usr/src/lib/libast/common/comp/execve.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 #include <ast.h>
  25
  26 #if _lib_execve
  27
  28 NoN(execve)
  29
  30 #else
  31
  32 #include <sig.h>
  33 #include <wait.h>
  34 #include <error.h>
  35
  36 static pid_t            childpid;
  37
  38 static void
  39 execsig(int sig)
  40 {
  41         kill(childpid, sig);
  42         signal(sig, execsig);
  43 }
  44
  45 #if defined(__EXPORT__)
  46 #define extern  __EXPORT__
  47 #endif
  48
  49 extern int
  50 execve(const char* path, char* const argv[], char* const arge[])
  51 {
  52         int     status;
  53
  54         if ((childpid = spawnve(path, argv, arge)) < 0)
  55                 return(-1);
  56         for (status = 0; status < 64; status++)
  57                 signal(status, execsig);
  58         while (waitpid(childpid, &status, 0) == -1)
  59                 if (errno != EINTR) return(-1);
  60         if (WIFSIGNALED(status))
  61         {
  62                 signal(WTERMSIG(status), SIG_DFL);
  63                 kill(getpid(), WTERMSIG(status));
  64                 pause();
  65         }
  66         else status = WEXITSTATUS(status);
  67         exit(status);
  68 }
  69
  70 #endif