Process spawning via PATH is different on unix than it is on windows

Due to the separate fork + exec steps on unix, the following test case passes on unix. On windows, however, the "atomic" fork + exec causes the test to fail.

Notably, on unix the child's PATH environment variable is used to lookup the program to execute, whereas on windows it uses the parent's PATH variable.

use std::os;
use std::io::{File, TempDir, Command, util, UserRWX, fs};

fn main() {
    let args = os::args();
    if args.len() > 1 && args.get(1).as_slice() == "child" {
        return assert_eq!(args.get(0).as_slice(), "mytest");
    }

    let dir = TempDir::new("mytest").unwrap();
    let me = os::self_exe_name().unwrap();
    let dest = dir.path().join("mytest");
    util::copy(&mut File::open(&me), &mut File::create(&dest)).unwrap();
    fs::chmod(&dest, UserRWX).unwrap();

    Command::new("mytest").env(&[("PATH".to_string(),
                                  dir.path().as_str().unwrap().to_string())])
                          .arg("child")
                          .spawn().unwrap();
}

The behavior of the two platforms needs to be consistent, and I believe that the unix behavior is what one would expect.

Note that the test is just copying itself to a temporary directory and then running it from the temporary directory via PATH (cutting through the irrelevant bits)

The Unix behavior sounds right to me.

I have a proposed fix with libuv to fix the libgreen side of things: joyent/libuv#1337

native, rustuv: Fix spawning with empty args

auto merge of #16284 : alexcrichton/rust/issue-16272, r=aturon

Fix lots of windows tests

Auto merge of rust-lang#15149 - Veykril:line-index-perf, r=Veykril

Lint docs: Sort versions, so that stable comes first (rust-lang#15149)

Fix Windows PATH resolution to respect PATH order instead of System32…

cli-test: Remove special handling for `rad`

Navigation Menu

Repository navigation

Process spawning via PATH is different on unix than it is on windows #15149

6 remaining items

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Process spawning via PATH is different on unix than it is on windows #15149

Description

Activity

alexcrichton commented on Jun 24, 2014

wycats commented on Jun 24, 2014

alexcrichton commented on Jun 24, 2014

6 remaining items

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions