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/*
* Copyright (C) 2008-2013, Parallels, Inc. All rights reserved.
*
* 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
*/
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <getopt.h>
#include <dirent.h>
#include <unistd.h>
#include <limits.h>
#include "ploop.h"
#define FMT "/sys/block/%s/pstat"
static void usage(void)
{
fprintf(stderr, "Usage: ploop stat [-c | -l] -d DEVICE\n");
}
static int open_sysfs_file(char * devid, char *name, int flags)
{
char buf[PATH_MAX];
snprintf(buf, sizeof(buf)-1, FMT "/%s", devid, name);
return open(buf, flags);
}
static DIR * open_sysfs_dir(char * devid)
{
char buf[sizeof(FMT) + strlen(devid)];
snprintf(buf, sizeof(buf)-1, FMT, devid);
return opendir(buf);
}
int plooptool_stat(int argc, char **argv)
{
int i;
int clear = 0;
int load = 0;
DIR *dp;
struct dirent *de;
char * device = NULL;
int ret = 0;
while ((i = getopt(argc, argv, "cld:")) != EOF) {
switch (i) {
case 'c':
clear = 1;
break;
case 'l':
load = 1;
break;
case 'd':
device = optarg;
break;
default:
usage();
return SYSEXIT_PARAM;
}
}
argc -= optind;
argv += optind;
if (argc || !device) {
usage();
return SYSEXIT_PARAM;
}
if (memcmp(device, "/dev/", 5) == 0)
device += 5;
dp = open_sysfs_dir(device);
if (dp == NULL) {
perror("sysfs opendir");
return SYSEXIT_SYSFS;
}
if (load) {
char buf[128];
while (fgets(buf, sizeof(buf)-1, stdin)) {
char name[128];
unsigned int val;
int fd;
buf[sizeof(buf)-1] = 0;
if (sscanf(buf, "%s%u", name, &val) != 2)
continue;
fd = open_sysfs_file(device, name, O_WRONLY);
if (fd < 0) {
fprintf(stderr, "Variable \"%s\" is missing\n", name);
continue;
}
snprintf(buf, sizeof(buf)-1, "%u\n", val);
if (write(fd, buf, strlen(buf)) <= 0)
perror("write");
close(fd);
}
goto out;
}
while ((de = readdir(dp)) != NULL) {
int fd = -1;
int n;
char buf[128];
if (de->d_name[0] == '.')
continue;
fd = open_sysfs_file(device, de->d_name, clear ? O_WRONLY : O_RDONLY);
if (fd < 0) {
perror("openat");
ret = SYSEXIT_SYSFS;
goto out;
}
if (clear) {
if (write(fd, "0\n", 2) <= 0)
perror("write");
} else {
n = read(fd, buf, sizeof(buf)-1);
if (n < 0) {
perror("read");
close(fd);
ret = SYSEXIT_SYSFS;
goto out;
}
buf[n] = 0;
printf("%-20s\t%s", de->d_name, buf);
}
close(fd);
}
out:
closedir(dp);
return ret;
}
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