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use errno::{SysResult, SysError};
use std::io::FilePermission;
use fcntl::{Fd, OFlag};
use libc::{c_void, size_t, off_t, mode_t};
pub use self::consts::*;
#[cfg(target_os = "linux")]
mod consts {
use libc::c_int;
pub type MmapFlag = c_int;
pub const MAP_SHARED: MmapFlag = 0x00001;
pub const MAP_PRIVATE: MmapFlag = 0x00002;
pub const MAP_FIXED: MmapFlag = 0x00010;
pub const MAP_FILE: MmapFlag = 0x00000;
pub const MAP_ANONYMOUS: MmapFlag = 0x00020;
pub const MAP_ANON: MmapFlag = MAP_ANONYMOUS;
pub const MAP_32BIT: MmapFlag = 0x00040;
pub const MAP_GROWSDOWN: MmapFlag = 0x00100;
pub const MAP_DENYWRITE: MmapFlag = 0x00800;
pub const MAP_EXECUTABLE: MmapFlag = 0x01000;
pub const MAP_LOCKED: MmapFlag = 0x02000;
pub const MAP_NORESERVE: MmapFlag = 0x04000;
pub const MAP_POPULATE: MmapFlag = 0x08000;
pub const MAP_NONBLOCK: MmapFlag = 0x10000;
pub const MAP_STACK: MmapFlag = 0x20000;
pub const MAP_HUGETLB: MmapFlag = 0x40000;
pub type MmapProt = c_int;
pub const PROT_READ: MmapProt = 0x1;
pub const PROT_WRITE: MmapProt = 0x2;
pub const PROT_EXEC: MmapProt = 0x4;
pub const PROT_NONE: MmapProt = 0x0;
pub const PROT_GROWSDOWN: MmapProt = 0x01000000;
pub const PROT_GROWSUP: MmapProt = 0x02000000;
pub type MmapAdvise = c_int;
pub const MADV_NORMAL : MmapAdvise = 0; /* No further special treatment. */
pub const MADV_RANDOM : MmapAdvise = 1; /* Expect random page references. */
pub const MADV_SEQUENTIAL : MmapAdvise = 2; /* Expect sequential page references. */
pub const MADV_WILLNEED : MmapAdvise = 3; /* Will need these pages. */
pub const MADV_DONTNEED : MmapAdvise = 4; /* Don't need these pages. */
pub const MADV_REMOVE : MmapAdvise = 9; /* Remove these pages and resources. */
pub const MADV_DONTFORK : MmapAdvise = 10; /* Do not inherit across fork. */
pub const MADV_DOFORK : MmapAdvise = 11; /* Do inherit across fork. */
pub const MADV_MERGEABLE : MmapAdvise = 12; /* KSM may merge identical pages. */
pub const MADV_UNMERGEABLE: MmapAdvise = 13; /* KSM may not merge identical pages. */
pub const MADV_HUGEPAGE : MmapAdvise = 14; /* Worth backing with hugepages. */
pub const MADV_NOHUGEPAGE : MmapAdvise = 15; /* Not worth backing with hugepages. */
pub const MADV_DONTDUMP : MmapAdvise = 16; /* Explicity exclude from the core dump, overrides the coredump filter bits. */
pub const MADV_DODUMP : MmapAdvise = 17; /* Clear the MADV_DONTDUMP flag. */
pub const MADV_HWPOISON : MmapAdvise = 100; /* Poison a page for testing. */
pub type MmapSync = c_int;
pub const MS_ASYNC : MmapSync = 1;
pub const MS_SYNC : MmapSync = 4;
pub const MS_INVALIDATE : MmapSync = 2;
pub const MAP_FAILED: int = -1;
}
#[cfg(any(target_os = "macos",
target_os = "ios"))]
mod consts {
use libc::c_int;
pub type MmapFlag = c_int;
pub const MAP_SHARED: MmapFlag = 0x00001;
pub const MAP_PRIVATE: MmapFlag = 0x00002;
pub const MAP_FIXED: MmapFlag = 0x00010;
pub const MAP_NOCACHE: MmapFlag = 0x00400;
pub const MAP_JIT: MmapFlag = 0x00800;
pub type MmapProt = c_int;
pub const PROT_READ: MmapProt = 0x1;
pub const PROT_WRITE: MmapProt = 0x2;
pub const PROT_EXEC: MmapProt = 0x4;
pub const PROT_NONE: MmapProt = 0x0;
pub type MmapAdvise = c_int;
pub const MADV_NORMAL : MmapAdvise = 0; /* No further special treatment. */
pub const MADV_RANDOM : MmapAdvise = 1; /* Expect random page references. */
