Use 'yes' for AIX.

Author: xingxue-ibm

tests/ui/process/process-sigpipe.rs

@@ -22,14 +22,23 @@ use std::process;
 use std::thread;
 
 fn main() {
-    // Just in case `yes` doesn't check for EPIPE...
+    // Just in case `yes` or `while-echo` doesn't check for EPIPE...
     thread::spawn(|| {
         thread::sleep_ms(5000);
         process::exit(1);
     });
+    // The 'sh' of AIX prints a message about a broken pipe with the command
+    // using 'while-echo'. It works as expected when using 'yes' instead,
+    // which was originally used in this test but later changed because some
+    // platforms do not have 'yes'. Therefore, use 'yes' for AIX.
+    let command = if cfg!(target_os = "aix") {
+        "yes | head"
+    } else {
+        "while echo y ; do : ; done | head"
+    };
     let output = process::Command::new("sh")
         .arg("-c")
-        .arg("while echo y ; do : ; done | head")
+        .arg(command)
         .output()
         .unwrap();
     assert!(output.status.success());