move msghdr and cmsghdr out of bits/socket.h
[musl.git] / src / stat / fchmodat.c
blobbe61bdf3b224ee5002b222dd19e0702ef4558dc5
1 #include <sys/stat.h>
2 #include <fcntl.h>
3 #include <errno.h>
4 #include "syscall.h"
6 int fchmodat(int fd, const char *path, mode_t mode, int flag)
8 if (!flag) return syscall(SYS_fchmodat, fd, path, mode, flag);
10 if (flag != AT_SYMLINK_NOFOLLOW)
11 return __syscall_ret(-EINVAL);
13 struct stat st;
14 int ret, fd2;
15 char proc[15+3*sizeof(int)];
17 if ((ret = __syscall(SYS_fstatat, fd, path, &st, flag)))
18 return __syscall_ret(ret);
19 if (S_ISLNK(st.st_mode))
20 return __syscall_ret(-EOPNOTSUPP);
22 if ((fd2 = __syscall(SYS_openat, fd, path, O_RDONLY|O_PATH|O_NOFOLLOW|O_NOCTTY|O_CLOEXEC)) < 0) {
23 if (fd2 == -ELOOP)
24 return __syscall_ret(-EOPNOTSUPP);
25 return __syscall_ret(fd2);
28 __procfdname(proc, fd2);
29 ret = __syscall(SYS_fstatat, AT_FDCWD, proc, &st, 0);
30 if (!ret) {
31 if (S_ISLNK(st.st_mode)) ret = -EOPNOTSUPP;
32 else ret = __syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
35 __syscall(SYS_close, fd2);
36 return __syscall_ret(ret);