[444] | 1 | #include <sys/stat.h>
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| 2 | #include <fcntl.h>
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| 3 | #include <errno.h>
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| 4 | #include "syscall.h"
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| 5 |
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| 6 | void __procfdname(char *, unsigned);
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| 7 |
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| 8 | int fchmodat(int fd, const char *path, mode_t mode, int flag)
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| 9 | {
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| 10 | if (!flag) return syscall(SYS_fchmodat, fd, path, mode, flag);
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| 11 |
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| 12 | if (flag != AT_SYMLINK_NOFOLLOW)
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| 13 | return __syscall_ret(-EINVAL);
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| 14 |
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| 15 | struct stat st;
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| 16 | int ret, fd2;
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| 17 | char proc[15+3*sizeof(int)];
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| 18 |
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| 19 | if ((ret = __syscall(SYS_fstatat, fd, path, &st, flag)))
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| 20 | return __syscall_ret(ret);
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| 21 | if (S_ISLNK(st.st_mode))
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| 22 | return __syscall_ret(-EOPNOTSUPP);
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| 23 |
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| 24 | if ((fd2 = __syscall(SYS_openat, fd, path, O_RDONLY|O_PATH|O_NOFOLLOW|O_NOCTTY|O_CLOEXEC)) < 0) {
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| 25 | if (fd2 == -ELOOP)
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| 26 | return __syscall_ret(-EOPNOTSUPP);
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| 27 | return __syscall_ret(fd2);
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| 28 | }
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| 29 |
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| 30 | __procfdname(proc, fd2);
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| 31 | ret = __syscall(SYS_fstatat, AT_FDCWD, proc, &st, 0);
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| 32 | if (!ret) {
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| 33 | if (S_ISLNK(st.st_mode)) ret = -EOPNOTSUPP;
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| 34 | else ret = __syscall(SYS_fchmodat, AT_FDCWD, proc, mode);
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| 35 | }
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| 36 |
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| 37 | __syscall(SYS_close, fd2);
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| 38 | return __syscall_ret(ret);
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| 39 | }
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