authorize.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#include "common.h"
#include "send.h"

/*
 *  Run a command to authorize or refuse entry.  Return status 0 means
 *  authorize, -1 means refuse.
 */
void
authorize(dest *dp)
{
	process *pp;
	String *errstr;

	dp->authorized = 1;
	pp = proc_start(s_to_c(dp->repl1), (stream *)0, (stream *)0, outstream(), 1, 0);
	if (pp == 0){
		dp->status = d_noforward;
		return;
	}
	errstr = s_new();
	while(s_read_line(pp->std[2]->fp, errstr))
		;
	if ((dp->pstat = proc_wait(pp)) != 0) {
		dp->repl2 = errstr;
		dp->status = d_noforward;
	} else
		s_free(errstr);
	proc_free(pp);
}