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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. #include <vfs/vfs.h>
  45.  
  46. task_id_t task_get_id(void)
  47. {
  48.     task_id_t task_id;
  49.  
  50.     (void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
  51.  
  52.     return task_id;
  53. }
  54.  
  55. static int task_spawn_loader(void)
  56. {
  57.     int phone_id, rc;
  58.  
  59.     rc = __SYSCALL1(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id);
  60.     if (rc != 0)
  61.         return rc;
  62.  
  63.     return phone_id;
  64. }
  65.  
  66. static int loader_set_args(int phone_id, const char *argv[])
  67. {
  68.     aid_t req;
  69.     ipc_call_t answer;
  70.     ipcarg_t rc;
  71.  
  72.     const char **ap;
  73.     char *dp;
  74.     char *arg_buf;
  75.     size_t buffer_size;
  76.     size_t len;
  77.  
  78.     /*
  79.      * Serialize the arguments into a single array. First
  80.      * compute size of the buffer needed.
  81.      */
  82.     ap = argv;
  83.     buffer_size = 0;
  84.     while (*ap != NULL) {
  85.         buffer_size += strlen(*ap) + 1;
  86.         ++ap;
  87.     }
  88.  
  89.     arg_buf = malloc(buffer_size);
  90.     if (arg_buf == NULL) return ENOMEM;
  91.  
  92.     /* Now fill the buffer with null-terminated argument strings */
  93.     ap = argv;
  94.     dp = arg_buf;
  95.     while (*ap != NULL) {
  96.         strcpy(dp, *ap);
  97.         dp += strlen(*ap) + 1;
  98.  
  99.         ++ap;
  100.     }
  101.  
  102.     /* Send serialized arguments to the loader */
  103.  
  104.     req = async_send_0(phone_id, LOADER_SET_ARGS, &answer);
  105.     rc = ipc_data_write_start(phone_id, (void *)arg_buf, buffer_size);
  106.     if (rc != EOK) {
  107.         async_wait_for(req, NULL);
  108.         return rc;
  109.     }
  110.  
  111.     async_wait_for(req, &rc);
  112.     if (rc != EOK) return rc;
  113.  
  114.     /* Free temporary buffer */
  115.     free(arg_buf);
  116.  
  117.     return EOK;
  118. }
  119.  
  120. /** Create a new task by running an executable from VFS.
  121.  *
  122.  * @param path  pathname of the binary to execute
  123.  * @param argv  command-line arguments
  124.  * @return  ID of the newly created task or zero on error.
  125.  */
  126. task_id_t task_spawn(const char *path, const char *argv[])
  127. {
  128.     int phone_id;
  129.     ipc_call_t answer;
  130.     aid_t req;
  131.     int rc;
  132.     ipcarg_t retval;
  133.  
  134.     char *pa;
  135.     size_t pa_len;
  136.  
  137.     pa = absolutize(path, &pa_len);
  138.     if (!pa)
  139.         return 0;
  140.  
  141.     /* Spawn a program loader */   
  142.     phone_id = task_spawn_loader();
  143.     if (phone_id < 0)
  144.         return 0;
  145.  
  146.     /*
  147.      * Say hello so that the loader knows the incoming connection's
  148.      * phone hash.
  149.      */
  150.     rc = async_req_0_0(phone_id, LOADER_HELLO);
  151.     if (rc != EOK)
  152.         return 0;
  153.  
  154.     /* Send program pathname */
  155.     req = async_send_0(phone_id, LOADER_SET_PATHNAME, &answer);
  156.     rc = ipc_data_write_start(phone_id, (void *)pa, pa_len);
  157.     if (rc != EOK) {
  158.         async_wait_for(req, NULL);
  159.         return 1;
  160.     }
  161.  
  162.     async_wait_for(req, &retval);
  163.     if (retval != EOK)
  164.         goto error;
  165.  
  166.     /* Send arguments */
  167.     rc = loader_set_args(phone_id, argv);
  168.     if (rc != EOK)
  169.         goto error;
  170.  
  171.     /* Request loader to start the program */  
  172.     rc = async_req_0_0(phone_id, LOADER_RUN);
  173.     if (rc != EOK)
  174.         goto error;
  175.  
  176.     /* Success */
  177.     ipc_hangup(phone_id);
  178.     return 1;
  179.  
  180.     /* Error exit */
  181. error:
  182.     ipc_hangup(phone_id);
  183.     return 0;
  184. }
  185.  
  186. /** @}
  187.  */
  188.