/rust/registry/src/index.crates.io-6f17d22bba15001f/nix-0.26.2/src/features.rs
Line | Count | Source (jump to first uncovered line) |
1 | | //! Feature tests for OS functionality |
2 | | pub use self::os::*; |
3 | | |
4 | | #[cfg(any(target_os = "linux", target_os = "android"))] |
5 | | mod os { |
6 | | use crate::sys::utsname::uname; |
7 | | use crate::Result; |
8 | | use std::os::unix::ffi::OsStrExt; |
9 | | |
10 | | // Features: |
11 | | // * atomic cloexec on socket: 2.6.27 |
12 | | // * pipe2: 2.6.27 |
13 | | // * accept4: 2.6.28 |
14 | | |
15 | | static VERS_UNKNOWN: usize = 1; |
16 | | static VERS_2_6_18: usize = 2; |
17 | | static VERS_2_6_27: usize = 3; |
18 | | static VERS_2_6_28: usize = 4; |
19 | | static VERS_3: usize = 5; |
20 | | |
21 | | #[inline] |
22 | 0 | fn digit(dst: &mut usize, b: u8) { |
23 | 0 | *dst *= 10; |
24 | 0 | *dst += (b - b'0') as usize; |
25 | 0 | } |
26 | | |
27 | 0 | fn parse_kernel_version() -> Result<usize> { |
28 | 0 | let u = uname()?; |
29 | | |
30 | 0 | let mut curr: usize = 0; |
31 | 0 | let mut major: usize = 0; |
32 | 0 | let mut minor: usize = 0; |
33 | 0 | let mut patch: usize = 0; |
34 | | |
35 | 0 | for &b in u.release().as_bytes() { |
36 | 0 | if curr >= 3 { |
37 | 0 | break; |
38 | 0 | } |
39 | 0 |
|
40 | 0 | match b { |
41 | 0 | b'.' | b'-' => { |
42 | 0 | curr += 1; |
43 | 0 | } |
44 | 0 | b'0'..=b'9' => match curr { |
45 | 0 | 0 => digit(&mut major, b), |
46 | 0 | 1 => digit(&mut minor, b), |
47 | 0 | _ => digit(&mut patch, b), |
48 | | }, |
49 | 0 | _ => break, |
50 | | } |
51 | | } |
52 | | |
53 | 0 | Ok(if major >= 3 { |
54 | 0 | VERS_3 |
55 | 0 | } else if major >= 2 { |
56 | 0 | if minor >= 7 { |
57 | 0 | VERS_UNKNOWN |
58 | 0 | } else if minor >= 6 { |
59 | 0 | if patch >= 28 { |
60 | 0 | VERS_2_6_28 |
61 | 0 | } else if patch >= 27 { |
62 | 0 | VERS_2_6_27 |
63 | | } else { |
64 | 0 | VERS_2_6_18 |
65 | | } |
66 | | } else { |
67 | 0 | VERS_UNKNOWN |
68 | | } |
69 | | } else { |
70 | 0 | VERS_UNKNOWN |
71 | | }) |
72 | 0 | } |
73 | | |
74 | 0 | fn kernel_version() -> Result<usize> { |
75 | 0 | static mut KERNEL_VERS: usize = 0; |
76 | 0 |
|
77 | 0 | unsafe { |
78 | 0 | if KERNEL_VERS == 0 { |
79 | 0 | KERNEL_VERS = parse_kernel_version()?; |
80 | 0 | } |
81 | | |
82 | 0 | Ok(KERNEL_VERS) |
83 | | } |
84 | 0 | } |
85 | | |
86 | | /// Check if the OS supports atomic close-on-exec for sockets |
87 | 0 | pub fn socket_atomic_cloexec() -> bool { |
88 | 0 | kernel_version() |
89 | 0 | .map(|version| version >= VERS_2_6_27) |
90 | 0 | .unwrap_or(false) |
91 | 0 | } |
92 | | |
93 | | #[test] |
94 | | pub fn test_parsing_kernel_version() { |
95 | | assert!(kernel_version().unwrap() > 0); |
96 | | } |
97 | | } |
98 | | |
99 | | #[cfg(any( |
100 | | target_os = "dragonfly", // Since ??? |
101 | | target_os = "freebsd", // Since 10.0 |
102 | | target_os = "illumos", // Since ??? |
103 | | target_os = "netbsd", // Since 6.0 |
104 | | target_os = "openbsd", // Since 5.7 |
105 | | target_os = "redox", // Since 1-july-2020 |
106 | | ))] |
107 | | mod os { |
108 | | /// Check if the OS supports atomic close-on-exec for sockets |
109 | | pub const fn socket_atomic_cloexec() -> bool { |
110 | | true |
111 | | } |
112 | | } |
113 | | |
114 | | #[cfg(any( |
115 | | target_os = "macos", |
116 | | target_os = "ios", |
117 | | target_os = "fuchsia", |
118 | | target_os = "haiku", |
119 | | target_os = "solaris" |
120 | | ))] |
121 | | mod os { |
122 | | /// Check if the OS supports atomic close-on-exec for sockets |
123 | | pub const fn socket_atomic_cloexec() -> bool { |
124 | | false |
125 | | } |
126 | | } |