nix 0.31.2

Rust friendly bindings to *nix APIs
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180

use cfg_if::cfg_if;

/// The datatype used for the ioctl number
#[cfg(any(
    target_os = "android",
    target_os = "fuchsia",
    target_env = "musl",
    target_env = "ohos"
))]
#[doc(hidden)]
pub type ioctl_num_type = ::libc::c_int;
#[cfg(not(any(
    target_os = "android",
    target_os = "fuchsia",
    target_env = "musl",
    target_env = "ohos"
)))]
#[doc(hidden)]
pub type ioctl_num_type = ::libc::c_ulong;
/// The datatype used for the 3rd argument
#[doc(hidden)]
pub type ioctl_param_type = ::libc::c_ulong;

#[doc(hidden)]
pub const NRBITS: ioctl_num_type = 8;
#[doc(hidden)]
pub const TYPEBITS: ioctl_num_type = 8;

cfg_if! {
    if #[cfg(any(
        target_arch = "mips",
        target_arch = "mips32r6",
        target_arch = "mips64",
        target_arch = "mips64r6",
        target_arch = "powerpc",
        target_arch = "powerpc64",
        target_arch = "sparc64"
    ))] {
        mod consts {
            #[doc(hidden)]
            pub const NONE: u8 = 1;
            #[doc(hidden)]
            pub const READ: u8 = 2;
            #[doc(hidden)]
            pub const WRITE: u8 = 4;
            #[doc(hidden)]
            pub const SIZEBITS: u8 = 13;
            #[doc(hidden)]
            pub const DIRBITS: u8 = 3;
        }
    } else {
        // "Generic" ioctl protocol
        mod consts {
            #[doc(hidden)]
            pub const NONE: u8 = 0;
            #[doc(hidden)]
            pub const READ: u8 = 2;
            #[doc(hidden)]
            pub const WRITE: u8 = 1;
            #[doc(hidden)]
            pub const SIZEBITS: u8 = 14;
            #[doc(hidden)]
            pub const DIRBITS: u8 = 2;
        }
    }
}

pub use self::consts::*;

#[doc(hidden)]
pub const NRSHIFT: ioctl_num_type = 0;
#[doc(hidden)]
pub const TYPESHIFT: ioctl_num_type = NRSHIFT + NRBITS as ioctl_num_type;
#[doc(hidden)]
pub const SIZESHIFT: ioctl_num_type = TYPESHIFT + TYPEBITS as ioctl_num_type;
#[doc(hidden)]
pub const DIRSHIFT: ioctl_num_type = SIZESHIFT + SIZEBITS as ioctl_num_type;

#[doc(hidden)]
pub const NRMASK: ioctl_num_type = (1 << NRBITS) - 1;
#[doc(hidden)]
pub const TYPEMASK: ioctl_num_type = (1 << TYPEBITS) - 1;
#[doc(hidden)]
pub const SIZEMASK: ioctl_num_type = (1 << SIZEBITS) - 1;
#[doc(hidden)]
pub const DIRMASK: ioctl_num_type = (1 << DIRBITS) - 1;

/// Encode an ioctl command.
#[macro_export]
#[doc(hidden)]
macro_rules! ioc {
    ($dir:expr, $ty:expr, $nr:expr, $sz:expr) => {
        (($dir as $crate::sys::ioctl::ioctl_num_type
            & $crate::sys::ioctl::DIRMASK)
            << $crate::sys::ioctl::DIRSHIFT)
            | (($ty as $crate::sys::ioctl::ioctl_num_type
                & $crate::sys::ioctl::TYPEMASK)
                << $crate::sys::ioctl::TYPESHIFT)
            | (($nr as $crate::sys::ioctl::ioctl_num_type
                & $crate::sys::ioctl::NRMASK)
                << $crate::sys::ioctl::NRSHIFT)
            | (($sz as $crate::sys::ioctl::ioctl_num_type
                & $crate::sys::ioctl::SIZEMASK)
                << $crate::sys::ioctl::SIZESHIFT)
    };
}

/// Generate an ioctl request code for a command that passes no data.
///
/// This is equivalent to the `_IO()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_none!()` directly.
///
/// # Example
///
/// ```
/// # #[macro_use] extern crate nix;
/// const KVMIO: u8 = 0xAE;
/// ioctl_write_int_bad!(kvm_create_vm, request_code_none!(KVMIO, 0x03));
/// # fn main() {}
/// ```
#[macro_export(local_inner_macros)]
macro_rules! request_code_none {
    ($ty:expr, $nr:expr) => {
        ioc!($crate::sys::ioctl::NONE, $ty, $nr, 0)
    };
}

/// Generate an ioctl request code for a command that reads.
///
/// This is equivalent to the `_IOR()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_read!()` directly.
///
/// The read/write direction is relative to userland, so this
/// command would be userland is reading and the kernel is
/// writing.
#[macro_export(local_inner_macros)]
macro_rules! request_code_read {
    ($ty:expr, $nr:expr, $sz:expr) => {
        ioc!($crate::sys::ioctl::READ, $ty, $nr, $sz)
    };
}

/// Generate an ioctl request code for a command that writes.
///
/// This is equivalent to the `_IOW()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_write!()` directly.
///
/// The read/write direction is relative to userland, so this
/// command would be userland is writing and the kernel is
/// reading.
#[macro_export(local_inner_macros)]
macro_rules! request_code_write {
    ($ty:expr, $nr:expr, $sz:expr) => {
        ioc!($crate::sys::ioctl::WRITE, $ty, $nr, $sz)
    };
}

/// Generate an ioctl request code for a command that reads and writes.
///
/// This is equivalent to the `_IOWR()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_readwrite!()` directly.
#[macro_export(local_inner_macros)]
macro_rules! request_code_readwrite {
    ($ty:expr, $nr:expr, $sz:expr) => {
        ioc!(
            $crate::sys::ioctl::READ | $crate::sys::ioctl::WRITE,
            $ty,
            $nr,
            $sz
        )
    };
}