Move e_pid and e_pgid to libprocess, Add get_self_pid () syscall

ce/interp.c

@@ -4,7 +4,6 @@
 #include "edit.h"
 #include "mprintf.h"
 #include "parser.h"
-#include "self.h"
 #include <debugconsole.h>
 #include <desc.h>
 #include <filereader.h>
@@ -16,6 +15,7 @@
 #include <path.h>
 #include <printf.h>
 #include <process.h>
+#include <process_self.h>
 #include <stddef.h>
 #include <str_status.h>
 #include <string.h>
@@ -160,7 +160,7 @@ static void cat (struct context* context, char** file_paths, size_t files_count)
         return;
       }
 
-      mail_send (e_pgid, buffer, chunk_size);
+      mail_send (process_get_exec_pgid (), buffer, chunk_size);
     }
 
     if (rem > 0) {
@@ -170,7 +170,7 @@ static void cat (struct context* context, char** file_paths, size_t files_count)
         return;
       }
 
-      mail_send (e_pgid, buffer, rem);
+      mail_send (process_get_exec_pgid (), buffer, rem);
     }
 
     filereader_fini (&fr);
@@ -357,7 +357,7 @@ static void cmd_collect_proc (void* arg) {
     char recv[RECV_MAX];
     memset (recv, 0, sizeof (recv));
     if (mail_receive_nonblock (&recv, sizeof (recv) - 1) == ST_OK) {
-      mail_send (e_pgid, recv, strlen (recv));
+      mail_send (process_get_exec_pgid (), recv, strlen (recv));
     }
   }
 }