/usr/share/doc/libcr-dev/pipe_counting.c is in libcr-dev 0.8.5-2.2.
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 | /*
* 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: pipe_counting.c,v 1.4 2008/09/03 04:13:02 phargrov Exp $
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
static int limit = 120; /* default */
int do_read(int fd, char *p, size_t len) {
int rc;
while (len) {
rc = read(fd, p ,len);
if (rc < 0 && errno == EINTR) continue;
if (rc <= 0) return rc;
len -= rc;
p += rc;
}
return 1;
}
int main(int argc, char *argv[])
{
int exitcode = 0;
int fds[2];
pid_t pid;
int i;
printf("Counting demo starting with pid %d, pgid %d\n", (int)getpid(), (int)getpgrp());
if (argc > 1) {
limit = (i = atoi(argv[1])) > 0 ? i : limit;
}
(void)pipe(fds);
pid = fork();
if (pid == 0) {
/* CHILD */
int value;
close(fds[1]);
while (do_read(fds[0], (char*)&value, sizeof(int))) {
printf("Count = %d\n", value);
fflush(stdout);
}
if (value != (limit-1)) {
fprintf(stderr, "FAILED: premature EOF at value = %d\n", value);
exitcode = 1;
}
} else if (pid > 0) {
/* PARENT */
int i, status;
close(fds[0]);
for (i=0; i<limit; ++i) {
write(fds[1], &i, sizeof(int));
sleep(1);
}
close(fds[1]); /* generates EOF in child */
i = waitpid(pid, &status, 0);
if (i != (int)pid) {
fprintf(stderr, "FAILED: waitpid(%d) returned %d (errno=%d %s)\n", (int)pid, i, errno, strerror(errno));
exitcode = 2;
} else if (WIFEXITED(status)) {
exitcode = WEXITSTATUS(status);
}
if (!exitcode) {
printf("SUCCESS\n");
}
}
return exitcode;
}
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