use crate::os::unix::prelude::*;
use crate::collections::BTreeMap;
use crate::ffi::{CStr, CString, OsStr, OsString};
use crate::fmt;
use crate::io;
use crate::ptr;
use crate::sys::fd::FileDesc;
use crate::sys::fs::File;
use crate::sys::pipe::{self, AnonPipe};
use crate::sys_common::process::CommandEnv;
#[cfg(not(target_os = "fuchsia"))]
use crate::sys::fs::OpenOptions;
use libc::{c_char, c_int, gid_t, uid_t, EXIT_FAILURE, EXIT_SUCCESS};
cfg_if::cfg_if! {
    if #[cfg(target_os = "fuchsia")] {
        
    } else if #[cfg(target_os = "redox")] {
        const DEV_NULL: &str = "null:\0";
    } else {
        const DEV_NULL: &str = "/dev/null\0";
    }
}
cfg_if::cfg_if! {
    if #[cfg(target_os = "android")] {
        pub unsafe fn sigemptyset(set: *mut libc::sigset_t) -> libc::c_int {
            set.write_bytes(0u8, 1);
            return 0;
        }
        #[allow(dead_code)]
        pub unsafe fn sigaddset(set: *mut libc::sigset_t, signum: libc::c_int) -> libc::c_int {
            use crate::{slice, mem};
            let raw = slice::from_raw_parts_mut(set as *mut u8, mem::size_of::<libc::sigset_t>());
            let bit = (signum - 1) as usize;
            raw[bit / 8] |= 1 << (bit % 8);
            return 0;
        }
    } else {
        pub use libc::{sigemptyset, sigaddset};
    }
}
pub struct Command {
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    program: CString,
    args: Vec<CString>,
    argv: Argv,
    env: CommandEnv,
    cwd: Option<CString>,
    uid: Option<uid_t>,
    gid: Option<gid_t>,
    saw_nul: bool,
    closures: Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>>,
    stdin: Option<Stdio>,
    stdout: Option<Stdio>,
    stderr: Option<Stdio>,
}
struct Argv(Vec<*const c_char>);
unsafe impl Send for Argv {}
pub struct StdioPipes {
    pub stdin: Option<AnonPipe>,
    pub stdout: Option<AnonPipe>,
    pub stderr: Option<AnonPipe>,
}
pub struct ChildPipes {
    pub stdin: ChildStdio,
    pub stdout: ChildStdio,
    pub stderr: ChildStdio,
}
pub enum ChildStdio {
    Inherit,
    Explicit(c_int),
    Owned(FileDesc),
    
    
    #[cfg(target_os = "fuchsia")]
    Null,
}
pub enum Stdio {
    Inherit,
    Null,
    MakePipe,
    Fd(FileDesc),
}
impl Command {
    pub fn new(program: &OsStr) -> Command {
        let mut saw_nul = false;
        let program = os2c(program, &mut saw_nul);
        Command {
            argv: Argv(vec![program.as_ptr(), ptr::null()]),
            args: vec![program.clone()],
            program,
            env: Default::default(),
            cwd: None,
            uid: None,
            gid: None,
            saw_nul,
            closures: Vec::new(),
            stdin: None,
            stdout: None,
            stderr: None,
        }
    }
    pub fn set_arg_0(&mut self, arg: &OsStr) {
        
        let arg = os2c(arg, &mut self.saw_nul);
        debug_assert!(self.argv.0.len() > 1);
        self.argv.0[0] = arg.as_ptr();
        self.args[0] = arg;
    }
    pub fn arg(&mut self, arg: &OsStr) {
        
        
        let arg = os2c(arg, &mut self.saw_nul);
        self.argv.0[self.args.len()] = arg.as_ptr();
        self.argv.0.push(ptr::null());
        
