說明:
顯示目前mount的狀態
Code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <mntent.h>
#define BOOL int
#define TRUE 0
#define FALSE -1
#define MAX_LONG_LENGTH 1024
#define MAX_SHORT_LENGTH 128
typedef struct mountInfo
{
char dev_name[MAX_SHORT_LENGTH];
char mount_path[MAX_SHORT_LENGTH];
char fs_type[MAX_SHORT_LENGTH];
char attribute[MAX_SHORT_LENGTH];
struct mountInfo *next;
} mountInfoS;
BOOL load_file_fun(char *filename, char **p_content)
{
int fd = -1;
int totalsize = 0;
int readsize = 0;
char buffer[MAX_SHORT_LENGTH];
BOOL ret = FALSE;
if ( (fd = open((char *)filename, O_RDONLY)) > 0 )
{
totalsize = 0;
while( (readsize = read(fd, buffer, MAX_SHORT_LENGTH)) > 0)
totalsize += readsize;
if (totalsize <= 0)
{
printf("[ERROR] %s file size is wrong!\n", filename);
return ret;
}
if (lseek(fd, 0, SEEK_SET) == -1)
{
printf("[ERROR] %s can't seek!\n", filename);
return ret;
}
*p_content = (char*)malloc( ( totalsize + 1) * sizeof(char));
memset(*p_content, '\0', totalsize + 1);
if (*p_content)
{
if(read(fd, *p_content, totalsize) > 0 )
{
ret = TRUE;
}
else
{
printf("[ERROR] %s can't read!\n", filename);
free(*p_content);
}
close(fd);
}
}
else
printf("[ERROR] Open %s fail!\n", filename);
return ret;
}
void get_mount_info_fun(mountInfoS **p_output)
{
char *p_content = NULL;
char *p_tmp = NULL;
char *p_feed = NULL;
char *p_line = NULL;
int len = 0;
int loop = 0;
char *sep = "\t ";
char * pch;
mountInfoS *p_new, *p_first, *p_cur;
p_new = p_first = p_cur = NULL;
if (load_file_fun("/proc/mounts", &p_content) == TRUE)
{
p_tmp = p_content;
while((p_feed = strpbrk(p_tmp, "\n")))
{
len = p_feed - p_tmp;
p_line = (char*)malloc(len + 1);
memset(p_line, '\0', len + 1);
strncpy(p_line, p_tmp, len);
pch = strtok(p_line, sep);
if (pch)
{
p_new = malloc(sizeof(mountInfoS));
memset(p_new, '\0', sizeof(mountInfoS));
loop = 0;
strcpy( p_new->dev_name, pch);
while (pch != NULL)
{
pch = strtok (NULL, sep);
loop++;
if (loop == 1)
strcpy( p_new->mount_path, pch);
else if (loop == 2)
strcpy( p_new->fs_type, pch);
else if (loop == 3)
strcpy( p_new->attribute, pch);
}
if ( p_first == NULL )
{
p_first = p_cur = p_new;
}
else
{
p_cur->next = p_new;
p_cur = p_new;
}
}
free(p_line);
p_tmp = p_feed + 1;
}
}
if (p_content)
free(p_content);
*p_output = p_first;
}
void free_mount_info_fun(mountInfoS *p_input)
{
mountInfoS *p_cur = p_input;
mountInfoS *p_tmp;
p_tmp = p_cur;
while( p_cur )
{
p_tmp = p_cur;
p_cur = p_cur->next;
free( p_tmp );
}
}
int main(int argc, char *argv[])
{
mountInfoS *p_info = NULL;
mountInfoS *p_tmp = NULL;
get_mount_info_fun(&p_info);
if(p_info)
{
p_tmp = p_info;
while(p_tmp)
{
printf("dev_name : %s ", p_tmp->dev_name);
printf("mount_path : %s ", p_tmp->mount_path);
printf("fs_type : %s ", p_tmp->fs_type);
printf("attribute : %s\n", p_tmp->attribute);
p_tmp = p_tmp->next;
}
free_mount_info_fun(p_info);
}
return 0;
}
Result:
dev_name : sysfs mount_path : /sys fs_type : sysfs attribute : rw,nosuid,nodev,noexec,relatime
dev_name : proc mount_path : /proc fs_type : proc attribute : rw,nosuid,nodev,noexec,relatime
dev_name : udev mount_path : /dev fs_type : devtmpfs attribute : rw,nosuid,noexec,relatime,size=16359368k,nr_inodes=4089842,mode=755,inode64
dev_name : devpts mount_path : /dev/pts fs_type : devpts attribute : rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
dev_name : tmpfs mount_path : /run fs_type : tmpfs attribute : rw,nosuid,nodev,noexec,relatime,size=3278556k,mode=755,inode64
......
