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#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <sys/mount.h>
char *
size_desc(long long bytes)
{
static char ret[256];
double kib, mib, gib;
kib = bytes / 1024.0;
mib = kib / 1024.0;
gib = mib / 1024.0;
if (gib > 10.0)
sprintf(ret, "%.0f GiB", gib);
else if (gib >= 1.0)
sprintf(ret, "%.1f GiB", gib);
else if (mib >= 100.0)
sprintf(ret, "%.0f MiB", mib);
else if (mib >= 1.0)
sprintf(ret, "%.1f MiB", mib);
else if (kib >= 100.0)
sprintf(ret, "%.0f kiB", kib);
else if (kib >= 1.0)
sprintf(ret, "%.1f kiB", kib);
else
sprintf(ret, "%lld B", bytes);
return ret;
}
void
modprobe(const char *mod)
{
FILE *fp;
char *cmd;
char printk[1024] = "";
if ((fp = fopen("/proc/sys/kernel/printk", "r")) != NULL) {
fgets(printk, sizeof(printk), fp);
fclose(fp);
}
if ((fp = fopen("/proc/sys/kernel/printk", "w")) != NULL) {
fputs("0\n", fp);
fclose(fp);
}
asprintf(&cmd, "modprobe %s >>/var/log/messages 2>&1", mod);
system(cmd);
free(cmd);
if ((fp = fopen("/proc/sys/kernel/printk", "w")) != NULL) {
fputs(printk, fp);
fclose(fp);
}
}
/*
* Check if something's already mounted on /target/mntpoint
*/
int
check_proc_mounts(const char *mntpoint)
{
FILE *fp;
char buf[1024], mnt[1024];
char *tmp;
if ((fp = fopen("/proc/mounts", "r")) == NULL)
return 0;
asprintf(&tmp, "/target%s", mntpoint);
while (fgets(buf, sizeof(buf), fp) != NULL) {
sscanf(buf, "%*s %s", mnt);
if (strcmp(tmp, mnt) == 0) {
free(tmp);
fclose(fp);
return 1;
}
}
free(tmp);
fclose(fp);
return 0;
}
/*
* Check if the given device is already activated as a swap
*/
int
check_proc_swaps(const char *dev)
{
FILE *fp;
char buf[1024];
if ((fp = fopen("/proc/swaps", "r")) == NULL)
return 0;
fgets(buf, sizeof(buf), fp);
while (fgets(buf, sizeof(buf), fp) != NULL) {
if (strstr(buf, dev) == buf) {
fclose(fp);
return 1;
}
}
fclose(fp);
return 0;
}
void
append_message(const char *fmt, ...)
{
FILE *fp;
va_list ap;
if ((fp = fopen("/var/log/messages", "a")) == NULL)
return;
va_start(ap, fmt);
vfprintf(fp, fmt, ap);
fclose(fp);
va_end(ap);
}
/*
* Counts the number of occurrences of c in s
*/
int
strcount(const char *s, int c)
{
const char *p;
int ret = 0;
p = s;
while ((p = index(p, c)) != NULL) {
ret++;
p++;
}
return ret;
}
/*
*
*/
int
umount_target(void)
{
FILE *fp;
char buf[1024], mnt[1024];
char *mounts[1024];
int i, m_count = 0;
int sort_func(const void *v1, const void *v2)
{
char *m1, *m2;
m1 = *(char **)v1;
m2 = *(char **)v2;
if (m1 == NULL && m2 == NULL)
return 0;
else if (m1 == NULL)
return -1;
else if (m2 == NULL)
return 1;
if (strstr(m1, m2) == m1)
return -1;
else if (strstr(m2, m1) == m2)
return 1;
else
return strcmp(m2, m1);
}
if ((fp = fopen("/proc/mounts", "r")) == NULL)
return 0;
while (fgets(buf, sizeof(buf), fp) != NULL) {
sscanf(buf, "%*s %s", mnt);
if (strstr(mnt, "/target") != mnt)
continue;
mounts[m_count++] = strdup(mnt);
}
fclose(fp);
if (m_count == 0)
return 1;
qsort(mounts, m_count, sizeof(char *), sort_func);
for (i = 0; i < m_count; i++) {
if (umount(mounts[i]) < 0)
return 0;
}
return 1;
}
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