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/*
* stap_merge.c - systemtap merge program
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) Red Hat Inc, 2005-2007
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
static void usage (char *prog)
{
fprintf(stderr, "%s [-o output_filename] input_files ...\n", prog);
exit(1);
}
#define TIMESTAMP_SIZE (sizeof(int))
#define NR_CPUS 256
int main (int argc, char *argv[])
{
char *outfile_name = NULL;
char buf[8192];
int c, i, j, dropped=0;
long count=0, min, num[NR_CPUS];
FILE *ofp, *fp[NR_CPUS];
int ncpus, len;
while ((c = getopt (argc, argv, "o:")) != EOF) {
switch (c) {
case 'o':
outfile_name = optarg;
break;
default:
usage(argv[0]);
}
}
if (optind == argc)
usage (argv[0]);
i = 0;
while (optind < argc) {
fp[i] = fopen(argv[optind++], "r");
if (!fp[i]) {
fprintf(stderr, "error opening file %s.\n", argv[optind - 1]);
return -1;
}
if (fread (buf, TIMESTAMP_SIZE, 1, fp[i]))
num[i] = *((int *)buf);
else
num[i] = 0;
i++;
}
ncpus = i;
if (!outfile_name)
ofp = stdout;
else {
ofp = fopen(outfile_name, "w");
if (!ofp) {
fprintf(stderr, "ERROR: couldn't open output file %s: errcode = %s\n",
outfile_name, strerror(errno));
return -1;
}
}
do {
min = num[0];
j = 0;
for (i = 1; i < ncpus; i++) {
if (min == 0 || (num[i] && num[i] < min)) {
min = num[i];
j = i;
}
}
if (fread(&len, sizeof(int), 1, fp[j])) {
fread(buf, len, 1, fp[j]);
fwrite(buf, len, 1, ofp);
}
if (min && ++count != min) {
fprintf(stderr, "got %ld. expected %ld\n", min, count);
dropped += min - count ;
count = min;
}
if (fread (buf, TIMESTAMP_SIZE, 1, fp[j]))
num[j] = *((int *)buf);
else
num[j] = 0;
} while (min);
for (i = 0; i < ncpus; i++)
fclose (fp[i]);
fclose (ofp);
printf ("sequence had %d drops\n", dropped);
return 0;
}
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