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/*
* Macro / inline function to add/mark "timestamps" to program in a
* way that can be found from LTT traces. This helps in pinpointing
* when something interesting starts or ends in the trace. Strace can
* be used to get timings for these measurement points.
*
* Copyright (C) 2008 by Nokia Corporation
*
* Contact: Eero Tamminen <eero.tamminen@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This 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.
*
* usage:
* #include "sp_timestamp.h"
* ...
* sp_timestamp("something-interesting-started");
*
* To enable timestamping when building the code in Scratchbox,
* do this before build:
* export SBOX_EXTRA_COMPILER_ARGS="-DSP_TIMESTAMP_CREATE=1"
*
* You can see the timestamps when running the software with:
* strace -f -tt -e trace=open,execve ./binary 2>&1 | grep /tmp/stamps
*
* If the programs are already running, give the program IDs which
* strace should attach to with the "-p PID" argument instead of
* a program name.
*
*
* Implementation differences to Federico's Gnome app stracing tool:
* http://www.gnome.org/~federico/news-2006-03.html#timeline-tools
* - Lower level C-library functions are used instead of Glib
* - Gets process name from /proc/PID/cmdline instead of Gtk
* specific functions (macro version uses just __FILE__)
* - Uses open() syscall instead of access() because LTT doesn't
* record filename used by access() and because programs do
* use open() less (ptrace has its own overhead)
* - Files are in /tmp which on Maemo is tmpfs (in RAM)
*/
#ifndef SP_TIMESTAMP_H
#define SP_TIMESTAMP_H
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#ifndef SP_TIMESTAMP_CREATE
# define sp_timestamp(step)
#else
# ifdef SP_TIMESTAMP_MACRO
/* low overhead macro adding code filename to measurement filename */
# define sp_timestamp(step) { int _tmp_fd; \
_tmp_fd = open("/tmp/stamps/" __FILE__ ":" step, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); \
if (_tmp_fd >=0) close(_tmp_fd); }
# else
#include <sys/types.h>
#include <string.h>
#include <assert.h>
/* higher overhead Linux specific function that adds program name
*/
static inline void sp_timestamp(const char *step)
{
#define SP_TIMESTAMP_PATH "/tmp/stamps/"
int fd, count, offset;
char filename[256], *cmdname;
/* get process command name */
snprintf(filename, sizeof(filename), "/proc/%d/cmdline", getpid());
fd = open(filename, O_RDONLY);
assert(fd >= 0);
strcpy(filename, SP_TIMESTAMP_PATH);
offset = sizeof(SP_TIMESTAMP_PATH)-1;
count = read(fd, filename+offset, sizeof(filename)-offset);
assert(count > 0);
close(fd);
/* take basename of the command name */
cmdname = strrchr(filename+offset, '/');
memmove(filename+offset, cmdname+1, strlen(cmdname));
offset += strlen(filename+offset);
/* add step name */
assert(sizeof(filename) > offset + 1 + strlen(step) + 1);
filename[offset++] = ':';
filename[offset] = '\0';
strcat(filename+offset, step);
fd = open(filename, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
if (fd >= 0) {
close(fd);
}
#undef SP_TIMESTAMP_PATH
}
# endif
#endif
#endif /* SP_TIMESTAMP_H */
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