Multi platform mechanism for getting error message from libc

ChrisDryden · ChrisDryden · commit fefe618149c1 · 2025-11-28T21:24:51.000Z
diff --git a/src/uucore/src/lib/features/process.rs b/src/uucore/src/lib/features/process.rs
@@ -72,8 +72,13 @@ pub fn pid_is_alive(pid: i32) -> bool {
     if pid <= 0 {
         return true;
     }
+    #[cfg(target_os = "linux")]
+    let errno_ptr = unsafe { libc::__errno_location() };
 
-    unsafe { libc::kill(pid, 0) == 0 || *libc::__errno_location() != libc::ESRCH }
+    #[cfg(any(target_os = "macos", target_os = "freebsd", target_os = "netbsd"))]
+    let errno_ptr = unsafe { libc::__error() };
+
+    unsafe { libc::kill(pid, 0) == 0 || *errno_ptr != libc::ESRCH }
 }
 
 /// `getsid()` returns the session ID of the process with process ID pid.

Original file line number	Diff line number	Diff line change
`@@ -72,8 +72,13 @@ pub fn pid_is_alive(pid: i32) -> bool {`
`72`	`72`	`if pid <= 0 {`
`73`	`73`	`return true;`
`74`	`74`	`}`
	`75`	`+ #[cfg(target_os = "linux")]`
	`76`	`+ let errno_ptr = unsafe { libc::__errno_location() };`
`75`	`77`
`76`		`- unsafe { libc::kill(pid, 0) == 0 \|\| *libc::__errno_location() != libc::ESRCH }`
	`78`	`+ #[cfg(any(target_os = "macos", target_os = "freebsd", target_os = "netbsd"))]`
	`79`	`+ let errno_ptr = unsafe { libc::__error() };`
	`80`	`+`
	`81`	`+ unsafe { libc::kill(pid, 0) == 0 \|\| *errno_ptr != libc::ESRCH }`
`77`	`82`	`}`
`78`	`83`
`79`	`84`	/// `getsid()` returns the session ID of the process with process ID pid.