1#include <errno.h>
2#include <limits.h>
3#include <unistd.h>
4
5long fpathconf(int fd, int name) {
6    static const short values[] = {[_PC_LINK_MAX] = _POSIX_LINK_MAX,
7                                   [_PC_MAX_CANON] = _POSIX_MAX_CANON,
8                                   [_PC_MAX_INPUT] = _POSIX_MAX_INPUT,
9                                   [_PC_NAME_MAX] = NAME_MAX,
10                                   [_PC_PATH_MAX] = PATH_MAX,
11                                   [_PC_PIPE_BUF] = PIPE_BUF,
12                                   [_PC_CHOWN_RESTRICTED] = 1,
13                                   [_PC_NO_TRUNC] = 1,
14                                   [_PC_VDISABLE] = 0,
15                                   [_PC_SYNC_IO] = 1,
16                                   [_PC_ASYNC_IO] = -1,
17                                   [_PC_PRIO_IO] = -1,
18                                   [_PC_SOCK_MAXBUF] = -1,
19                                   [_PC_FILESIZEBITS] = FILESIZEBITS,
20                                   [_PC_REC_INCR_XFER_SIZE] = 4096,
21                                   [_PC_REC_MAX_XFER_SIZE] = 4096,
22                                   [_PC_REC_MIN_XFER_SIZE] = 4096,
23                                   [_PC_REC_XFER_ALIGN] = 4096,
24                                   [_PC_ALLOC_SIZE_MIN] = 4096,
25                                   [_PC_SYMLINK_MAX] = SYMLINK_MAX,
26                                   [_PC_2_SYMLINKS] = 1};
27    if (name < 0 || (size_t)name >= sizeof(values) / sizeof(values[0])) {
28        errno = EINVAL;
29        return -1;
30    }
31    return values[name];
32}
33