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
|
#![allow(unstable)]
extern crate nix;
#[cfg(test)]
mod test {
use nix::unistd::{writev, readv, Iovec, pipe, close, read, write};
use std::cmp::min;
use std::iter::repeat;
use std::rand::{thread_rng, Rng};
use nix::unistd::{fork};
use nix::sys::wait::{waitpid, WaitStatus};
use nix::unistd::Fork::{Parent, Child};
#[test]
fn test_writev() {
let mut to_write = Vec::with_capacity(16 * 128);
for _ in range(0, 16) {
let s:String = thread_rng().gen_ascii_chars().take(128).collect();
let b = s.as_bytes();
to_write.extend(b.iter().map(|x| x.clone()));
}
// Allocate and fill iovecs
let mut iovecs = Vec::new();
let mut consumed = 0;
while consumed < to_write.len() {
let left = to_write.len() - consumed;
let slice_len = if left < 64 { left } else { thread_rng().gen_range(64, min(256, left)) };
let b = &to_write[consumed..consumed+slice_len];
iovecs.push(Iovec::from_slice(b));
consumed += slice_len;
}
let pipe_res = pipe();
assert!(pipe_res.is_ok());
let (reader, writer) = pipe_res.ok().unwrap();
// FileDesc will close its filedesc (reader).
let mut read_buf: Vec<u8> = repeat(0u8).take(128 * 16).collect();
// Blocking io, should write all data.
let write_res = writev(writer, iovecs.as_slice());
// Successful write
assert!(write_res.is_ok());
let written = write_res.ok().unwrap();
// Check whether we written all data
assert_eq!(to_write.len(), written);
let read_res = read(reader, read_buf.as_mut_slice());
// Successful read
assert!(read_res.is_ok());
let read = read_res.ok().unwrap() as usize;
// Check we have read as much as we written
assert_eq!(read, written);
// Check equality of written and read data
assert_eq!(to_write.as_slice(), read_buf.as_slice());
let close_res = close(writer);
assert!(close_res.is_ok());
let close_res = close(reader);
assert!(close_res.is_ok());
}
#[test]
fn test_readv() {
let s:String = thread_rng().gen_ascii_chars().take(128).collect();
let to_write = s.as_bytes().to_vec();
let mut storage = Vec::new();
let mut allocated = 0;
while allocated < to_write.len() {
let left = to_write.len() - allocated;
let vec_len = if left < 64 { left } else { thread_rng().gen_range(64, min(256, left)) };
let v: Vec<u8> = repeat(0u8).take(vec_len).collect();
storage.push(v);
allocated += vec_len;
}
let mut iovecs = Vec::with_capacity(storage.len());
for v in storage.iter_mut() {
iovecs.push(Iovec::from_mut_slice(v.as_mut_slice()));
}
let pipe_res = pipe();
assert!(pipe_res.is_ok());
let (reader, writer) = pipe_res.ok().unwrap();
// Blocking io, should write all data.
let write_res = write(writer, to_write.as_slice());
// Successful write
assert!(write_res.is_ok());
let read_res = readv(reader, iovecs.as_mut_slice());
assert!(read_res.is_ok());
let read = read_res.ok().unwrap();
// Check whether we've read all data
assert_eq!(to_write.len(), read);
// Cccumulate data from iovecs
let mut read_buf = Vec::with_capacity(to_write.len());
for iovec in iovecs.iter() {
read_buf.extend(iovec.as_slice().iter().map(|x| x.clone()));
}
// Check whether iovecs contain all written data
assert_eq!(read_buf.len(), to_write.len());
// Check equality of written and read data
assert_eq!(read_buf.as_slice(), to_write.as_slice());
let close_res = close(reader);
assert!(close_res.is_ok());
let close_res = close(writer);
assert!(close_res.is_ok());
}
#[test]
fn test_fork_and_waitpid() {
let pid = fork();
match pid {
Ok(Child) => {} // ignore child here
Ok(Parent(child_pid)) => {
// assert that child was created and pid > 0
assert!(child_pid > 0);
let wait_status = waitpid(child_pid, None);
match wait_status {
// assert that waitpid returned correct status and the pid is the one of the child
Ok(WaitStatus::Exited(pid_t)) => assert!(pid_t == child_pid),
// panic, must never happen
Ok(WaitStatus::StillAlive) => panic!("Child still alive, should never happen"),
// panic, waitpid should never fail
Err(_) => panic!("Error: waitpid Failed")
}
},
// panic, fork should never fail unless there is a serious problem with the OS
Err(_) => panic!("Error: Fork Failed")
}
}
}
|
