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//! Standard symbolic constants and types
//!
use {Error, Result, NixPath, from_ffi};
use errno::Errno;
use fcntl::{fcntl, OFlag, O_NONBLOCK, O_CLOEXEC, FD_CLOEXEC};
use fcntl::FcntlArg::{F_SETFD, F_SETFL};
use libc::{c_char, c_void, c_int, size_t, pid_t, off_t};
use std::mem;
use std::ffi::CString;
use std::os::unix::io::RawFd;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub use self::linux::*;
mod ffi {
use libc::{c_char, c_int, size_t};
pub use libc::{close, read, write, pipe, ftruncate, unlink};
pub use libc::funcs::posix88::unistd::{fork, getpid, getppid};
extern {
// duplicate a file descriptor
// doc: http://man7.org/linux/man-pages/man2/dup.2.html
pub fn dup(oldfd: c_int) -> c_int;
pub fn dup2(oldfd: c_int, newfd: c_int) -> c_int;
// change working directory
// doc: http://man7.org/linux/man-pages/man2/chdir.2.html
pub fn chdir(path: *const c_char) -> c_int;
// Execute PATH with arguments ARGV and environment from `environ'.
// doc: http://man7.org/linux/man-pages/man3/execv.3.html
pub fn execv (path: *const c_char, argv: *const *const c_char) -> c_int;
// execute program
// doc: http://man7.org/linux/man-pages/man2/execve.2.html
pub fn execve(path: *const c_char, argv: *const *const c_char, envp: *const *const c_char) -> c_int;
// Execute FILE, searching in the `PATH' environment variable if it contains
// no slashes, with arguments ARGV and environment from `environ'.
// doc: http://man7.org/linux/man-pages/man3/execvp.3.html
pub fn execvp(filename: *const c_char, argv: *const *const c_char) -> c_int;
// doc: http://man7.org/linux/man-pages/man3/exec.3.html
#[cfg(any(target_os = "linux", target_os = "android"))]
#[cfg(feature = "execvpe")]
pub fn execvpe(filename: *const c_char, argv: *const *const c_char, envp: *const *const c_char) -> c_int;
// run the current process in the background
// doc: http://man7.org/linux/man-pages/man3/daemon.3.html
pub fn daemon(nochdir: c_int, noclose: c_int) -> c_int;
// sets the hostname to the value given
// doc: http://man7.org/linux/man-pages/man2/gethostname.2.html
pub fn gethostname(name: *mut c_char, len: size_t) -> c_int;
// gets the hostname
// doc: http://man7.org/linux/man-pages/man2/sethostname.2.html
pub fn sethostname(name: *const c_char, len: size_t) -> c_int;
// change root directory
// doc: http://man7.org/linux/man-pages/man2/chroot.2.html
pub fn chroot(path: *const c_char) -> c_int;
// synchronize a file's in-core state with storage device
// doc: http://man7.org/linux/man-pages/man2/fsync.2.html
pub fn fsync(fd: c_int) -> c_int;
pub fn fdatasync(fd: c_int) -> c_int;
}
}
#[derive(Clone, Copy)]
pub enum Fork {
Parent(pid_t),
Child
}
impl Fork {
pub fn is_child(&self) -> bool {
match *self {
Fork::Child => true,
_ => false
}
}
pub fn is_parent(&self) -> bool {
match *self {
Fork::Parent(_) => true,
_ => false
}
}
}
pub fn fork() -> Result<Fork> {
use self::Fork::*;
let res = unsafe { ffi::fork() };
if res < 0 {
return Err(Error::Sys(Errno::last()));
} else if res == 0 {
Ok(Child)
} else {
Ok(Parent(res))
}
}
#[inline]
pub fn getpid() -> pid_t {
unsafe { ffi::getpid() } // no error handling, according to man page: "These functions are always successful."
}
#[inline]
pub fn getppid() -> pid_t {
unsafe { ffi::getppid() } // no error handling, according to man page: "These functions are always successful."
