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execvpe.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast_lib.h>

#if _lib_execvpe

#include <ast.h>

NoN(execvpe)

#else

#if defined(__EXPORT__)
__EXPORT__ int execvpe(const char*, char* const[], char* const[]);
#endif

#include <ast.h>
#include <errno.h>

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern int
execvpe(const char* name, char* const argv[], char* const envv[])
{
      register const char*    path = name;
      char              buffer[PATH_MAX];

      if (*path != '/' && !(path = pathpath(buffer, name, NULL, PATH_REGULAR|PATH_EXECUTE)))
            path = name;
      execve(path, argv, envv);
      if (errno == ENOEXEC)
      {
            register char**   newargv;
            register char**   ov;
            register char**   nv;

            for (ov = (char**)argv; *ov++;);
            if (newargv = newof(0, char*, ov + 1 - (char**)argv, 0))
            {
                  nv = newargv;
                  *nv++ = "sh";
                  *nv++ = (char*)path;
                  ov = (char**)argv;
                  while (*nv++ = *++ov);
                  path = pathshell();
                  execve(path, newargv, envv);
                  free(newargv);
            }
            else
                  errno = ENOMEM;
      }
      return -1;
}

#endif

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