pub const MADV_SEQUENTIAL : MmapAdvise = 2; /* Expect sequential page references. */
pub const MADV_WILLNEED : MmapAdvise = 3; /* Will need these pages. */
pub const MADV_DONTNEED : MmapAdvise = 4; /* Don't need these pages. */
pub const MADV_FREE : MmapAdvise = 5; /* pages unneeded, discard contents */
pub const MADV_ZERO_WIRED_PAGES: MmapAdvise = 6; /* zero the wired pages that have not been unwired before the entry is deleted */
pub const MADV_FREE_REUSABLE : MmapAdvise = 7; /* pages can be reused (by anyone) */
pub const MADV_FREE_REUSE : MmapAdvise = 8; /* caller wants to reuse those pages */
pub const MADV_CAN_REUSE : MmapAdvise = 9;
pub type MmapSync = c_int;
pub const MS_ASYNC : MmapSync = 0x0001; /* [MF|SIO] return immediately */
pub const MS_INVALIDATE : MmapSync = 0x0002; /* [MF|SIO] invalidate all cached data */
pub const MS_SYNC : MmapSync = 0x0010; /* [MF|SIO] msync synchronously */
pub const MS_KILLPAGES : MmapSync = 0x0004; /* invalidate pages, leave mapped */
pub const MS_DEACTIVATE : MmapSync = 0x0008; /* deactivate pages, leave mapped */
pub const MAP_FAILED: int = -1;
}
mod ffi {
use libc::{c_void, size_t, c_int, c_char, mode_t};
pub use libc::{mmap, munmap};
extern {
pub fn shm_open(name: *const c_char, oflag: c_int, mode: mode_t) -> c_int;
pub fn shm_unlink(name: *const c_char) -> c_int;
pub fn mlock(addr: *const c_void, len: size_t) -> c_int;
pub fn munlock(addr: *const c_void, len: size_t) -> c_int;
pub fn madvise (addr: *const c_void, len: size_t, advice: c_int) -> c_int;
pub fn msync (addr: *const c_void, len: size_t, flags: c_int) -> c_int;
}
}
pub unsafe fn mlock(addr: *const c_void, length: size_t) -> SysResult<()> {
match ffi::mlock(addr, length) {
0 => Ok(()),
_ => Err(SysError::last())
}
}
pub fn munlock(addr: *const c_void, length: size_t) -> SysResult<()> {
match unsafe { ffi::munlock(addr, length) } {
0 => Ok(()),
_ => Err(SysError::last())
}
}
/// Calls to mmap are inherently unsafe, so they must be made in an unsafe block. Typically
/// a higher-level abstraction will hide the unsafe interactions with the mmap'd region.
pub fn mmap(addr: *mut c_void, length: size_t, prot: MmapProt, flags: MmapFlag, fd: Fd, offset: off_t) -> SysResult<*mut c_void> {
let ret = unsafe { ffi::mmap(addr, length, prot, flags, fd, offset) };
if ret as int == MAP_FAILED {
Err(SysError::last())
} else {
Ok(ret)
}
}
pub fn munmap(addr: *mut c_void, len: size_t) -> SysResult<()> {
match unsafe { ffi::munmap(addr, len) } {
0 => Ok(()),
_ => Err(SysError::last())
}
}
pub fn madvise(addr: *const c_void, length: size_t, advise: MmapAdvise) -> SysResult<()> {
match unsafe { ffi::madvise(addr, length, advise) } {
0 => Ok(()),
_ => Err(SysError::last())
}
}
pub fn msync(addr: *const c_void, length: size_t, flags: MmapSync) -> SysResult<()> {
match unsafe { ffi::msync(addr, length, flags) } {
0 => Ok(()),
_ => Err(SysError::last())
}
}
pub fn shm_open(name: &String, flag: OFlag, mode: FilePermission) -> SysResult<Fd> {
let ret = unsafe { ffi::shm_open(name.to_c_str().as_ptr(), flag.bits(), mode.bits() as mode_t) };
if ret < 0 {
Err(SysError::last())
} else {
Ok(ret)
}
}
pub fn shm_unlink(name: &String) -> SysResult<()> {
let ret = unsafe { ffi::shm_unlink(name.to_c_str().as_ptr()) };
if ret < 0 {
Err(SysError::last())
} else {
Ok(())
}
}
|
