text: execve - execute program
  #include <unistd.h>
  int execve (const char *filename, const char *argv [],
  const char *envp[]);
  execve() executes the program pointed to by filename.
  filename must be either a binary executable, or a shell
  script starting with a line of the form "#! interpreter
  [arg]".
  parent process are cleared.
  If the current program is being ptraced, a SIGTRAP is sent
  to it after a successful execve().
  On success, execve() does not return, on error -1 is
  returned, and errno is set appropriately.
  EACCES The file is not a regular file.
  EACCES Execute permission is denied for the file.
  EPERM The file system is mounted noexec.
  EPERM The file system is mounted nosuid and the file has
  an SUID or SGID bit set.
  E2BIG The argument list is too big.
  ENOEXEC
  The magic number in the file is incorrect.
  EFAULT filename points outside your accessible address
  space.
  ENAMETOOLONG
  filename is too long.
  ENOENT The file does not exist.
  ENOMEM Insufficient kernel memory was available.
  ENOTDIR
  A component of the path prefix is not a directory.
  EACCES Search permission is denied on a component of the
  path prefix.
  ELOOP filename contains a circular reference (i.e., via a
  symbolic link)
  SVID, AT&T, POSIX, X/OPEN, BSD 4.3
  SUID and SGID processes can not be ptrace()'d SUID or
  SGID.
  A maximum line length of 127 characters is allowed for the
  first line in a #! executable shell script. This may be
  circumvented by changing the max size of buf, in which
  case you will become bound by the 1024 byte size of a
  buffer, which is not easily worked around.
  execl(3), fork(2)