Function nix::unistd::fpathconf

source · 
pub fn fpathconf(fd: RawFd, var: PathconfVar) -> Result<Option<c_long>>
Expand description

Like pathconf, but works with file descriptors instead of paths (see fpathconf(2))

§Parameters

  • fd: The file descriptor whose variable should be interrogated
  • var: The pathconf variable to lookup

§Returns

  • Ok(Some(x)): the variable’s limit (for limit variables) or its implementation level (for option variables). Implementation levels are usually a decimal-coded date, such as 200112 for POSIX 2001.12
  • Ok(None): the variable has no limit (for limit variables) or is unsupported (for option variables)
  • Err(x): an error occurred