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//! Process execution domains
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 {
/// Provide the legacy virtual address space layout.
ADDR_COMPAT_LAYOUT;
/// Disable address-space-layout randomization.
ADDR_NO_RANDOMIZE;
/// Limit the address space to 32 bits.
ADDR_LIMIT_32BIT;
/// Use `0xc0000000` as the offset at which to search a virtual memory
/// chunk on [`mmap(2)`], otherwise use `0xffffe000`.
///
/// [`mmap(2)`]: https://man7.org/linux/man-pages/man2/mmap.2.html
ADDR_LIMIT_3GB;
/// User-space function pointers to signal handlers point to descriptors.
#[cfg(not(any(target_env = "musl", target_env = "uclibc")))]
#[cfg_attr(docsrs, doc(cfg(all())))]
FDPIC_FUNCPTRS;
/// Map page 0 as read-only.
MMAP_PAGE_ZERO;
/// `PROT_READ` implies `PROT_EXEC` for [`mmap(2)`].
///
/// [`mmap(2)`]: https://man7.org/linux/man-pages/man2/mmap.2.html
READ_IMPLIES_EXEC;
/// No effects.
SHORT_INODE;
/// [`select(2)`], [`pselect(2)`], and [`ppoll(2)`] do not modify the
/// returned timeout argument when interrupted by a signal handler.
///
/// [`select(2)`]: https://man7.org/linux/man-pages/man2/select.2.html
/// [`pselect(2)`]: https://man7.org/linux/man-pages/man2/pselect.2.html
/// [`ppoll(2)`]: https://man7.org/linux/man-pages/man2/ppoll.2.html
STICKY_TIMEOUTS;
/// Have [`uname(2)`] report a 2.6.40+ version number rather than a 3.x
/// version number.
///
/// [`uname(2)`]: https://man7.org/linux/man-pages/man2/uname.2.html
#[cfg(not(any(target_env = "musl", target_env = "uclibc")))]
#[cfg_attr(docsrs, doc(cfg(all())))]
UNAME26;
/// No effects.
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).unwrap();
/// ```
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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