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use libc::{mod, c_int, c_void};
use c_str::CString;
use mem;
use io;
use prelude::*;
use io::{FilePermission, Write, UnstableFileStat, Open, FileAccess, FileMode};
use io::{IoResult, FileStat, SeekStyle};
use io::{Read, Truncate, SeekCur, SeekSet, ReadWrite, SeekEnd, Append};
use sys::retry;
use sys_common::{keep_going, eof, mkerr_libc};
pub type fd_t = libc::c_int;
pub struct FileDesc {
fd: fd_t,
close_on_drop: bool,
}
impl FileDesc {
pub fn new(fd: fd_t, close_on_drop: bool) -> FileDesc {
FileDesc { fd: fd, close_on_drop: close_on_drop }
}
pub fn read(&self, buf: &mut [u8]) -> IoResult<uint> {
let ret = retry(|| unsafe {
libc::read(self.fd(),
buf.as_mut_ptr() as *mut libc::c_void,
buf.len() as libc::size_t)
});
if ret == 0 {
Err(eof())
} else if ret < 0 {
Err(super::last_error())
} else {
Ok(ret as uint)
}
}
pub fn write(&self, buf: &[u8]) -> IoResult<()> {
let ret = keep_going(buf, |buf, len| {
unsafe {
libc::write(self.fd(), buf as *const libc::c_void,
len as libc::size_t) as i64
}
});
if ret < 0 {
Err(super::last_error())
} else {
Ok(())
}
}
pub fn fd(&self) -> fd_t { self.fd }
pub fn seek(&self, pos: i64, whence: SeekStyle) -> IoResult<u64> {
let whence = match whence {
SeekSet => libc::SEEK_SET,
SeekEnd => libc::SEEK_END,
SeekCur => libc::SEEK_CUR,
};
let n = unsafe { libc::lseek(self.fd(), pos as libc::off_t, whence) };
if n < 0 {
Err(super::last_error())
} else {
Ok(n as u64)
}
}
pub fn tell(&self) -> IoResult<u64> {
let n = unsafe { libc::lseek(self.fd(), 0, libc::SEEK_CUR) };
if n < 0 {
Err(super::last_error())
} else {
Ok(n as u64)
}
}
pub fn fsync(&self) -> IoResult<()> {
mkerr_libc(retry(|| unsafe { libc::fsync(self.fd()) }))
}
pub fn datasync(&self) -> IoResult<()> {
return mkerr_libc(os_datasync(self.fd()));
#[cfg(any(target_os = "macos", target_os = "ios"))]
fn os_datasync(fd: c_int) -> c_int {
unsafe { libc::fcntl(fd, libc::F_FULLFSYNC) }
}
#[cfg(target_os = "linux")]
fn os_datasync(fd: c_int) -> c_int {
retry(|| unsafe { libc::fdatasync(fd) })
}
#[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "linux")))]
fn os_datasync(fd: c_int) -> c_int {
retry(|| unsafe { libc::fsync(fd) })
}
}
pub fn truncate(&self, offset: i64) -> IoResult<()> {
mkerr_libc(retry(|| unsafe {
libc::ftruncate(self.fd(), offset as libc::off_t)
}))
}
pub fn fstat(&self) -> IoResult<FileStat> {
let mut stat: libc::stat = unsafe { mem::zeroed() };
match unsafe { libc::fstat(self.fd(), &mut stat) } {
0 => Ok(mkstat(&stat)),
_ => Err(super::last_error()),
}
}
pub fn unwrap(self) -> fd_t {
let fd = self.fd;
unsafe { mem::forget(self) };
fd
}
}
impl Drop for FileDesc {
fn drop(&mut self) {
if self.close_on_drop && self.fd > libc::STDERR_FILENO {
let n = unsafe { libc::close(self.fd) };
if n != 0 {
println!("error {} when closing file descriptor {}", n, self.fd);
}
}
}
}
pub fn open(path: &Path, fm: FileMode, fa: FileAccess) -> IoResult<FileDesc> {
let flags = match fm {
Open => 0,
Append => libc::O_APPEND,
Truncate => libc::O_TRUNC,
};
let (flags, mode) = match fa {
Read => (flags | libc::O_RDONLY, 0),
Write => (flags | libc::O_WRONLY | libc::O_CREAT,
libc::S_IRUSR | libc::S_IWUSR),
ReadWrite => (flags | libc::O_RDWR | libc::O_CREAT,
libc::S_IRUSR | libc::S_IWUSR),
};
let path = path.to_c_str();
match retry(|| unsafe { libc::open(path.as_ptr(), flags, mode) }) {
-1 => Err(super::last_error()),
fd => Ok(FileDesc::new(fd, true)),
}
}
pub fn mkdir(p: &Path, mode: uint) -> IoResult<()> {
let p = p.to_c_str();
mkerr_libc(unsafe { libc::mkdir(p.as_ptr(), mode as libc::mode_t) })
}
pub fn readdir(p: &Path) -> IoResult<Vec<Path>> {
use libc::{dirent_t};
use libc::{opendir, readdir_r, closedir};
fn prune(root: &CString, dirs: Vec<Path>) -> Vec<Path> {
let root = unsafe { CString::new(root.as_ptr(), false) };
let root = Path::new(root);
dirs.into_iter().filter(|path| {
path.as_vec() != b"." && path.as_vec() != b".."