        
        self.args.push(arg);
    }
    pub fn cwd(&mut self, dir: &OsStr) {
        self.cwd = Some(os2c(dir, &mut self.saw_nul));
    }
    pub fn uid(&mut self, id: uid_t) {
        self.uid = Some(id);
    }
    pub fn gid(&mut self, id: gid_t) {
        self.gid = Some(id);
    }
    pub fn saw_nul(&self) -> bool {
        self.saw_nul
    }
    pub fn get_argv(&self) -> &Vec<*const c_char> {
        &self.argv.0
    }
    pub fn get_program(&self) -> &CStr {
        &*self.program
    }
    #[allow(dead_code)]
    pub fn get_cwd(&self) -> &Option<CString> {
        &self.cwd
    }
    #[allow(dead_code)]
    pub fn get_uid(&self) -> Option<uid_t> {
        self.uid
    }
    #[allow(dead_code)]
    pub fn get_gid(&self) -> Option<gid_t> {
        self.gid
    }
    pub fn get_closures(&mut self) -> &mut Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>> {
        &mut self.closures
    }
    pub unsafe fn pre_exec(&mut self, f: Box<dyn FnMut() -> io::Result<()> + Send + Sync>) {
        self.closures.push(f);
    }
    pub fn stdin(&mut self, stdin: Stdio) {
        self.stdin = Some(stdin);
    }
    pub fn stdout(&mut self, stdout: Stdio) {
        self.stdout = Some(stdout);
    }
    pub fn stderr(&mut self, stderr: Stdio) {
        self.stderr = Some(stderr);
    }
    pub fn env_mut(&mut self) -> &mut CommandEnv {
        &mut self.env
    }
    pub fn capture_env(&mut self) -> Option<CStringArray> {
        let maybe_env = self.env.capture_if_changed();
        maybe_env.map(|env| construct_envp(env, &mut self.saw_nul))
    }
    #[allow(dead_code)]
    pub fn env_saw_path(&self) -> bool {
        self.env.have_changed_path()
    }
    pub fn setup_io(
        &self,
        default: Stdio,
        needs_stdin: bool,
    ) -> io::Result<(StdioPipes, ChildPipes)> {
        let null = Stdio::Null;
        let default_stdin = if needs_stdin { &default } else { &null };
        let stdin = self.stdin.as_ref().unwrap_or(default_stdin);
        let stdout = self.stdout.as_ref().unwrap_or(&default);
        let stderr = self.stderr.as_ref().unwrap_or(&default);
        let (their_stdin, our_stdin) = stdin.to_child_stdio(true)?;
        let (their_stdout, our_stdout) = stdout.to_child_stdio(false)?;
        let (their_stderr, our_stderr) = stderr.to_child_stdio(false)?;
        let ours = StdioPipes { stdin: our_stdin, stdout: our_stdout, stderr: our_stderr };
        let theirs = ChildPipes { stdin: their_stdin, stdout: their_stdout, stderr: their_stderr };
        Ok((ours, theirs))
    }
}
fn os2c(s: &OsStr, saw_nul: &mut bool) -> CString {
    CString::new(s.as_bytes()).unwrap_or_else(|_e| {
        *saw_nul = true;
        CString::new("<string-with-nul>").unwrap()
    })
}
pub struct CStringArray {
    items: Vec<CString>,
    ptrs: Vec<*const c_char>,
}
impl CStringArray {
    pub fn with_capacity(capacity: usize) -> Self {
        let mut result = CStringArray {
            items: Vec::with_capacity(capacity),
            ptrs: Vec::with_capacity(capacity + 1),
        };
        result.ptrs.push(ptr::null());
        result
    }
    pub fn push(&mut self, item: CString) {
        let l = self.ptrs.len();
        self.ptrs[l - 1] = item.as_ptr();
        self.ptrs.push(ptr::null());
        self.items.push(item);
    }
    pub fn as_ptr(&self) -> *const *const c_char {
        self.ptrs.as_ptr()
    }
}
fn construct_envp(env: BTreeMap<OsString, OsString>, saw_nul: &mut bool) -> CStringArray {
    let mut result = CStringArray::with_capacity(env.len());
    for (mut k, v) in env {
        
        k.reserve_exact(v.len() + 2);
        k.push("=");
        k.push(&v);
        
        if let Ok(item) = CString::new(k.into_vec()) {
            result.push(item);
        } else {
            *saw_nul = true;
        }
    }
    result
}
impl Stdio {
    pub fn to_child_stdio(&self, readable: bool) -> io::Result<(ChildStdio, Option<AnonPipe>)> {
        match *self {
            Stdio::Inherit => Ok((ChildStdio::Inherit, None)),
            
            
            
            
            
            
            
