support process group

executer/include/uprotocol.h

@@ -70,6 +70,7 @@ struct program_load_desc {
 	int pid;
 	int err;
 	int stack_prot;
+	int pgid;
 	unsigned long entry;
 	unsigned long user_start;
 	unsigned long user_end;

executer/user/mcexec.c

@@ -215,6 +215,7 @@ struct program_load_desc *load_elf(FILE *fp, char **interp_pathp)
 		}
 	}
 	desc->pid = getpid();
+	desc->pgid = getpgid(0);
 	desc->entry = hdr.e_entry;
 
 	desc->at_phdr = load_addr + hdr.e_phoff;