1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <unistd.h>
      19  #include <getcwd.h>
      20  #include <hurd.h>
      21  #include <hurd/fd.h>
      22  #include <fcntl.h>
      23  #include <stdlib.h>
      24  #include <stdio.h>
      25  
      26  /* Replace the current process, executing FILE_NAME with arguments ARGV and
      27     environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
      28  int
      29  __execveat (int dirfd, const char *file_name, char *const argv[],
      30              char *const envp[], int flags)
      31  {
      32    error_t err;
      33    char *concat_name = NULL;
      34    const char *abs_path;
      35  
      36    file_t file = __file_name_lookup_at (dirfd, flags, file_name, O_EXEC, 0);
      37    if (file == MACH_PORT_NULL)
      38      return -1;
      39  
      40    if (file_name[0] == '/')
      41      {
      42        /* Already an absolute path */
      43        abs_path = file_name;
      44      }
      45    else
      46      {
      47        /* Relative path */
      48        char *cwd;
      49        if (dirfd == AT_FDCWD)
      50  	{
      51  	  cwd = __getcwd (NULL, 0);
      52  	  if (cwd == NULL)
      53  	    {
      54  	      __mach_port_deallocate (__mach_task_self (), file);
      55  	      return -1;
      56  	    }
      57  	}
      58        else
      59  	{
      60  	  err = HURD_DPORT_USE (dirfd,
      61  	    (cwd = __hurd_canonicalize_directory_name_internal (port, NULL, 0),
      62  	     cwd == NULL ? errno : 0));
      63  	  if (err)
      64  	    {
      65  	      __mach_port_deallocate (__mach_task_self (), file);
      66  	      return __hurd_fail (err);
      67  	    }
      68  	}
      69  
      70        int res = __asprintf (&concat_name, "%s/%s", cwd, file_name);
      71        free (cwd);
      72        if (res == -1)
      73  	{
      74  	  __mach_port_deallocate (__mach_task_self (), file);
      75  	  return -1;
      76  	}
      77  
      78        abs_path = concat_name;
      79      }
      80  
      81    /* Hopefully this will not return.  */
      82    err = _hurd_exec_paths (__mach_task_self (), file,
      83  			  file_name, abs_path, argv, envp);
      84  
      85    /* Oh well.  Might as well be tidy.  */
      86    __mach_port_deallocate (__mach_task_self (), file);
      87    free (concat_name);
      88  
      89    return __hurd_fail (err);
      90  }
      91  
      92  weak_alias (__execveat, execveat)