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use crate::Result;
use crate::errno::Errno;
use libc::{self, c_int, c_ulong};
libc_bitflags! {
/// Flags used and returned by [`get()`](fn.get.html) and
/// [`set()`](fn.set.html).
pub struct Persona: c_int {
ADDR_COMPAT_LAYOUT;
ADDR_NO_RANDOMIZE;
ADDR_LIMIT_32BIT;
ADDR_LIMIT_3GB;
#[cfg(not(any(target_env = "musl", target_env = "uclibc")))]
FDPIC_FUNCPTRS;
MMAP_PAGE_ZERO;
READ_IMPLIES_EXEC;
SHORT_INODE;
STICKY_TIMEOUTS;
#[cfg(not(any(target_env = "musl", target_env = "uclibc")))]
UNAME26;
WHOLE_SECONDS;
}
}
/// Retrieve the current process personality.
///
/// Returns a Result containing a Persona instance.
///
/// Example:
///
/// ```
/// # use nix::sys::personality::{self, Persona};
/// let pers = personality::get().unwrap();
/// assert!(!pers.contains(Persona::WHOLE_SECONDS));
/// ```
pub fn get() -> Result<Persona> {
let res = unsafe {
libc::personality(0xFFFFFFFF)
};
Errno::result(res).map(Persona::from_bits_truncate)
}
/// Set the current process personality.
///
/// Returns a Result containing the *previous* personality for the
/// process, as a Persona.
///
/// For more information, see [personality(2)](https://man7.org/linux/man-pages/man2/personality.2.html)
///
/// **NOTE**: This call **replaces** the current personality entirely.
/// To **update** the personality, first call `get()` and then `set()`
/// with the modified persona.
///
/// Example:
///
/// ```
/// # use nix::sys::personality::{self, Persona};
/// let mut pers = personality::get().unwrap();
/// assert!(!pers.contains(Persona::ADDR_NO_RANDOMIZE));
/// personality::set(pers | Persona::ADDR_NO_RANDOMIZE);
/// ```
pub fn set(persona: Persona) -> Result<Persona> {
let res = unsafe {
libc::personality(persona.bits() as c_ulong)
};
Errno::result(res).map(Persona::from_bits_truncate)
}
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