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POSIX:sys/stat

Methods 

int    chmod(const char *, mode_t);
int    fchmod(int, mode_t);
int    fstat(int, struct stat *);
int    lstat(const char *, struct stat *);
int    mkdir(const char *, mode_t);
int    mkfifo(const char *, mode_t);
int    mknod(const char *, mode_t, dev_t);
int    stat(const char *, struct stat *);
mode_t umask(mode_t);

check macros

  • S_ISDIR: directory
  • S_ISREG: regular file
  • S_ISCHR: character device
  • S_ISBLK: block device
  • S_ISFIFO: FIFO
  • S_ISLNK: symbolic link
  • S_ISSOCK: socket

Directory exists 

#include <sys/stat.h>
struct stat sb;
if (stat(pathname, &sb) == 0 && S_ISDIR(sb.st_mode))
{
    ...it is a directory...
}

Windows & MinGW version

  • _S_IFMT: 파일 형식 마스크
  • _S_IFDIR: 디렉터리
  • _S_IFCHR: 특수 문자 (이면 장치 설정)
  • _S_IFREG: 기본
  • _S_IREAD: 읽기 권한, 소유자
  • _S_IWRITE: 쓰기 권한, 소유자
  • _S_IEXEC: 사용 권한, 실행 검색 소유자

mode_t

sys/stat.h provides you with several integers you can bytewise-OR (|) together to create your mode_t:

  • User: S_IRUSR (read), S_IWUSR (write), S_IXUSR (execute)
  • Group: S_IRGRP (read), S_IWGRP (write), S_IXGRP (execute)
  • Others: S_IROTH (read), S_IWOTH (write), S_IXOTH (execute)

Additionally, some shortcuts are provided (basically a bitwise-OR combination of the above

  • Read + Write + Execute: S_IRWXU (User), S_IRWXG (Group), S_IRWXO (Others)
  • DEFFILEMODE: Equivalent of 0666 = rw-rw-rw-
  • ACCESSPERMS: Equivalent of 0777 = rwxrwxrwx Therefore, to give only the user rwx (read+write+execute) rights whereas group members and others may not do anything, you can use any of the following mkdir() calls equivalently: 
mkdir("mydir", S_IRUSR | S_IWUSR | S_IXUSR);
mkdir("mydir", S_IRWXU);

In order to give anyone any rights (mode 0777 = rwxrwxrwx), you can use any of the following calls equivalently: 

mkdir("mydir", S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH);
mkdir("mydir", S_IRWXU | S_IRWXG | S_IRWXO);
mkdir("mydir", ACCESSPERMS);

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Source code

References

  1. System_section_-_file_stat_functions.pdf ↩