new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_process.h
@@ -0,0 +1,67 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#ifndef _NGX_PROCESS_H_INCLUDED_
+#define _NGX_PROCESS_H_INCLUDED_
+
+
+typedef pid_t       ngx_pid_t;
+
+typedef void (*ngx_spawn_proc_pt) (ngx_cycle_t *cycle, void *data);
+
+typedef struct {
+    ngx_pid_t           pid;
+    int                 status;
+    ngx_socket_t        channel[2];
+
+    ngx_spawn_proc_pt   proc;
+    void               *data;
+    char               *name;
+
+    unsigned            respawn:1;
+    unsigned            just_respawn:1;
+    unsigned            detached:1;
+    unsigned            exiting:1;
+    unsigned            exited:1;
+} ngx_process_t;
+
+
+typedef struct {
+    char         *path;
+    char         *name;
+    char *const  *argv;
+    char *const  *envp;
+} ngx_exec_ctx_t;
+
+
+#define NGX_MAX_PROCESSES         1024
+
+#define NGX_PROCESS_NORESPAWN     -1
+#define NGX_PROCESS_RESPAWN       -2
+#define NGX_PROCESS_JUST_RESPAWN  -3
+#define NGX_PROCESS_DETACHED      -4
+
+
+#define ngx_getpid   getpid
+#define ngx_log_pid  ngx_pid
+
+ngx_pid_t ngx_spawn_process(ngx_cycle_t *cycle,
+                            ngx_spawn_proc_pt proc, void *data,
+                            char *name, ngx_int_t respawn);
+ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx);
+void ngx_process_get_status(void);
+
+#define ngx_sched_yield()  sched_yield()
+
+
+extern ngx_pid_t      ngx_pid;
+extern ngx_socket_t   ngx_channel;
+extern ngx_int_t      ngx_process_slot;
+extern ngx_int_t      ngx_last_process;
+extern ngx_process_t  ngx_processes[NGX_MAX_PROCESSES];
+
+
+#endif /* _NGX_PROCESS_H_INCLUDED_ */