feat process: add process support for unix

CMakeLists.txt

@@ -33,6 +33,8 @@ set(
     ${PROJECT_SOURCE_DIR}/src/event/
     ${PROJECT_SOURCE_DIR}/src/connection/
     ${PROJECT_SOURCE_DIR}/src/core/
+    #FIXME: check platform
+    ${PROJECT_SOURCE_DIR}/src/os/unix/
 )
 
 include_directories(${XADB_INCLUDES})

src/os/unix/xdbd_process.c

@@ -0,0 +1,44 @@
+#include <xdbd_process.h>
+#include <stdlib.h>
+
+static void xdbd_execute_proc(xdbd_t *cycle, void *data);
+
+xdbd_pid_t xdbd_spawn_process(xdbd_t *xdbd,
+    xdbd_spawn_proc_pt proc, void *data, char *name) {
+    xdbd_pid_t  pid;
+
+    pid = fork();
+
+    switch (pid) {
+
+    case -1:
+        bfdev_log_err("fork() failed while spawning \"%s\"", name);
+        // xdbd_close_channel(xdbd_processes[s].channel, cycle->log);
+        return XDBD_INVALID_PID;
+
+    case 0:
+        proc(xdbd, data);
+        break;
+
+    default:
+        break;
+    }
+
+    return pid;
+}
+
+xdbd_pid_t xdbd_execute(xdbd_t *cycle, xdbd_exec_ctx_t *ctx) {
+    return xdbd_spawn_process(cycle, xdbd_execute_proc, ctx, ctx->name);
+}
+
+
+static void xdbd_execute_proc(xdbd_t *cycle, void *data) {
+    xdbd_exec_ctx_t  *ctx = data;
+
+    if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
+        bfdev_log_err("execve() failed while executing %s \"%s\"",
+                      ctx->name, ctx->path);
+    }
+
+    exit(1);
+}

src/os/unix/xdbd_process.h

@@ -0,0 +1,32 @@
+#ifndef __NGX_PROCESS__H__
+#define __NGX_PROCESS__H__
+#include <xdbd.h>
+
+typedef pid_t       xdbd_pid_t;
+
+#define XDBD_INVALID_PID  -1
+
+typedef void (*xdbd_spawn_proc_pt) (xdbd_t *xdbd, void *data);
+
+typedef struct {
+    xdbd_pid_t           pid;
+    xdbd_spawn_proc_pt   proc;
+
+} xdbd_process_t;
+
+typedef struct {
+    char         *path;
+    char         *name;
+    char *const  *argv;
+    char *const  *envp;
+} xdbd_exec_ctx_t;
+
+xdbd_pid_t xdbd_spawn_process(xdbd_t *xdbd,
+    xdbd_spawn_proc_pt proc, void *data, char *name);
+
+xdbd_pid_t xdbd_execute(xdbd_t *cycle, xdbd_exec_ctx_t *ctx);
+
+#define ngx_getpid   getpid
+#define ngx_getppid  getppid
+
+#endif  /*__NGX_PROCESS__H__*/