sysctl/linux/
ctl.rs

Help
1// linux/ctl.rs
2
3use super::funcs::{path_to_name, set_value, value};
4use consts::*;
5use ctl_error::SysctlError;
6use ctl_flags::CtlFlags;
7use ctl_info::CtlInfo;
8use ctl_type::CtlType;
9use ctl_value::CtlValue;
10use std::str::FromStr;
11use traits::Sysctl;
12
13/// This struct represents a system control.
14#[derive(Debug, Clone, PartialEq)]
15pub struct Ctl {
16    name: String,
17}
18
19impl FromStr for Ctl {
20    type Err = SysctlError;
21
22    fn from_str(name: &str) -> Result<Self, Self::Err> {
23        let ctl = Ctl {
24            name: path_to_name(name),
25        };
26        let _ =
27            std::fs::File::open(ctl.path()).map_err(|_| SysctlError::NotFound(name.to_owned()))?;
28        Ok(ctl)
29    }
30}
31
32impl Ctl {
33    pub fn path(&self) -> String {
34        format!("/proc/sys/{}", self.name.replace(".", "/"))
35    }
36}
37
38impl Sysctl for Ctl {
39    fn new(name: &str) -> Result<Self, SysctlError> {
40        Ctl::from_str(name)
41    }
42
43    fn new_with_type(name: &str, _ctl_type: CtlType, _fmt: &str) -> Result<Self, SysctlError> {
44        Ctl::from_str(name)
45    }
46
47    fn name(&self) -> Result<String, SysctlError> {
48        Ok(self.name.clone())
49    }
50
51    fn value_type(&self) -> Result<CtlType, SysctlError> {
52        let md = std::fs::metadata(&self.path()).map_err(SysctlError::IoError)?;
53        if md.is_dir() {
54            Ok(CtlType::Node)
55        } else {
56            Ok(CtlType::String)
57        }
58    }
59
60    fn description(&self) -> Result<String, SysctlError> {
61        Ok("[N/A]".to_owned())
62    }
63
64    fn value(&self) -> Result<CtlValue, SysctlError> {
65        value(&self.path())
66    }
67
68    fn value_string(&self) -> Result<String, SysctlError> {
69        self.value().map(|v| format!("{}", v))
70    }
71
72    fn value_as<T>(&self) -> Result<Box<T>, SysctlError> {
73        Err(SysctlError::NotSupported)
74    }
75
76    fn set_value(&self, value: CtlValue) -> Result<CtlValue, SysctlError> {
77        set_value(&self.path(), value)
78    }
79
80    fn set_value_string(&self, value: &str) -> Result<String, SysctlError> {
81        self.set_value(CtlValue::String(value.to_owned()))?;
82        self.value_string()
83    }
84
85    fn flags(&self) -> Result<CtlFlags, SysctlError> {
86        Ok(self.info()?.flags())
87    }
88
89    fn info(&self) -> Result<CtlInfo, SysctlError> {
90        let md = std::fs::metadata(&self.path()).map_err(SysctlError::IoError)?;
91        let mut flags = 0;
92        if md.permissions().readonly() {
93            flags |= CTLFLAG_RD;
94        } else {
95            flags |= CTLFLAG_RW;
96        }
97        let s = CtlInfo {
98            ctl_type: CtlType::String,
99            fmt: "".to_owned(),
100            flags: flags,
101        };
102        Ok(s)
103    }
104}
105
106#[cfg(test)]
107mod tests {
108    use crate::Sysctl;
109
110    #[test]
111    fn ctl_new() {
112        let _ = super::Ctl::new("kernel.ostype").expect("Ctl::new");
113    }
114}
sysctl/linux/ctl.rs

sysctl/linux/
ctl.rs