}
#[inline]
pub fn dup(oldfd: RawFd) -> Result<RawFd> {
let res = unsafe { ffi::dup(oldfd) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(res)
}
#[inline]
pub fn dup2(oldfd: RawFd, newfd: RawFd) -> Result<RawFd> {
let res = unsafe { ffi::dup2(oldfd, newfd) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(res)
}
pub fn dup3(oldfd: RawFd, newfd: RawFd, flags: OFlag) -> Result<RawFd> {
dup3_polyfill(oldfd, newfd, flags)
}
#[inline]
fn dup3_polyfill(oldfd: RawFd, newfd: RawFd, flags: OFlag) -> Result<RawFd> {
use errno::EINVAL;
if oldfd == newfd {
return Err(Error::Sys(Errno::EINVAL));
}
let fd = try!(dup2(oldfd, newfd));
if flags.contains(O_CLOEXEC) {
if let Err(e) = fcntl(fd, F_SETFD(FD_CLOEXEC)) {
let _ = close(fd);
return Err(e);
}
}
Ok(fd)
}
#[inline]
pub fn chdir<P: ?Sized + NixPath>(path: &P) -> Result<()> {
let res = try!(path.with_nix_path(|cstr| {
unsafe { ffi::chdir(cstr.as_ptr()) }
}));
if res != 0 {
return Err(Error::Sys(Errno::last()));
}
return Ok(())
}
fn to_exec_array(args: &[CString]) -> Vec<*const c_char> {
use std::ptr;
use libc::c_char;
let mut args_p: Vec<*const c_char> = args.iter().map(|s| s.as_ptr()).collect();
args_p.push(ptr::null());
args_p
}
#[inline]
pub fn execv(path: &CString, argv: &[CString]) -> Result<()> {
let args_p = to_exec_array(argv);
unsafe {
ffi::execv(path.as_ptr(), args_p.as_ptr())
};
Err(Error::Sys(Errno::last()))
}
#[inline]
pub fn execve(path: &CString, args: &[CString], env: &[CString]) -> Result<()> {
let args_p = to_exec_array(args);
let env_p = to_exec_array(env);
unsafe {
ffi::execve(path.as_ptr(), args_p.as_ptr(), env_p.as_ptr())
};
Err(Error::Sys(Errno::last()))
}
#[inline]
pub fn execvp(filename: &CString, args: &[CString]) -> Result<()> {
let args_p = to_exec_array(args);
unsafe {
ffi::execvp(filename.as_ptr(), args_p.as_ptr())
};
Err(Error::Sys(Errno::last()))
}
pub fn daemon(nochdir: bool, noclose: bool) -> Result<()> {
let res = unsafe { ffi::daemon(nochdir as c_int, noclose as c_int) };
from_ffi(res)
}
pub fn sethostname(name: &[u8]) -> Result<()> {
let ptr = name.as_ptr() as *const c_char;
let len = name.len() as size_t;
let res = unsafe { ffi::sethostname(ptr, len) };
from_ffi(res)
}
pub fn gethostname(name: &mut [u8]) -> Result<()> {
let ptr = name.as_mut_ptr() as *mut c_char;
let len = name.len() as size_t;
let res = unsafe { ffi::gethostname(ptr, len) };
from_ffi(res)
}
pub fn close(fd: RawFd) -> Result<()> {
let res = unsafe { ffi::close(fd) };
from_ffi(res)
}
pub fn read(fd: RawFd, buf: &mut [u8]) -> Result<usize> {
let res = unsafe { ffi::read(fd, buf.as_mut_ptr() as *mut c_void, buf.len() as size_t) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
return Ok(res as usize)
}
pub fn write(fd: RawFd, buf: &[u8]) -> Result<usize> {
let res = unsafe { ffi::write(fd, buf.as_ptr() as *const c_void, buf.len() as size_t) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
return Ok(res as usize)
}
pub fn pipe() -> Result<(RawFd, RawFd)> {
unsafe {
let mut fds: [c_int; 2] = mem::uninitialized();
