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#+private
package os
import "base:runtime"
import "core:c"
import "core:sys/posix"
_posix_absolute_path :: proc(fd: posix.FD, name: string, allocator: runtime.Allocator) -> (path: cstring, err: Error) {
// NOTE(Feoramund): The situation isn't ideal, but this was the best way I
// could find to implement this. There are a couple outstanding bug reports
// regarding the desire to retrieve an absolute path from a handle, but to
// my knowledge, there hasn't been any work done on it.
//
// https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198570
//
// This may be unreliable, according to a comment from 2023.
KInfo_File :: struct {
structsize: c.int,
type: c.int,
fd: c.int,
ref_count: c.int,
flags: c.int,
pad0: c.int,
offset: i64,
// NOTE(Feoramund): This field represents a complicated union that I am
// avoiding implementing for now. I only need the path data below.
_union: [336]byte,
path: [posix.PATH_MAX]c.char,
}
F_KINFO :: 22
kinfo: KInfo_File
kinfo.structsize = size_of(KInfo_File)
res := posix.fcntl(fd, posix.FCNTL_Cmd(F_KINFO), &kinfo)
if res == -1 {
err = _get_platform_error()
return
}
return clone_to_cstring(string(cstring(&kinfo.path[0])), allocator)
}
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