glibc/sysdeps/posix/profil.c
Ulrich Drepper ce6e047fbb Update.
2004-07-05  Ulrich Drepper  <drepper@redhat.com>

	* elf/dl-init.c: Don't define and use _dl_starting_up if
	HAVE_INLINED_SYSCALLS is defined and the variable is not used.
	* elf/dl-support.c: Likewise.
	* elf/rtld.c: Likewise.
	* elf/dl-misc.c (_dl_debug_vdprintf): Use writev syscall directly
	if HAVE_INLINED_SYSCALLS is defined.
	* sysdeps/powerpc/powerpc64/dl-machine.h: Don't rest _dl_starting_up
	here.
	* sysdeps/powerpc/powerpc32/dl-start.S: Likewise.
	* sysdeps/unix/sysv/linux/configure.in: Define HAVE_INLINED_SYSCALLS.
	* config.h.in: Add entry for HAVE_INLINED_SYSCALLS.

	* sysdeps/posix/profil.c: If compiled for ld.so, omit code which
	is needed to stop profiling.
	* elf/dl-open.c (dl_open_worker): If a newly opened object is to be
	profile make sure it cannot be unloaded.

	* sysdeps/unix/sysv/linux/dl-origin.c: Inline readlink syscall.

	* sysdeps/unix/sysv/linux/fcntl.c: If compiled without cancellation
	support, make sure the helper function is inlined.
	* sysdeps/unix/sysv/linux/pread.c: Likewise.
	* sysdeps/unix/sysv/linux/pwrite.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/fcntl.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c: Likewise.
2004-07-06 04:26:42 +00:00

120 lines
3.4 KiB
C

/* Low-level statistical profiling support function. Mostly POSIX.1 version.
Copyright (C) 1996,97,98,2002, 2004 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/time.h>
#ifndef SIGPROF
#include <sysdeps/generic/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;
if (sizeof (unsigned long long int) > sizeof (size_t))
i = (unsigned long long int) i * pc_scale / 65536;
else
i = i / 65536 * pc_scale + i % 65536 * 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)
{
struct sigaction act;
struct itimerval timer;
#ifndef IS_IN_rtld
static struct sigaction oact;
static struct itimerval otimer;
# define oact_ptr &oact
# define otimer_ptr &otimer
if (sample_buffer == NULL)
{
/* Disable profiling. */
if (samples == NULL)
/* Wasn't turned on. */
return 0;
if (__setitimer (ITIMER_PROF, &otimer, NULL) < 0)
return -1;
samples = NULL;
return __sigaction (SIGPROF, &oact, NULL);
}
if (samples)
{
/* Was already turned on. Restore old timer and signal handler
first. */
if (__setitimer (ITIMER_PROF, &otimer, NULL) < 0
|| __sigaction (SIGPROF, &oact, NULL) < 0)
return -1;
}
#else
/* In ld.so profiling should never be disabled once it runs. */
//assert (sample_buffer != NULL);
# define oact_ptr NULL
# define otimer_ptr NULL
#endif
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_ptr) < 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_ptr);
}
weak_alias (__profil, profil)
#endif