WebSVN – HelenOS – Diff – //branches/network/uspace/srv/loader/main.c

  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 /** @addtogroup loader
- * @brief   Loads and runs programs from VFS.
+ * @brief Loads and runs programs from VFS.
  * @{
  */
 /**
  * @file
- * @brief   Loads and runs programs from VFS.
+ * @brief Loads and runs programs from VFS.
+ *
  * The program loader is a special init binary. Its image is used
  * to create a new task upon a @c task_spawn syscall. The syscall
  * returns the id of a phone connected to the newly created task.
+ *
  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <bool.h>
 #include <fcntl.h>
 #include <sys/types.h>
 #include <ipc/ipc.h>
+#include <ipc/services.h>
 #include <ipc/loader.h>
 #include <loader/pcb.h>
 #include <errno.h>
 #include <async.h>
 #include <as.h>
 #include <elf.h>
 #include <elf_load.h>
-/**
- * Bias used for loading the dynamic linker. This will be soon replaced
- * by automatic placement.
- */
-#define RTLD_BIAS 0x80000
+#define DPRINTF(...)
 /** Pathname of the file that will be loaded */
 static char *pathname = NULL;
 /** The Program control block */
 /** Argument vector */
 static char **argv = NULL;
 /** Buffer holding all arguments */
 static char *arg_buf = NULL;
+static elf_info_t prog_info;
+static elf_info_t interp_info;
+static bool is_dyn_linked;
+/** Used to limit number of connections to one. */
+static bool connected;
+static void loader_get_taskid(ipc_callid_t rid, ipc_call_t *request)
+{
+    ipc_callid_t callid;
+    task_id_t task_id;
+    size_t len;
+    task_id = task_get_id();
+    if (!ipc_data_read_receive(&callid, &len)) {
+        ipc_answer_0(callid, EINVAL);
+        ipc_answer_0(rid, EINVAL);
+        return;
+    }
+    if (len > sizeof(task_id))
+        len = sizeof(task_id);
+    ipc_data_read_finalize(callid, &task_id, len);
+    ipc_answer_0(rid, EOK);
+}
 /** Receive a call setting pathname of the program to execute.
+ *
  * @param rid
  * @param request
  */
 static void loader_set_pathname(ipc_callid_t rid, ipc_call_t *request)
+{
     ipc_callid_t callid;
     size_t len;
     char *name_buf;
     if (!ipc_data_write_receive(&callid, &len)) {
         ipc_answer_0(callid, EINVAL);
         ipc_answer_0(rid, EINVAL);
         return;
+    }
     name_buf = malloc(len + 1);
     if (!name_buf) {
         ipc_answer_0(callid, ENOMEM);
         ipc_answer_0(rid, ENOMEM);
         return;
+    }
     ipc_data_write_finalize(callid, name_buf, len);
     ipc_answer_0(rid, EOK);
     if (pathname != NULL) {
         free(pathname);
         pathname = NULL;
+    }
     name_buf[len] = '\0';
     pathname = name_buf;
+}
 /** Receive a call setting arguments of the program to execute.
+{
     ipc_callid_t callid;
     size_t buf_len, arg_len;
     char *p;
     int n;
     if (!ipc_data_write_receive(&callid, &buf_len)) {
         ipc_answer_0(callid, EINVAL);
         ipc_answer_0(rid, EINVAL);
         return;
+    }
     if (arg_buf != NULL) {
         free(arg_buf);
         arg_buf = NULL;
+    }
     if (argv != NULL) {
         free(argv);
         argv = NULL;
+    }
     arg_buf = malloc(buf_len + 1);
     if (!arg_buf) {
         ipc_answer_0(callid, ENOMEM);
         ipc_answer_0(rid, ENOMEM);
         return;
+    }
     ipc_data_write_finalize(callid, arg_buf, buf_len);
     ipc_answer_0(rid, EOK);
     arg_buf[buf_len] = '\0';
     /*
      * Count number of arguments
      */
     p = arg_buf;
     n = 0;
     while (p < arg_buf + buf_len) {
         arg_len = strlen(p);
         p = p + arg_len + 1;
         ++n;
+    }
     /* Allocate argv */
     argv = malloc((n + 1) * sizeof(char *));
     if (argv == NULL) {
         free(arg_buf);
         ipc_answer_0(callid, ENOMEM);
         ipc_answer_0(rid, ENOMEM);
         return;
+    }
     /*
      * Fill argv with argument pointers
      */
     p = arg_buf;
     n = 0;
     while (p < arg_buf + buf_len) {
         argv[n] = p;
         arg_len = strlen(p);
         p = p + arg_len + 1;
         ++n;
+    }
     argc = n;
     argv[n] = NULL;
+}
-/** Load and run the previously selected program.
+/** Load the previously selected program.
+ *
  * @param rid
  * @param request
  * @return 0 on success, !0 on error.
