Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/cmd/unix/drawterm/kern/sysproc.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#include	"u.h"
#include	"lib.h"
#include	"dat.h"
#include	"fns.h"
#include	"error.h"

long
sysexits(ulong *arg)
{
	char *status;
	char *inval = "invalid exit string";
	char buf[ERRMAX];

	status = (char*)arg[0];
	if(status){
		if(waserror())
			status = inval;
		else{
			validaddr((ulong)status, 1, 0);
			if(vmemchr(status, 0, ERRMAX) == 0){
				memmove(buf, status, ERRMAX);
				buf[ERRMAX-1] = 0;
				status = buf;
			}
		}
		poperror();

	}
	pexit(status, 1);
	return 0;		/* not reached */
}


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