spawnveg(3)

NAME

       spawnveg - process spawn with process group and session control

SYNOPSIS

       #include <ast.h>

       int  spawnveg(const  char*  command,  char**  argv,  char** envv, pid_t
       pgid);

DESCRIPTION

       spwanveg combines fork(2), exec(2), setpgid(2)  and  setsid(2)  into  a
       single call.

       command,  argv  and  envv  are  as in execve(2).  pgid controls the new
       process group and session:

       <0     The new process becomes a session  leader.   is  called  in  the
              child context.

       0      The new process is in the callers process group.

       1      The new process becomes a process group leader.

       >1     The new process joins the process group pgid.

COMMENTS

       It  is  possible to code all process creation (except for vfork(2) hack
       like in csh(1)) using spawnveg.  The proc(3)  routines  and  ksh(1)  do
       this  on  systems that don't support fork(2).  This makes porting to NT
       and Windows a snap: a simple iffe(1) probe provides a  spawnveg  imple-
       mentation using the NT or Windows process primitives.

SEE ALSO

       fork(2), exec(2), setpgid(2), setsid(2), spawnve(2)

                                                                   SPAWNVEG(3)