39 lines
966 B
C
39 lines
966 B
C
|
#include <sys/stat.h>
|
||
|
#include <fcntl.h>
|
||
|
#include <errno.h>
|
||
|
#include "syscall.h"
|
||
|
#include "kstat.h"
|
||
|
|
||
|
int fchmodat(int fd, const char *path, mode_t mode, int flag)
|
||
|
{
|
||
|
if (!flag) return syscall(SYS_fchmodat, fd, path, mode, flag);
|
||
|
|
||
|
if (flag != AT_SYMLINK_NOFOLLOW)
|
||
|
return __syscall_ret(-EINVAL);
|
||
|
|
||
|
struct kstat st;
|
||
|
int ret, fd2;
|
||
|
char proc[15+3*sizeof(int)];
|
||
|
|
||
|
if ((ret = __syscall(SYS_fstatat, fd, path, &st, flag)))
|
||
|
return __syscall_ret(ret);
|
||
|
if (S_ISLNK(st.st_mode))
|
||
|
return __syscall_ret(-EOPNOTSUPP);
|
||
|
|
||
|
if ((fd2 = __syscall(SYS_openat, fd, path, O_RDONLY|O_PATH|O_NOFOLLOW|O_NOCTTY|O_CLOEXEC)) < 0) {
|
||
|
if (fd2 == -ELOOP)
|
||
|
return __syscall_ret(-EOPNOTSUPP);
|
||
|
return __syscall_ret(fd2);
|
||
|
}
|
||
|
|
||
|
__procfdname(proc, fd2);
|
||
|
ret = __syscall(SYS_fstatat, AT_FDCWD, proc, &st, 0);
|
||
|
if (!ret) {
|
||
|
if (S_ISLNK(st.st_mode)) ret = -EOPNOTSUPP;
|
||
|
else ret = __syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
|
||
|
}
|
||
|
|
||
|
__syscall(SYS_close, fd2);
|
||
|
return __syscall_ret(ret);
|
||
|
}
|