std::unix::os current_exe implementation simplification for haiku.

_get_net_image_info is a bit overkill as it allows to get broader
informations about the process.

library/std/src/sys/pal/unix/os.rs

@@ -462,21 +462,21 @@ pub fn current_exe() -> io::Result<PathBuf> {
 
 #[cfg(target_os = "haiku")]
 pub fn current_exe() -> io::Result<PathBuf> {
+ let mut name = vec![0; libc::PATH_MAX as usize];
  unsafe {
- let mut info: mem::MaybeUninit<libc::image_info> = mem::MaybeUninit::uninit();
- let mut cookie: i32 = 0;
- // the executable can be found at team id 0
- let result = libc::_get_next_image_info(
- 0,
- &mut cookie,
- info.as_mut_ptr(),
- mem::size_of::<libc::image_info>(),
+ let result = libc::find_path(
+ std::ptr::null_mut(),
+ libc::path_base_directory::B_FIND_PATH_IMAGE_PATH,
+ std::ptr::null_mut(),
+ name.as_mut_ptr(),
+ name.len(),
  );
- if result != 0 {
+ if result != libc::B_OK {
  use crate::io::ErrorKind;
  Err(io::const_io_error!(ErrorKind::Uncategorized, "Error getting executable path"))
  } else {
- let name = CStr::from_ptr((*info.as_ptr()).name.as_ptr()).to_bytes();
+ // find_path adds the null terminator.
+ let name = CStr::from_ptr(name.as_ptr()).to_bytes();
  Ok(PathBuf::from(OsStr::from_bytes(name)))
  }
  }