/usr/src/blcr-0.8.5/tests/save_aux.c is in blcr-dkms 0.8.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | /*
* Berkeley Lab Checkpoint/Restart (BLCR) for Linux is Copyright (c)
* 2007, The Regents of the University of California, through Lawrence
* Berkeley National Laboratory (subject to receipt of any required
* approvals from the U.S. Dept. of Energy). All rights reserved.
*
* Portions may be copyrighted by others, as may be noted in specific
* copyright notices within specific files.
*
* 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
*
* $Id: save_aux.c,v 1.8 2008/07/26 06:38:15 phargrov Exp $
*
* Simple program to generate mmaps() as requred for testing --save-* options
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>
#include "crut_util.h"
static const char *chkpt_cmd;
void checkpoint_self(const char *chkpt_args)
{
char *cmd = NULL;
int ret;
cmd = crut_aprintf("exec %s %s %d", chkpt_cmd, chkpt_args, (int)getpid());
ret = system(cmd);
if (!WIFEXITED(ret) || WEXITSTATUS(ret)) {
fprintf(stderr, "'%s' failed %d (%d)\n", cmd, ret, WEXITSTATUS(ret));
exit(1);
}
free(cmd);
}
void validate(volatile char **addr, int count, int pagesize) {
int i;
for (i=0; i <count; ++i) {
if (*addr[i] != 1) {
fprintf(stderr, "Failed to read back from first page\n");
exit(1);
}
if (*(addr[i] + pagesize) != 0) {
fprintf(stderr, "Failed to read back from last page\n");
exit(1);
}
}
}
enum {
MSG_CHILD_READY = 12,
MSG_CHKPT_DONE
};
int main(int argc, const char **argv) {
struct crut_pipes pipes;
volatile char **addr;
const char *chkpt_args;
pid_t pid;
int pagesize = getpagesize();
int i;
if (argc < 2) {
fprintf(stderr, "%s: need chkpt_args as 1st argument\n", argv[0]);
exit(1);
}
chkpt_cmd = crut_find_cmd(argv[0], "cr_checkpoint");
chkpt_args = argv[1];
addr = calloc(argc-2, sizeof(char *));
for (i=2; i <argc; ++i) {
char *filename;
int flags, fd;
volatile char *tmp;
/* Parse mode arg */
switch (argv[i][0]) {
case 'S': flags = MAP_SHARED; break;
case 'P': flags = MAP_PRIVATE; break;
default: fprintf(stderr, "Invalid argument '%s'\n", argv[i]);
exit(-1);
}
/* Create a file */
filename = crut_aprintf("tstmap%d", i-1);
fd = open(filename, O_CREAT|O_RDWR|O_TRUNC, S_IREAD|S_IWRITE);
if (fd < 0) {
perror("open()");
exit(-1);
}
/* Extend to 2 pages in length */
if (ftruncate(fd, 2*pagesize) < 0) {
perror("ftruncate()");
exit(-1);
}
/* mmap() it */
tmp = mmap(NULL, 2*pagesize, PROT_READ|PROT_WRITE, flags, fd, 0);
if (tmp == MAP_FAILED) {
perror("mmap()");
exit(-1);
}
(void)close(fd);
/* dirty first page */
*tmp = 1;
addr[i-2] = tmp;
}
/* Fork a child to do like us */
pid = crut_pipes_fork(&pipes);
if (pid) {
/* Parent */
crut_pipes_expect(&pipes, MSG_CHILD_READY);
checkpoint_self(chkpt_args);
crut_pipes_putchar(&pipes, MSG_CHKPT_DONE);
validate(addr, argc-2, pagesize);
crut_waitpid_expect(pipes.child, 0);
crut_pipes_close(&pipes);
} else {
/* Child */
crut_pipes_putchar(&pipes, MSG_CHILD_READY);
crut_pipes_expect(&pipes, MSG_CHKPT_DONE);
validate(addr, argc-2, pagesize);
}
return 0;
}
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