stat関数でできることをチェック。コマンドライン引数でファイルとかシンボリックリンクとか指定するとstatまたはlstatを呼び出してチェックできる。

gistfile1.mak

CC = gcc
OPT = -O2 -Wall

BIN = stat_test
default: bin
bin: $(BIN)

stat_test: stat_test.o
        $(CC) $(OPT) -o $@ $<

.c.o:
        $(CC) $(OPT) -o $@ -c $<

clean:
        rm -f $(BIN) *.o *~

stat_test.c

#include <stdio.h>
#include <sys/stat.h>

#include <time.h>
#include <errno.h>
#include <string.h>
#include <pwd.h>

void profile_stat(const struct stat st);

int main(int argc, char* argv[])
{
  int i;
  struct stat st;
  

  for(i = 1; i < argc; i++){
    printf("argv[%d]: %s\n",i,argv[i]);
  }

  if(argc < 2){
    printf("No arguments for stat_test.\n");
  } else {
    for(i = 1; i < argc; i++){

      printf("==== target -> \"%s\" ====\n",argv[i]);

      // stat check 
      printf("== [stat mode] ==\n");

      if(stat(argv[i],&st) == 0){

        profile_stat(st);

      } else { // stat error

        perror("stat error");

        printf("== [lstat mode] ==\n");
        if(lstat(argv[i],&st) == 0){
          profile_stat(st);
        } else { // lstat error
          perror("lstat error");
        }

      }
    } /* end for-loop */
  }
  return 0;
}

void profile_stat(const struct stat st)
{
  int flag;
  struct passwd *pw;
  
  /* File Type */
  printf("  Type: ");
  switch(st.st_mode & S_IFMT){
  case S_IFSOCK: printf("Socket\n"); break;
  case S_IFLNK:  printf("SymLink\n"); break;
  case S_IFREG:  printf("RegularFile\n"); break;
  case S_IFBLK:  printf("BlockDevice\n"); break;
  case S_IFDIR:  printf("Directory\n"); break;
  case S_IFCHR:  printf("CharDevice\n"); break;
  case S_IFIFO:  printf("FIFO\n"); break;
  default:       printf("UNKNOWN\n"); break;
  }

  /* Permission */
  flag = st.st_mode & (~S_IFMT);
  
  printf("  User: ");
  if((flag & S_IRUSR) != 0) printf("Readable "); else printf("         ");
  if((flag & S_IWUSR) != 0) printf("Writable "); else printf("         ");
  if((flag & S_IXUSR) != 0) printf("Executable"); 
  printf("\n");
  printf(" Group: ");
  if((flag & S_IRGRP) != 0) printf("Readable "); else printf("         ");
  if((flag & S_IWGRP) != 0) printf("Writable "); else printf("         ");
  if((flag & S_IXGRP) != 0) printf("Executable");
  printf("\n");
  printf("Others: ");
  if((flag & S_IROTH) != 0) printf("Readable "); else printf("         ");
  if((flag & S_IWOTH) != 0) printf("Writable "); else printf("         ");
  if((flag & S_IXOTH) != 0) printf("Executable");
  printf("\n"); 
  
  /* get user name, group name */
  pw = getpwuid(st.st_uid);

  /* Miscellaneous Attributes */
  printf("    Device ID : %10d\n",(int)st.st_dev);
  printf("     inode ID : %10d\n",(int)st.st_ino);
  printf("Hard Link Num : %10d\n",(int)st.st_nlink);
  printf("      User ID : %10d(%s)\n",(int)st.st_uid, pw->pw_name);
  printf("     Group ID : %10d\n",(int)st.st_gid);
  printf("Device ID(sp) : %10d\n",(int)st.st_rdev);
  printf("         Size : %10d(byte)\n",(int)st.st_size);
  printf("   Block Size : %10d\n",(int)st.st_blksize);
  printf("       Blocks : %10d\n",(int)st.st_blocks);
  printf("Last Access   : %s",ctime(&(st.st_atime)));
  printf("Last Modified : %s",ctime(&(st.st_mtime)));
  printf("Last Create   : %s",ctime(&(st.st_ctime)));
  
  return;
}