            Stdio::Fd(ref fd) => {
                if fd.raw() >= 0 && fd.raw() <= libc::STDERR_FILENO {
                    Ok((ChildStdio::Owned(fd.duplicate()?), None))
                } else {
                    Ok((ChildStdio::Explicit(fd.raw()), None))
                }
            }
            Stdio::MakePipe => {
                let (reader, writer) = pipe::anon_pipe()?;
                let (ours, theirs) = if readable { (writer, reader) } else { (reader, writer) };
                Ok((ChildStdio::Owned(theirs.into_fd()), Some(ours)))
            }
            #[cfg(not(target_os = "fuchsia"))]
            Stdio::Null => {
                let mut opts = OpenOptions::new();
                opts.read(readable);
                opts.write(!readable);
                let path = unsafe { CStr::from_ptr(DEV_NULL.as_ptr() as *const _) };
                let fd = File::open_c(&path, &opts)?;
                Ok((ChildStdio::Owned(fd.into_fd()), None))
            }
            #[cfg(target_os = "fuchsia")]
            Stdio::Null => Ok((ChildStdio::Null, None)),
        }
    }
}
impl From<AnonPipe> for Stdio {
    fn from(pipe: AnonPipe) -> Stdio {
        Stdio::Fd(pipe.into_fd())
    }
}
impl From<File> for Stdio {
    fn from(file: File) -> Stdio {
        Stdio::Fd(file.into_fd())
    }
}
impl ChildStdio {
    pub fn fd(&self) -> Option<c_int> {
        match *self {
            ChildStdio::Inherit => None,
            ChildStdio::Explicit(fd) => Some(fd),
            ChildStdio::Owned(ref fd) => Some(fd.raw()),
            #[cfg(target_os = "fuchsia")]
            ChildStdio::Null => None,
        }
    }
}
impl fmt::Debug for Command {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if self.program != self.args[0] {
            write!(f, "[{:?}] ", self.program)?;
        }
        write!(f, "{:?}", self.args[0])?;
        for arg in &self.args[1..] {
            write!(f, " {:?}", arg)?;
        }
        Ok(())
    }
}
#[derive(PartialEq, Eq, Clone, Copy, Debug)]
pub struct ExitCode(u8);
impl ExitCode {
    pub const SUCCESS: ExitCode = ExitCode(EXIT_SUCCESS as _);
    pub const FAILURE: ExitCode = ExitCode(EXIT_FAILURE as _);
    #[inline]
    pub fn as_i32(&self) -> i32 {
        self.0 as i32
    }
}
#[cfg(all(test, not(target_os = "emscripten")))]
mod tests {
    use super::*;
    use crate::ffi::OsStr;
    use crate::mem;
    use crate::ptr;
    use crate::sys::cvt;
    macro_rules! t {
        ($e:expr) => {
            match $e {
                Ok(t) => t,
                Err(e) => panic!("received error for `{}`: {}", stringify!($e), e),
            }
        };
    }
    
    
    
    #[test]
    #[cfg_attr(target_os = "macos", ignore)]
    
    
    
    #[cfg_attr(target_arch = "arm", ignore)]
    #[cfg_attr(target_arch = "aarch64", ignore)]
    fn test_process_mask() {
        unsafe {
            
            let mut cmd = Command::new(OsStr::new("cat"));
            let mut set = mem::MaybeUninit::<libc::sigset_t>::uninit();
            let mut old_set = mem::MaybeUninit::<libc::sigset_t>::uninit();
            t!(cvt(sigemptyset(set.as_mut_ptr())));
            t!(cvt(sigaddset(set.as_mut_ptr(), libc::SIGINT)));
            t!(cvt(libc::pthread_sigmask(libc::SIG_SETMASK, set.as_ptr(), old_set.as_mut_ptr())));
            cmd.stdin(Stdio::MakePipe);
            cmd.stdout(Stdio::MakePipe);
            let (mut cat, mut pipes) = t!(cmd.spawn(Stdio::Null, true));
            let stdin_write = pipes.stdin.take().unwrap();
            let stdout_read = pipes.stdout.take().unwrap();
            t!(cvt(libc::pthread_sigmask(libc::SIG_SETMASK, old_set.as_ptr(), ptr::null_mut())));
            t!(cvt(libc::kill(cat.id() as libc::pid_t, libc::SIGINT)));
            
            
            
            
            let _ = stdin_write.write(b"Hello");
            drop(stdin_write);
            
            let mut buf = [0; 5];
            if let Ok(ret) = stdout_read.read(&mut buf) {
                assert_eq!(ret, 0);
            }
            t!(cat.wait());
        }
    }
}