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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * Copyright (c) 2008 Jiri Svoboda
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. /** @addtogroup libc
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <task.h>
  37. #include <ipc/ipc.h>
  38. #include <ipc/loader.h>
  39. #include <libc.h>
  40. #include <string.h>
  41. #include <stdlib.h>
  42. #include <async.h>
  43. #include <errno.h>
  44.  
  45. task_id_t task_get_id(void)
  46. {
  47.     task_id_t task_id;
  48.  
  49.     (void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
  50.  
  51.     return task_id;
  52. }
  53.  
  54. static int task_spawn_loader(void)
  55. {
  56.     int phone_id, rc;
  57.  
  58.     rc = __SYSCALL1(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id);
  59.     if (rc != 0)
  60.         return rc;
  61.  
  62.     return phone_id;
  63. }
  64.  
  65. static int loader_set_args(int phone_id, const char *argv[])
  66. {
  67.     aid_t req;
  68.     ipc_call_t answer;
  69.     ipcarg_t rc;
  70.  
  71.     const char **ap;
  72.     char *dp;
  73.     char *arg_buf;
  74.     size_t buffer_size;
  75.     size_t len;
  76.  
  77.     /*
  78.      * Serialize the arguments into a single array. First
  79.      * compute size of the buffer needed.
  80.      */
  81.     ap = argv;
  82.     buffer_size = 0;
  83.     while (*ap != NULL) {
  84.         buffer_size += strlen(*ap) + 1;
  85.         ++ap;
  86.     }
  87.  
  88.     arg_buf = malloc(buffer_size);
  89.     if (arg_buf == NULL) return ENOMEM;
  90.  
  91.     /* Now fill the buffer with null-terminated argument strings */
  92.     ap = argv;
  93.     dp = arg_buf;
  94.     while (*ap != NULL) {
  95.         strcpy(dp, *ap);
  96.         dp += strlen(*ap) + 1;
  97.  
  98.         ++ap;
  99.     }
  100.  
  101.     /* Send serialized arguments to the loader */
  102.  
  103.     req = async_send_0(phone_id, LOADER_SET_ARGS, &answer);
  104.     rc = ipc_data_write_start(phone_id, (void *)arg_buf, buffer_size);
  105.     if (rc != EOK) {
  106.         async_wait_for(req, NULL);
  107.         return rc;
  108.     }
  109.  
  110.     async_wait_for(req, &rc);
  111.     if (rc != EOK) return rc;
  112.  
  113.     /* Free temporary buffer */
  114.     free(arg_buf);
  115.  
  116.     return EOK;
  117. }
  118.  
  119. /** Create a new task by running an executable from VFS.
  120.  *
  121.  * @param path  pathname of the binary to execute
  122.  * @param argv  command-line arguments
  123.  * @return  ID of the newly created task or zero on error.
  124.  */
  125. task_id_t task_spawn(const char *path, const char *argv[])
  126. {
  127.     int phone_id;
  128.     ipc_call_t answer;
  129.     aid_t req;
  130.     int rc;
  131.     ipcarg_t retval;
  132.  
  133.     /* Spawn a program loader */   
  134.     phone_id = task_spawn_loader();
  135.     if (phone_id < 0) return 0;
  136.  
  137.     /*
  138.      * Say hello so that the loader knows the incoming connection's
  139.      * phone hash.
  140.      */
  141.     rc = async_req_0_0(phone_id, LOADER_HELLO);
  142.     if (rc != EOK) return 0;
  143.  
  144.     /* Send program pathname */
  145.     req = async_send_0(phone_id, LOADER_SET_PATHNAME, &answer);
  146.     rc = ipc_data_write_start(phone_id, (void *)path, strlen(path));
  147.     if (rc != EOK) {
  148.         async_wait_for(req, NULL);
  149.         return 1;
  150.     }
  151.  
  152.     async_wait_for(req, &retval);
  153.     if (retval != EOK) goto error;
  154.  
  155.     /* Send arguments */
  156.     rc = loader_set_args(phone_id, argv);
  157.     if (rc != EOK) goto error;
  158.  
  159.     /* Request loader to start the program */  
  160.     rc = async_req_0_0(phone_id, LOADER_RUN);
  161.     if (rc != EOK) goto error;
  162.  
  163.     /* Success */
  164.     ipc_hangup(phone_id);
  165.     return 1;
  166.  
  167.     /* Error exit */
  168. error:
  169.     ipc_hangup(phone_id);
  170.     return 0;
  171. }
  172.  
  173. /** @}
  174.  */
  175.