chmod 예제

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

int main(void) {
    struct stat statbuf;

    if (stat("foo", &statbuf) < 0 ) {
        perror("stat error for foo");
        return -1;
    }

    int chmodValue = chmod("foo", (statbuf.st_mode & ~S_IXGRP) | S_ISGID);
    if (chmodValue < 0) {
        perror("chmod error for foo");
        return -1;
    }

    int chmod2Value = chmod("bar", S_IRUSR| S_IWUSR| S_IRGRP| S_IROTH);
    if (chmod2Value < 0) {
        perror("chmod error for foo");
        return -1;
    }

    return 0;
}

S_IRWXU

read, write, execute/search by owner

S_IRUSR

read permission, owner

S_IWUSR

write permission, owner

S_IXUSR

execute/search permission, owner

S_IRWXG

read, write, execute/search by group

S_IRGRP

read permission, group

S_IWGRP

write permission, group

S_IXGRP

execute/search permission, group

S_IRWXO

read, write, execute/search by others

S_IROTH

read permission, others

S_IWOTH

write permission, others

S_IXOTH

execute/search permission, others

S_ISUID

set-user-ID on execution

S_ISGID

set-group-ID on execution

S_ISVTX

on directories, restricted deletion flag

http://opengroup.org/onlinepubs/007908775/xsh/sysstat.h.html