}).map(|path| root.join(path)).collect()
}
extern {
fn rust_dirent_t_size() -> libc::c_int;
fn rust_list_dir_val(ptr: *mut dirent_t) -> *const libc::c_char;
}
let size = unsafe { rust_dirent_t_size() };
let mut buf = Vec::<u8>::with_capacity(size as uint);
let ptr = buf.as_mut_ptr() as *mut dirent_t;
let p = p.to_c_str();
let dir_ptr = unsafe {opendir(p.as_ptr())};
if dir_ptr as uint != 0 {
let mut paths = vec!();
let mut entry_ptr = 0 as *mut dirent_t;
while unsafe { readdir_r(dir_ptr, ptr, &mut entry_ptr) == 0 } {
if entry_ptr.is_null() { break }
let cstr = unsafe {
CString::new(rust_list_dir_val(entry_ptr), false)
};
paths.push(Path::new(cstr));
}
assert_eq!(unsafe { closedir(dir_ptr) }, 0);
Ok(prune(&p, paths))
} else {
Err(super::last_error())
}
}
pub fn unlink(p: &Path) -> IoResult<()> {
let p = p.to_c_str();
mkerr_libc(unsafe { libc::unlink(p.as_ptr()) })
}
pub fn rename(old: &Path, new: &Path) -> IoResult<()> {
let old = old.to_c_str();
let new = new.to_c_str();
mkerr_libc(unsafe {
libc::rename(old.as_ptr(), new.as_ptr())
})
}
pub fn chmod(p: &Path, mode: uint) -> IoResult<()> {
let p = p.to_c_str();
mkerr_libc(retry(|| unsafe {
libc::chmod(p.as_ptr(), mode as libc::mode_t)
}))
}
pub fn rmdir(p: &Path) -> IoResult<()> {
let p = p.to_c_str();
mkerr_libc(unsafe { libc::rmdir(p.as_ptr()) })
}
pub fn chown(p: &Path, uid: int, gid: int) -> IoResult<()> {
let p = p.to_c_str();
mkerr_libc(retry(|| unsafe {
libc::chown(p.as_ptr(), uid as libc::uid_t, gid as libc::gid_t)
}))
}
pub fn readlink(p: &Path) -> IoResult<Path> {
let c_path = p.to_c_str();
let p = c_path.as_ptr();
let mut len = unsafe { libc::pathconf(p as *mut _, libc::_PC_NAME_MAX) };
if len == -1 {
len = 1024;
}
let mut buf: Vec<u8> = Vec::with_capacity(len as uint);
match unsafe {
libc::readlink(p, buf.as_ptr() as *mut libc::c_char,
len as libc::size_t) as libc::c_int
} {
-1 => Err(super::last_error()),
n => {
assert!(n > 0);
unsafe { buf.set_len(n as uint); }
Ok(Path::new(buf))
}
}
}
pub fn symlink(src: &Path, dst: &Path) -> IoResult<()> {
let src = src.to_c_str();
let dst = dst.to_c_str();
mkerr_libc(unsafe { libc::symlink(src.as_ptr(), dst.as_ptr()) })
}
pub fn link(src: &Path, dst: &Path) -> IoResult<()> {
let src = src.to_c_str();
let dst = dst.to_c_str();
mkerr_libc(unsafe { libc::link(src.as_ptr(), dst.as_ptr()) })
}
fn mkstat(stat: &libc::stat) -> FileStat {
fn mktime(secs: u64, nsecs: u64) -> u64 { secs * 1000 + nsecs / 1000000 }
#[cfg(not(any(target_os = "linux", target_os = "android")))]
fn flags(stat: &libc::stat) -> u64 { stat.st_flags as u64 }
