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st_mode 값은 비트별로 되어 있는가요?

skylandi의 이미지
글쓴이: skylandi / 작성시간: 목, 2003/03/27 - 1:59오전

#define XPERM 0777 // 소유자에게 읽기 쓰기 실행 권한을 줍

statinfo.st_mode |=XPERM;

프로그램 중에서 비트별 OR을 하는데 statinfo.st_mode 값을
찍어 봣는데 33279 나오길래 손으로 계산이 영 ㅜㅜ;

자세히 알필요가 없다면 대충 넘어 가고 싶은데 넘 궁금해서요

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프로그래밍 QnA
pynoos의 이미지

글쓴이: pynoos / 작성시간: 목, 2003/03/27 - 2:03오전

man page의 이걸 다 설명해달라는 것인가요? ^^
굳이 설명이 필요없을 것 같은데... bitwise-OR로 표현된다는 것 외에는...

The following flags are defined for the st_mode field:

S_IFMT 0170000 bitmask for the file type bitfields
S_IFSOCK 0140000 socket
S_IFLNK 0120000 symbolic link
S_IFREG 0100000 regular file
S_IFBLK 0060000 block device
S_IFDIR 0040000 directory
S_IFCHR 0020000 character device
S_IFIFO 0010000 fifo
S_ISUID 0004000 set UID bit
S_ISGID 0002000 set GID bit (see below)
S_ISVTX 0001000 sticky bit (see below)
S_IRWXU 00700 mask for file owner permissions
S_IRUSR 00400 owner has read permission
S_IWUSR 00200 owner has write permission
S_IXUSR 00100 owner has execute permission
S_IRWXG 00070 mask for group permissions
S_IRGRP 00040 group has read permission
S_IWGRP 00020 group has write permission
S_IXGRP 00010 group has execute permission
S_IRWXO 00007 mask for permissions for others (not in group)
S_IROTH 00004 others have read permission
S_IWOTH 00002 others have write permisson
S_IXOTH 00001 others have execute permission

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