Message passing / mail system

libmsl/m/system.c

@@ -52,3 +52,15 @@ int read (const char* path, size_t off, uint8_t* buffer, size_t size) {
 int describe (const char* path, struct fs_desc_buffer* desc) {
   return (int)do_syscall (SYS_DESCRIBE, path, desc);
 }
+
+int mail_send (int pgid, void* mesg, size_t mesg_size) {
+  return (int)do_syscall (SYS_MAIL_SEND, pgid, mesg, mesg_size);
+}
+
+int mail_receive (void* mesg, size_t mesg_size) {
+  return (int)do_syscall (SYS_MAIL_RECEIVE, mesg, mesg_size);
+}
+
+int get_procgroup (int pid) { return (int)do_syscall (SYS_GET_PROCGROUP, pid); }
+
+int get_exec_pid (void) { return (int)do_syscall (SYS_GET_EXEC_PID, 0); }