  */
-static int loader_run(ipc_callid_t rid, ipc_call_t *request)
+static int loader_load(ipc_callid_t rid, ipc_call_t *request)
+{
     int rc;
-    elf_info_t prog_info;
-    elf_info_t interp_info;
-//  printf("Load program '%s'\n", pathname);
     rc = elf_load_file(pathname, 0, &prog_info);
     if (rc < 0) {
-        printf("failed to load program\n");
+        DPRINTF("Failed to load executable '%s'.\n", pathname);
         ipc_answer_0(rid, EINVAL);
         return 1;
+    }
-//  printf("Create PCB\n");
     elf_create_pcb(&prog_info, &pcb);
     pcb.argc = argc;
     pcb.argv = argv;
     if (prog_info.interp == NULL) {
         /* Statically linked program */
-//      printf("Run statically linked program\n");
+        is_dyn_linked = false;
-//      printf("entry point: 0x%llx\n", prog_info.entry);
         ipc_answer_0(rid, EOK);
-        close_console();
-        elf_run(&prog_info, &pcb);
         return 0;
+    }
-    printf("Load dynamic linker '%s'\n", prog_info.interp);
-    rc = elf_load_file("/rtld.so", RTLD_BIAS, &interp_info);
+    rc = elf_load_file(prog_info.interp, 0, &interp_info);
     if (rc < 0) {
-        printf("failed to load dynamic linker\n");
+        DPRINTF("Failed to load interpreter '%s.'\n",
+            prog_info.interp);
         ipc_answer_0(rid, EINVAL);
         return 1;
+    }
+    is_dyn_linked = true;
+    ipc_answer_0(rid, EOK);
+    return 0;
+}
-    /*
-     * Provide dynamic linker with some useful data
-     */
-    pcb.rtld_dynamic = interp_info.dynamic;
-    pcb.rtld_bias = RTLD_BIAS;
-    printf("run dynamic linker\n");
-    printf("entry point: 0x%llx\n", interp_info.entry);
-    close_console();
+/** Run the previously loaded program.
+ *
+ * @param rid
+ * @param request
+ * @return 0 on success, !0 on error.
+ */
+static void loader_run(ipc_callid_t rid, ipc_call_t *request)
+{
+    const char *cp;
+    /* Set the task name. */
+    cp = strrchr(pathname, '/');
+    cp = (cp == NULL) ? pathname : (cp + 1);
+    task_set_name(cp);
+    if (is_dyn_linked == true) {
+        /* Dynamically linked program */
+        DPRINTF("Run ELF interpreter.\n");
+        DPRINTF("Entry point: 0x%lx\n", interp_info.entry);
+        close_console();
-    ipc_answer_0(rid, EOK);
+        ipc_answer_0(rid, EOK);
-    elf_run(&interp_info, &pcb);
+        elf_run(&interp_info, &pcb);
+    } else {
+        /* Statically linked program */
+        close_console();
+        ipc_answer_0(rid, EOK);
+        elf_run(&prog_info, &pcb);
+    }
     /* Not reached */
-    return 0;
+}
 /** Handle loader connection.
+ *
  * Receive and carry out commands (of which the last one should be
 static void loader_connection(ipc_callid_t iid, ipc_call_t *icall)
+{
     ipc_callid_t callid;
     ipc_call_t call;
     int retval;
+    /* Already have a connection? */
+    if (connected) {
+        ipc_answer_0(iid, ELIMIT);
+        return;
+    }
+    connected = true;
+    /* Accept the connection */
+    ipc_answer_0(iid, EOK);
     /* Ignore parameters, the connection is already open */
+    (void) iid;
-    (void)iid; (void)icall;
+    (void) icall;
     while (1) {
         callid = async_get_call(&call);
-//      printf("received call from phone %d, method=%d\n",
-//          call.in_phone_hash, IPC_GET_METHOD(call));
         switch (IPC_GET_METHOD(call)) {
+        case IPC_M_PHONE_HUNGUP:
+            exit(0);
+        case LOADER_GET_TASKID:
+            loader_get_taskid(callid, &call);
+            continue;
         case LOADER_SET_PATHNAME:
             loader_set_pathname(callid, &call);
             continue;
         case LOADER_SET_ARGS:
             loader_set_args(callid, &call);
+            continue;
+        case LOADER_LOAD:
+            loader_load(callid, &call);
+            continue;
         case LOADER_RUN:
             loader_run(callid, &call);
-            exit(0);
-            continue;
+            /* Not reached */
         default:
             retval = ENOENT;
             break;
+        }
         if ((callid & IPC_CALLID_NOTIFICATION) == 0 &&
             IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP) {
-            printf("responding EINVAL to method %d\n",
+            DPRINTF("Responding EINVAL to method %d.\n",
                 IPC_GET_METHOD(call));
             ipc_answer_0(callid, EINVAL);
+        }
+    }
+}
 /** Program loader main function.
  */
 int main(int argc, char *argv[])
+{
-    ipc_callid_t callid;
-    ipc_call_t call;
-    ipcarg_t phone_hash;
+    ipcarg_t phonead;
-    /* The first call only communicates the incoming phone hash */
-    callid = ipc_wait_for_call(&call);
-    if (IPC_GET_METHOD(call) != LOADER_HELLO) {
-        if (IPC_GET_METHOD(call) != IPC_M_PHONE_HUNGUP)
-            ipc_answer_0(callid, EINVAL);
-        return 1;
+    connected = false;
-    }
-    ipc_answer_0(callid, EOK);
+    /* Set a handler of incomming connections. */
-    phone_hash = call.in_phone_hash;
+    async_set_client_connection(loader_connection);
-    /*
-     * Up until now async must not be used as it couldn't
+    /* Register at naming service. */
-     * handle incoming requests. (Which means e.g. printf()
+    if (ipc_connect_to_me(PHONE_NS, SERVICE_LOAD, 0, 0, &phonead) != 0)
-     * cannot be used)
+        return -1;
-     */
-    async_new_connection(phone_hash, 0, NULL, loader_connection);
     async_manager();
-    /* not reached */
+    /* Never reached */
     return 0;
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)//branches/network/uspace/srv/loader/main.c – Rev 3386 → 4153