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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