io/command: use glib GSpawn, instead of open-coding fork/exec

Simplify qio_channel_command_new_spawn() with GSpawn API. This will
allow to build for WIN32 in the following patches.

As pointed out by Daniel Berrangé: there is a change in semantics here
too. The current code only touches stdin/stdout/stderr. Any other FDs
which do NOT have O_CLOEXEC set will be inherited. With the new code,
all FDs except stdin/out/err will be explicitly closed, because we don't
set the flag G_SPAWN_LEAVE_DESCRIPTORS_OPEN. The only place we use
QIOChannelCommand today is the migration exec: protocol, and that is
only declared to use stdin/stdout.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20221006113657.2656108-5-marcandre.lureau@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/io/channel-command.h b/include/io/channel-command.h
index 305ac1d..8dc5827 100644
--- a/include/io/channel-command.h
+++ b/include/io/channel-command.h
@@ -41,7 +41,7 @@ struct QIOChannelCommand {
     QIOChannel parent;
     int writefd;
     int readfd;
-    pid_t pid;
+    GPid pid;
 };