nix/sys/ioctl/
linux.rs

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1use cfg_if::cfg_if;
2
3/// The datatype used for the ioctl number
4#[cfg(any(target_os = "android", target_env = "musl"))]
5#[doc(hidden)]
6pub type ioctl_num_type = ::libc::c_int;
7#[cfg(not(any(target_os = "android", target_env = "musl")))]
8#[doc(hidden)]
9pub type ioctl_num_type = ::libc::c_ulong;
10/// The datatype used for the 3rd argument
11#[doc(hidden)]
12pub type ioctl_param_type = ::libc::c_ulong;
13
14#[doc(hidden)]
15pub const NRBITS: ioctl_num_type = 8;
16#[doc(hidden)]
17pub const TYPEBITS: ioctl_num_type = 8;
18
19cfg_if! {
20    if #[cfg(any(
21        target_arch = "mips",
22        target_arch = "mips32r6",
23        target_arch = "mips64",
24        target_arch = "mips64r6",
25        target_arch = "powerpc",
26        target_arch = "powerpc64",
27        target_arch = "sparc64"
28    ))] {
29        mod consts {
30            #[doc(hidden)]
31            pub const NONE: u8 = 1;
32            #[doc(hidden)]
33            pub const READ: u8 = 2;
34            #[doc(hidden)]
35            pub const WRITE: u8 = 4;
36            #[doc(hidden)]
37            pub const SIZEBITS: u8 = 13;
38            #[doc(hidden)]
39            pub const DIRBITS: u8 = 3;
40        }
41    } else {
42        // "Generic" ioctl protocol
43        mod consts {
44            #[doc(hidden)]
45            pub const NONE: u8 = 0;
46            #[doc(hidden)]
47            pub const READ: u8 = 2;
48            #[doc(hidden)]
49            pub const WRITE: u8 = 1;
50            #[doc(hidden)]
51            pub const SIZEBITS: u8 = 14;
52            #[doc(hidden)]
53            pub const DIRBITS: u8 = 2;
54        }
55    }
56}
57
58pub use self::consts::*;
59
60#[doc(hidden)]
61pub const NRSHIFT: ioctl_num_type = 0;
62#[doc(hidden)]
63pub const TYPESHIFT: ioctl_num_type = NRSHIFT + NRBITS as ioctl_num_type;
64#[doc(hidden)]
65pub const SIZESHIFT: ioctl_num_type = TYPESHIFT + TYPEBITS as ioctl_num_type;
66#[doc(hidden)]
67pub const DIRSHIFT: ioctl_num_type = SIZESHIFT + SIZEBITS as ioctl_num_type;
68
69#[doc(hidden)]
70pub const NRMASK: ioctl_num_type = (1 << NRBITS) - 1;
71#[doc(hidden)]
72pub const TYPEMASK: ioctl_num_type = (1 << TYPEBITS) - 1;
73#[doc(hidden)]
74pub const SIZEMASK: ioctl_num_type = (1 << SIZEBITS) - 1;
75#[doc(hidden)]
76pub const DIRMASK: ioctl_num_type = (1 << DIRBITS) - 1;
77
78/// Encode an ioctl command.
79#[macro_export]
80#[doc(hidden)]
81macro_rules! ioc {
82    ($dir:expr, $ty:expr, $nr:expr, $sz:expr) => {
83        (($dir as $crate::sys::ioctl::ioctl_num_type
84            & $crate::sys::ioctl::DIRMASK)
85            << $crate::sys::ioctl::DIRSHIFT)
86            | (($ty as $crate::sys::ioctl::ioctl_num_type
87                & $crate::sys::ioctl::TYPEMASK)
88                << $crate::sys::ioctl::TYPESHIFT)
89            | (($nr as $crate::sys::ioctl::ioctl_num_type
90                & $crate::sys::ioctl::NRMASK)
91                << $crate::sys::ioctl::NRSHIFT)
92            | (($sz as $crate::sys::ioctl::ioctl_num_type
93                & $crate::sys::ioctl::SIZEMASK)
94                << $crate::sys::ioctl::SIZESHIFT)
95    };
96}
97
98/// Generate an ioctl request code for a command that passes no data.
99///
100/// This is equivalent to the `_IO()` macro exposed by the C ioctl API.
101///
102/// You should only use this macro directly if the `ioctl` you're working
103/// with is "bad" and you cannot use `ioctl_none!()` directly.
104///
105/// # Example
106///
107/// ```
108/// # #[macro_use] extern crate nix;
109/// const KVMIO: u8 = 0xAE;
110/// ioctl_write_int_bad!(kvm_create_vm, request_code_none!(KVMIO, 0x03));
111/// # fn main() {}
112/// ```
113#[macro_export(local_inner_macros)]
114macro_rules! request_code_none {
115    ($ty:expr, $nr:expr) => {
116        ioc!($crate::sys::ioctl::NONE, $ty, $nr, 0)
117    };
118}
119
120/// Generate an ioctl request code for a command that reads.
121///
122/// This is equivalent to the `_IOR()` macro exposed by the C ioctl API.
123///
124/// You should only use this macro directly if the `ioctl` you're working
125/// with is "bad" and you cannot use `ioctl_read!()` directly.
126///
127/// The read/write direction is relative to userland, so this
128/// command would be userland is reading and the kernel is
129/// writing.
130#[macro_export(local_inner_macros)]
131macro_rules! request_code_read {
132    ($ty:expr, $nr:expr, $sz:expr) => {
133        ioc!($crate::sys::ioctl::READ, $ty, $nr, $sz)
134    };
135}
136
137/// Generate an ioctl request code for a command that writes.
138///
139/// This is equivalent to the `_IOW()` macro exposed by the C ioctl API.
140///
141/// You should only use this macro directly if the `ioctl` you're working
142/// with is "bad" and you cannot use `ioctl_write!()` directly.
143///
144/// The read/write direction is relative to userland, so this
145/// command would be userland is writing and the kernel is
146/// reading.
147#[macro_export(local_inner_macros)]
148macro_rules! request_code_write {
149    ($ty:expr, $nr:expr, $sz:expr) => {
150        ioc!($crate::sys::ioctl::WRITE, $ty, $nr, $sz)
151    };
152}
153
154/// Generate an ioctl request code for a command that reads and writes.
155///
156/// This is equivalent to the `_IOWR()` macro exposed by the C ioctl API.
157///
158/// You should only use this macro directly if the `ioctl` you're working
159/// with is "bad" and you cannot use `ioctl_readwrite!()` directly.
160#[macro_export(local_inner_macros)]
161macro_rules! request_code_readwrite {
162    ($ty:expr, $nr:expr, $sz:expr) => {
163        ioc!(
164            $crate::sys::ioctl::READ | $crate::sys::ioctl::WRITE,
165            $ty,
166            $nr,
167            $sz
168        )
169    };
170}
nix/sys/ioctl/linux.rs

nix/sys/ioctl/
linux.rs
