil (u_short *sample_buffer, size_t size, size_t offset, u_int scale)
+{
+ static struct sigaction act, oact;
+ static struct itimerval timer, otimer;
+
+ if (sample_buffer == NULL)
+ {
+ /* Disable profiling. */
+ if (samples == NULL)
+ /* Wasn't turned on. */
+ return 0;
+ samples = NULL;
+
+ if (sigaction (SIGPROF, &oact, NULL) < 0)
+ return -1;
+ return setitimer (ITIMER_PROF, &otimer, NULL);
+ }
+
+ samples = sample_buffer;
+ nsamples = size / sizeof *samples;
+ pc_offset = offset;
+ pc_scale = scale;
+
+ act.sa_handler = (sighandler_t) &profil_counter;
+ act.sa_flags = SA_RESTART;
+ sigfillset (&act.sa_mask);
+ if (sigaction (SIGPROF, &act, &oact) < 0)
+ return -1;
+
+ timer.it_value.tv_sec = 0;
+ timer.it_value.tv_usec = 1;
+ timer.it_interval = timer.it_value;
+ return setitimer (ITIMER_PROF, &timer, &otimer);
+}
+
+#endif