sysdeps/mach/hurd/execve.c

   1 /* Copyright (C) 1991, 1992 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <hurd.h>
  24
  25 /* Replace the current process, executing PATH with arguments ARGV and
  26    environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
  27 int
  28 DEFUN(__execve, (path, argv, envp),
  29       CONST char *path AND char *CONST argv[] AND char *CONST envp[])
  30 {
  31   error_t err;
  32   file_t file;
  33   char *args, *env, *ap;
  34   size_t argslen, envlen;
  35   int ints[INIT_INT_MAX];
  36   mach_port_t ports[INIT_PORT_MAX];
  37   file_t *dtable;
  38   int dtablesize;
  39   int i;
  40   char *const *p;
  41   task_t task;
  42   int flags;
  43   struct _hurd_sigstate *ss;
  44
  45   file = __hurd_path_lookup (path, FS_LOOKUP_EXECUTE, 0);
  46   if (file == MACH_PORT_NULL)
  47     return -1;
  48
  49   argslen = 0;
  50   p = argv;
  51   while (*p != NULL)
  52     argslen += strlen (*p++) + 1;
  53   args = __alloca (argslen);
  54   ap = args;
  55   for (p = argv; *p != NULL; ++p)
  56     ap = __memccpy (ap, *p, '\0', UINT_MAX);
  57
  58   envlen = 0;
  59   p = envp;
  60   while (*p != NULL)
  61     envlen += strlen (*p++) + 1;
  62   env = __alloca (envlen);
  63   ap = env;
  64   for (p = envp; *p != NULL; ++p)
  65     ap = __memccpy (ap, *p, '\0', UINT_MAX);
  66
  67   __mutex_lock (&_hurd_lock);
  68   ports[INIT_PORT_CCDIR] = _hurd_ccdir;
  69   ports[INIT_PORT_CWDIR] = _hurd_cwdir;
  70   ports[INIT_PORT_CRDIR] = _hurd_crdir;
  71   ports[INIT_PORT_AUTH] = _hurd_auth;
  72   ports[INIT_PORT_PROC] = _hurd_proc;
  73   ints[INIT_UMASK] = _hurd_umask;
  74   ints[INIT_CTTY_FSTYPE] = _hurd_ctty_fstype;
  75   ints[INIT_CTTY_FSID1] = _hurd_ctty_fsid.val[0];
  76   ints[INIT_CTTY_FSID2] = _hurd_ctty_fsid.val[1];
  77   ints[INIT_CTTY_FILEID] = _hurd_ctty_fileid;
  78
  79   ss = _hurd_thread_sigstate (__mach_thread_self ());
  80   ints[INIT_SIGMASK] = ss->blocked;
  81   ints[INIT_SIGIGN] = 0;
  82   for (i = 1; i < NSIG; ++i)
  83     if (ss->actions[i].sa_handler == SIG_IGN)
  84       ints[INIT_SIGIGN] |= __sigmask (i);
  85
  86   if (ss->vforked)
  87     {
  88       /* This thread is vfork'd.  */
  89       task = MACH_PORT_NULL;
  90       flags = FS_EXEC_NEWTASK;
  91     }
  92   else
  93     {
  94       task = __mach_task_self ();
  95       flags = 0;
  96     }
  97
  98   __mutex_lock (&_hurd_dtable_lock);
  99   if (_hurd_dtable.d != NULL)
 100     {
 101       dtablesize = _hurd_dtable.size;
 102       dtable = __alloca (dtablesize * sizeof (file_t));
 103       for (i = 0; i < dtablesize; ++i)
 104         if (_hurd_dtable.d[i].flags & FD_CLOEXEC)
 105           dtable[i] = MACH_PORT_NULL;
 106         else
 107           dtable[i] = _hurd_dtable.d[i].server;
 108     }
 109   else
 110     {
 111       dtable = _hurd_init_dtable;
 112       dtablesize = _hurd_init_dtablesize;
 113     }
 114
 115   err = __file_exec (file, task,
 116                      args, argslen, env, envlen,
 117                      dtable, dtablesize,
 118                      ints, INIT_INT_MAX,
 119                      ports, INIT_PORT_MAX,
 120                      flags);
 121   /* We must hold the dtable lock while doing the file_exec to avoid
 122      the dtable entries being deallocated before we send them.  */
 123   __mutex_unlock (&_hurd_dtable_lock);
 124   if (err)
 125     return __hurd_fail (err);
 126
 127   if (ss->vforked)
 128     longjmp (ss->vfork_saved.continuation, 1);
 129
 130   __mutex_unlock (&ss->lock);
 131
 132   /* That's interesting.  */
 133   return 0;
 134 }