core: add support for setting stdin/stdout/stderr for transient services

When starting a transient service, allow setting stdin/stdout/stderr fds
for it, by passing them in via the bus.

This also simplifies some of the serialization code for units.

1 files changed, 11 insertions, 8 deletions

diff --git a/src/core/execute.h b/src/core/execute.h
index f1c37116fd..f8995a4203 100644
--- a/src/core/execute.h
+++ b/src/core/execute.h
@@ -208,23 +208,22 @@ struct ExecContext {
 
 struct ExecParameters {
         char **argv;
+        char **environment;
 
         int *fds;
         char **fd_names;
         unsigned n_fds;
 
-        char **environment;
-
-        bool apply_permissions;
-        bool apply_chroot;
-        bool apply_tty_stdin;
+        bool apply_permissions:1;
+        bool apply_chroot:1;
+        bool apply_tty_stdin:1;
 
-        bool confirm_spawn;
-        bool selinux_context_net;
+        bool confirm_spawn:1;
+        bool selinux_context_net:1;
 
+        bool cgroup_delegate:1;
         CGroupMask cgroup_supported;
         const char *cgroup_path;
-        bool cgroup_delegate;
 
         const char *runtime_prefix;
 
@@ -234,6 +233,10 @@ struct ExecParameters {
 
         char *bus_endpoint_path;
         int bus_endpoint_fd;
+
+        int stdin_fd;
+        int stdout_fd;
+        int stderr_fd;
 };
 
 int exec_spawn(Unit *unit,