let res = ffi::pipe(fds.as_mut_ptr());
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok((fds[0], fds[1]))
}
}
pub fn pipe2(flags: OFlag) -> Result<(RawFd, RawFd)> {
unsafe {
let mut fds: [c_int; 2] = mem::uninitialized();
let res = ffi::pipe(fds.as_mut_ptr());
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
try!(pipe2_setflags(fds[0], fds[1], flags));
Ok((fds[0], fds[1]))
}
}
fn pipe2_setflags(fd1: RawFd, fd2: RawFd, flags: OFlag) -> Result<()> {
let mut res = Ok(0);
if flags.contains(O_CLOEXEC) {
res = res
.and_then(|_| fcntl(fd1, F_SETFD(FD_CLOEXEC)))
.and_then(|_| fcntl(fd2, F_SETFD(FD_CLOEXEC)));
}
if flags.contains(O_NONBLOCK) {
res = res
.and_then(|_| fcntl(fd1, F_SETFL(O_NONBLOCK)))
.and_then(|_| fcntl(fd2, F_SETFL(O_NONBLOCK)));
}
match res {
Ok(_) => Ok(()),
Err(e) => {
let _ = close(fd1);
let _ = close(fd2);
return Err(e);
}
}
}
pub fn ftruncate(fd: RawFd, len: off_t) -> Result<()> {
if unsafe { ffi::ftruncate(fd, len) } < 0 {
Err(Error::Sys(Errno::last()))
} else {
Ok(())
}
}
pub fn isatty(fd: RawFd) -> Result<bool> {
use libc;
if unsafe { libc::isatty(fd) } == 1 {
Ok(true)
} else {
match Errno::last() {
// ENOTTY means `fd` is a valid file descriptor, but not a TTY, so
// we return `Ok(false)`
Errno::ENOTTY => Ok(false),
err => Err(Error::Sys(err))
}
}
}
pub fn unlink<P: ?Sized + NixPath>(path: &P) -> Result<()> {
let res = try!(path.with_nix_path(|cstr| {
unsafe {
ffi::unlink(cstr.as_ptr())
}
}));
from_ffi(res)
}
#[inline]
pub fn chroot<P: ?Sized + NixPath>(path: &P) -> Result<()> {
let res = try!(path.with_nix_path(|cstr| {
unsafe { ffi::chroot(cstr.as_ptr()) }
}));
if res != 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
#[inline]
pub fn fsync(fd: RawFd) -> Result<()> {
let res = unsafe { ffi::fsync(fd) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
#[inline]
pub fn fdatasync(fd: RawFd) -> Result<()> {
let res = unsafe { ffi::fdatasync(fd) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
#[cfg(any(target_os = "linux", target_os = "android"))]
mod linux {
use sys::syscall::{syscall, SYSPIVOTROOT};
use errno::Errno;
use {Error, Result, NixPath};
#[cfg(feature = "execvpe")]
use std::ffi::CString;
pub fn pivot_root<P1: ?Sized + NixPath, P2: ?Sized + NixPath>(
new_root: &P1, put_old: &P2) -> Result<()> {
let res = try!(try!(new_root.with_nix_path(|new_root| {
put_old.with_nix_path(|put_old| {
unsafe {
syscall(SYSPIVOTROOT, new_root.as_ptr(), put_old.as_ptr())
}
})
})));
if res != 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
#[inline]
#[cfg(feature = "execvpe")]
pub fn execvpe(filename: &CString, args: &[CString], env: &[CString]) -> Result<()> {
use std::ptr;
use libc::c_char;
let mut args_p: Vec<*const c_char> = args.iter().map(|s| s.as_ptr()).collect();
args_p.push(ptr::null());
let mut env_p: Vec<*const c_char> = env.iter().map(|s| s.as_ptr()).collect();
env_p.push(ptr::null());
unsafe {
super::ffi::execvpe(filename.as_ptr(), args_p.as_ptr(), env_p.as_ptr())
};
Err(Error::Sys(Errno::last()))
}
}
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