#[cfg(any(target_os = "linux", target_os = "android"))]
fn flags(_stat: &libc::stat) -> u64 { 0 }
#[cfg(not(any(target_os = "linux", target_os = "android")))]
fn gen(stat: &libc::stat) -> u64 { stat.st_gen as u64 }
#[cfg(any(target_os = "linux", target_os = "android"))]
fn gen(_stat: &libc::stat) -> u64 { 0 }
FileStat {
size: stat.st_size as u64,
kind: match (stat.st_mode as libc::mode_t) & libc::S_IFMT {
libc::S_IFREG => io::FileType::RegularFile,
libc::S_IFDIR => io::FileType::Directory,
libc::S_IFIFO => io::FileType::NamedPipe,
libc::S_IFBLK => io::FileType::BlockSpecial,
libc::S_IFLNK => io::FileType::Symlink,
_ => io::FileType::Unknown,
},
perm: FilePermission::from_bits_truncate(stat.st_mode as u32),
created: mktime(stat.st_ctime as u64, stat.st_ctime_nsec as u64),
modified: mktime(stat.st_mtime as u64, stat.st_mtime_nsec as u64),
accessed: mktime(stat.st_atime as u64, stat.st_atime_nsec as u64),
unstable: UnstableFileStat {
device: stat.st_dev as u64,
inode: stat.st_ino as u64,
rdev: stat.st_rdev as u64,
nlink: stat.st_nlink as u64,
uid: stat.st_uid as u64,
gid: stat.st_gid as u64,
blksize: stat.st_blksize as u64,
blocks: stat.st_blocks as u64,
flags: flags(stat),
gen: gen(stat),
},
}
}
pub fn stat(p: &Path) -> IoResult<FileStat> {
let p = p.to_c_str();
let mut stat: libc::stat = unsafe { mem::zeroed() };
match unsafe { libc::stat(p.as_ptr(), &mut stat) } {
0 => Ok(mkstat(&stat)),
_ => Err(super::last_error()),
}
}
pub fn lstat(p: &Path) -> IoResult<FileStat> {
let p = p.to_c_str();
let mut stat: libc::stat = unsafe { mem::zeroed() };
match unsafe { libc::lstat(p.as_ptr(), &mut stat) } {
0 => Ok(mkstat(&stat)),
_ => Err(super::last_error()),
}
}
pub fn utime(p: &Path, atime: u64, mtime: u64) -> IoResult<()> {
let p = p.to_c_str();
let buf = libc::utimbuf {
actime: (atime / 1000) as libc::time_t,
modtime: (mtime / 1000) as libc::time_t,
};
mkerr_libc(unsafe { libc::utime(p.as_ptr(), &buf) })
}
#[cfg(test)]
mod tests {
use super::FileDesc;
use libc;
use os;
use prelude::*;
#[cfg_attr(target_os = "freebsd", ignore)]
#[test]
fn test_file_desc() {
let os::Pipe { reader, writer } = unsafe { os::pipe().unwrap() };
let mut reader = FileDesc::new(reader, true);
let mut writer = FileDesc::new(writer, true);
writer.write(b"test").ok().unwrap();
let mut buf = [0u8, ..4];
match reader.read(&mut buf) {
Ok(4) => {
assert_eq!(buf[0], 't' as u8);
assert_eq!(buf[1], 'e' as u8);
assert_eq!(buf[2], 's' as u8);
assert_eq!(buf[3], 't' as u8);
}
r => panic!("invalid read: {}", r),
}
assert!(writer.read(&mut buf).is_err());
assert!(reader.write(&buf).is_err());
}
}