usr/src/lib/libast/common/comp/execvpe.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_lib.h>
  25
  26 #if _lib_execvpe
  27
  28 #include <ast.h>
  29
  30 NoN(execvpe)
  31
  32 #else
  33
  34 #if defined(__EXPORT__)
  35 __EXPORT__ int execvpe(const char*, char* const[], char* const[]);
  36 #endif
  37
  38 #include <ast.h>
  39 #include <errno.h>
  40
  41 #if defined(__EXPORT__)
  42 #define extern  __EXPORT__
  43 #endif
  44
  45 extern int
  46 execvpe(const char* name, char* const argv[], char* const envv[])
  47 {
  48         register const char*    path = name;
  49         char                    buffer[PATH_MAX];
  50
  51         if (*path != '/' && !(path = pathpath(buffer, name, NULL, PATH_REGULAR|PATH_EXECUTE)))
  52                 path = name;
  53         execve(path, argv, envv);
  54         if (errno == ENOEXEC)
  55         {
  56                 register char** newargv;
  57                 register char** ov;
  58                 register char** nv;
  59
  60                 for (ov = (char**)argv; *ov++;);
  61                 if (newargv = newof(0, char*, ov + 1 - (char**)argv, 0))
  62                 {
  63                         nv = newargv;
  64                         *nv++ = "sh";
  65                         *nv++ = (char*)path;
  66                         ov = (char**)argv;
  67                         while (*nv++ = *++ov);
  68                         path = pathshell();
  69                         execve(path, newargv, envv);
  70                         free(newargv);
  71                 }
  72                 else
  73                         errno = ENOMEM;
  74         }
  75         return -1;
  76 }
  77
  78 #endif