Schily's LIBRARY FUNCTIONS                             FEXECVE(3)


     fexecve() - executes a program


     fexecve (name, in, out, err, argptr, envptr)
          char *name;
          FILE *in, *out, *err;
          char **argptr, **envptr;


     fexecve() causes the current process to execute a  new  pro-
     gram.  The text, data, and stack segments of the process are
     discarded and replaced with the text and  data  sections  of
     the  new  object file and a new stack. The argument list and
     environment list are copied into the new address space where
     they become the arguments to the entry point of the new pro-

     name is a string containing the name of the object  file  to
     be executed. If the name contains a slash (/), it is assumed
     to be a pathname to the file. If there  is  no  slash,  fex-
     ecve()  searches  for the file in a list of directories con-
     tained in the environment variable PATH, or if there  is  no
     such variable, it searches the working directory first, then
     /bin. The  PATH  variable  (which  is  taken  from  the  new
     environment  list  envptr ) has a value which is a series of
     directory names separated by colons. The  working  directory
     is  represented  in this list by omitting a name (before the
     first colon, between two colons, or after the  last  colon).
     Thus the default search rules may be expressed as


     in, out, and err are files which are to be  substituted  for
     stdin,  stdout,  and stderr, respectively, when the new pro-
     gram is executed.

     argptr and envptr are pointers  to  arrays  of  pointers  to
     strings,  with  a  NULL  pointer  as the last element of the
     array. By convention, argptr[0] is the name of the program.


     Returns a standard system error  code;  fexecve()  does  not
     return  if  it  succeeds, as the program that calls it is no
     longer in this process's memory.


     If a program needs to run another program without destroying
     itself,  it can use fork(), some variation of fexecve(), and
     cwait(). These three functions are combined in spawnl()  and

Joerg Schilling    Last change: 15. Juli 1988                   1

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