shithub: 9intro

ref: a351bcdccdf5a4273bc8dc3360a48fbb8b8aa9ea
dir: /progs/box.c.ms/

.P1
.ps -1
.ti -1i
.B
.BX box.c
.ps +1
.CW
.ps -2
.vs .15i
#include <u.h>
#include <libc.h>
#include <auth.h>	// for newns
void
main(int argc, char* argv[])
{
	char*	user;

	if (argc != 2){
		fprint(2, "usage: %s ns prog\en", argv0);
		sysfatal("usage");
	}
	switch(rfork(RFPROC|RFNAMEG)){
	case -1:
		sysfatal("fork: %r");
	default:
		waitpid();
		exits(nil);
	case 0:
		user = getuser();
		if (newns(user, argv[1]) < 0)
			sysfatal("newns: %r");
		rfork(RFNOMNT);
		execl(argv[1], argv[1], nil);
		sysfatal("exec: %r");
	}
}

.ps +2
.P2