add spawn_pg

1 files changed, 26 insertions, 0 deletions

diff --git a/src/sys.rs b/src/sys.rs
index 0d897bc..36d87c1 100644
--- a/src/sys.rs
+++ b/src/sys.rs
@@ -76,6 +76,32 @@ pub fn session_leader(
     }
 }
 
+pub fn set_process_group_child(
+    pg: Option<u32>,
+) -> impl FnMut() -> std::io::Result<()> {
+    move || {
+        nix::unistd::setpgid(
+            nix::unistd::Pid::from_raw(0),
+            pg.map_or(nix::unistd::Pid::from_raw(0), |pid| {
+                nix::unistd::Pid::from_raw(pid.try_into().unwrap())
+            }),
+        )?;
+        Ok(())
+    }
+}
+
+pub fn set_process_group_parent(
+    pid: u32,
+    pg: Option<u32>,
+) -> nix::Result<()> {
+    nix::unistd::setpgid(
+        nix::unistd::Pid::from_raw(pid.try_into().unwrap()),
+        pg.map_or(nix::unistd::Pid::from_raw(0), |pid| {
+            nix::unistd::Pid::from_raw(pid.try_into().unwrap())
+        }),
+    )
+}
+
 fn set_controlling_terminal(fd: std::os::unix::io::RawFd) -> nix::Result<()> {
     // Safety: std::fs::File is required to contain a valid file descriptor
     unsafe { set_controlling_terminal_unsafe(fd, std::ptr::null()) }