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os current_exe using same approach as linux to get always the full absolute path

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but in case of failure (e.g. prcfs not mounted) still using
getexecname.
This commit is contained in:
David Carlier 2021-07-30 17:28:44 +01:00
parent b289bb7fdf
commit cb4519e59c
1 changed files with 17 additions and 13 deletions
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30
library/std/src/sys/unix/os.rs
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@ -368,20 +368,24 @@ pub fn current_exe() -> io::Result<PathBuf> {
#[cfg(any(target_os = "solaris", target_os = "illumos"))]
pub fn current_exe() -> io::Result<PathBuf> {
extern "C" {
fn getexecname() -> *const c_char;
}
unsafe {
let path = getexecname();
if path.is_null() {
Err(io::Error::last_os_error())
} else {
let filename = CStr::from_ptr(path).to_bytes();
let path = PathBuf::from(<OsStr as OsStrExt>::from_bytes(filename));
if let Ok(path) = crate::fs::read_link("/proc/self/path/a.out") {
Ok(path)
} else {
extern "C" {
fn getexecname() -> *const c_char;
}
unsafe {
let path = getexecname();
if path.is_null() {
Err(io::Error::last_os_error())
} else {
let filename = CStr::from_ptr(path).to_bytes();
let path = PathBuf::from(<OsStr as OsStrExt>::from_bytes(filename));
// Prepend a current working directory to the path if
// it doesn't contain an absolute pathname.
if filename[0] == b'/' { Ok(path) } else { getcwd().map(|cwd| cwd.join(path)) }
// Prepend a current working directory to the path if
// it doesn't contain an absolute pathname.
if filename[0] == b'/' { Ok(path) } else { getcwd().map(|cwd| cwd.join(path)) }
}
}
}
}