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 implementation using the NT or Windows process primitives.

SEE ALSO¶

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