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/// Performs a syscall and returns a `Result<usize, Errno>`.
///
/// Accepts a syscall number and a variable number of arguments (0 to 6).
///
/// # Returns
/// - `Ok` on success, or
/// - `Err(errno)` if the syscall failed.
///
/// # Example
/// ```
/// use syscalls::{Sysno, syscall};
///
/// match unsafe { syscall!(Sysno::clone) } {
/// Ok(0) => {
/// // Child process
/// }
/// Ok(pid) => {
/// // Parent process
/// }
/// Err(err) => {
/// eprintln!("clone() failed: {}", err);
/// }
/// }
/// ```
#[macro_export]
macro_rules! syscall {
($nr:expr) => {
$crate::syscall0($nr)
};
($nr:expr, $a1:expr) => {
$crate::syscall1($nr, $a1 as usize)
};
($nr:expr, $a1:expr, $a2:expr) => {
$crate::syscall2($nr, $a1 as usize, $a2 as usize)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr) => {
$crate::syscall3($nr, $a1 as usize, $a2 as usize, $a3 as usize)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
$crate::syscall4(
$nr,
$a1 as usize,
$a2 as usize,
$a3 as usize,
$a4 as usize,
)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
$crate::syscall5(
$nr,
$a1 as usize,
$a2 as usize,
$a3 as usize,
$a4 as usize,
$a5 as usize,
)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
$crate::syscall6(
$nr,
$a1 as usize,
$a2 as usize,
$a3 as usize,
$a4 as usize,
$a5 as usize,
$a6 as usize,
)
};
}
/// Performs a raw syscall and returns a `usize`. Use [`syscall`] if you wish to
/// get a `Result` as a return value.
///
/// Accepts a syscall number and a variable number of arguments (0 to 6).
///
/// # Example
/// ```
/// use syscalls::{Sysno, raw_syscall};
///
/// // gettid is guaranteed to never fail, so we don't need a `Result` return
/// // value.
/// let tid = unsafe { raw_syscall!(Sysno::gettid) };
/// println!("My thread ID is {}", tid);
/// ```
#[macro_export]
macro_rules! raw_syscall {
($nr:expr) => {
$crate::raw::syscall0($nr)
};
($nr:expr, $a1:expr) => {
$crate::raw::syscall1($nr, $a1 as usize)
};
($nr:expr, $a1:expr, $a2:expr) => {
$crate::raw::syscall2($nr, $a1 as usize, $a2 as usize)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr) => {
$crate::raw::syscall3($nr, $a1 as usize, $a2 as usize, $a3 as usize)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => {
$crate::raw::syscall4(
$nr,
$a1 as usize,
$a2 as usize,
$a3 as usize,
$a4 as usize,
)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => {
$crate::raw::syscall5(
$nr,
$a1 as usize,
$a2 as usize,
$a3 as usize,
$a4 as usize,
$a5 as usize,
)
};
($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => {
$crate::raw::syscall6(
$nr,
$a1 as usize,
$a2 as usize,
$a3 as usize,
$a4 as usize,
$a5 as usize,
$a6 as usize,
)
};
}