Erkunden Sie Dateitypen in Linux-Systemen: normale Dateien, Verzeichnisse und spezielle Dateien

 struct stat {
 unsigned long st_dev;
 unsigned long st_ino;
 unsigned short st_mode;
 unsigned short st_nlink;
 unsigned short st_uid;
 unsigned short st_gid;
 unsigned long st_rdev;
 unsigned long st_size;
 unsigned long st_blksize;
 unsigned long st_blocks;
 unsigned long st_atime;
 unsigned long st_atime_nsec;
 unsigned long st_mtime;
 unsigned long st_mtime_nsec;
 unsigned long st_ctime;
 unsigned long st_ctime_nsec;
 unsigned long __unused4;
 unsigned long __unused5;
};	

...
#define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
#define S_ISCHR(mode) __S_ISTYPE((mode), __S_IFCHR)
#define S_ISBLK(mode) __S_ISTYPE((mode), __S_IFBLK)
#define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
#ifdef __S_IFIFO
# define S_ISFIFO(mode) __S_ISTYPE((mode), __S_IFIFO)
#endif
#ifdef __S_IFLNK
# define S_ISLNK(mode) __S_ISTYPE((mode), __S_IFLNK)
#endif
...

#include 
#include 
#include 
#include 
int main(int argc, char* argv[])
{
 if(argc < 2){
 printf("ntusage:");
 printf("ntt%s filepathn", argv[0]);
 return -1;
 }
 struct stat tmp;
 char* res;
 lstat(argv[1], &tmp);
 if(S_ISREG(tmp.st_mode))
 res = "regular";
 else if(S_ISDIR(tmp.st_mode))
 res = "directory";
 else if(S_ISBLK(tmp.st_mode))
 res = "block";
 else if(S_ISLNK(tmp.st_mode))
 res = "link";
 else if(S_ISFIFO(tmp.st_mode))
 res = "fifo";
 else if(S_ISSOCK(tmp.st_mode))
 res = "socket";
 else
 res = "unknown";
 printf("%s : %sn", argv[1], res);
 return 0;
}

# gcc t6.c
# ./a.out 
 usage:
 ./a.out filepath
# ./a.out ../
../ : directory
# ./a.out t.c
t.c : regular
root@lcc:/lccRoot/C/tmp# ./a.out ../
../ : directory
# ./a.out /dev/log
/dev/log : socket
#