From 2ddca326beb34d249b23ada39d40fb76c8c4ef70 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Fri, 19 Jun 2020 16:28:43 -0400
Subject: [PATCH] LibC: Add POSIX_SPAWN_SETSIGMASK

This isn't in posix yet, but it is implemented on some platforms
and it will be in a future version:
https://www.austingroupbugs.net/view.php?id=1044

It seems useful, so add it.
---
 Libraries/LibC/spawn.cpp | 8 +++++++-
 Libraries/LibC/spawn.h   | 4 ++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Libraries/LibC/spawn.cpp b/Libraries/LibC/spawn.cpp
index c8815d9274..026a0fe1df 100644
--- a/Libraries/LibC/spawn.cpp
+++ b/Libraries/LibC/spawn.cpp
@@ -95,6 +95,12 @@ extern "C" {
                 exit(127);
             }
         }
+        if (flags & POSIX_SPAWN_SETSID) {
+            if (setsid() < 0) {
+                perror("posix_spawn setsid");
+                exit(127);
+            }
+        }
 
         // FIXME: POSIX_SPAWN_SETSCHEDULER
     }
@@ -232,7 +238,7 @@ int posix_spawnattr_init(posix_spawnattr_t* attr)
 
 int posix_spawnattr_setflags(posix_spawnattr_t* attr, short flags)
 {
-    if (flags & ~(POSIX_SPAWN_RESETIDS | POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER | POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK))
+    if (flags & ~(POSIX_SPAWN_RESETIDS | POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER | POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSID))
         return EINVAL;
 
     attr->flags = flags;
diff --git a/Libraries/LibC/spawn.h b/Libraries/LibC/spawn.h
index 03bd4c1899..d6d0e03086 100644
--- a/Libraries/LibC/spawn.h
+++ b/Libraries/LibC/spawn.h
@@ -50,8 +50,12 @@ enum {
 
     POSIX_SPAWN_SETSIGDEF = 1 << 4,
     POSIX_SPAWN_SETSIGMASK = 1 << 5,
+
+    POSIX_SPAWN_SETSID = 1 << 6,
 };
 
+#define POSIX_SPAWN_SETSID POSIX_SPAWN_SETSID
+
 struct posix_spawn_file_actions_state;
 typedef struct {
     struct posix_spawn_file_actions_state* state;