Subversion Repositories planix.SVN

#include <u.h>

#include <libc.h>

void error(char *);

void

main(int argc, char **argv)

{

	Dir *d;

	int swapfd, cswfd;

	char buf[128], *p;

	int i, j;

	if(argc != 2) {

		print("Usage: swap path\n");

		exits("swap: failed");

	}

	d = dirstat(argv[1]);

	if(d == nil){

		print("swap: can't stat %s: %r\n", argv[1]);

		exits("swap: failed");

	}

	if(d->type != 'M'){		/* kernel device */

		swapfd = open(argv[1], ORDWR);

		p = argv[1];

	}

	else {

		p = getenv("sysname");

		if(p == 0)

			p = "swap";

		sprint(buf, "%s/%sXXXXXXX", argv[1], p);

		p = mktemp(buf);

		swapfd = create(p, ORDWR|ORCLOSE, 0600);

	}

	if(swapfd < 0 || (p[0] == '/' && p[1] == '\0')) {

		print("swap: failed to make a file: %r\n");

		exits("swap: failed");

	}

	i = create("/env/swap", OWRITE, 0666);

	if(i < 0) 

		error("open /env/swap");

	if(write(i, p, strlen(p)) != strlen(p))

		error("sysname");

	close(i);

	print("swap: %s\n", p);

	cswfd = open("/dev/swap", OWRITE);

	if(cswfd < 0)

		error("open: /dev/swap");

	j = sprint(buf, "%d", swapfd);

	if(write(cswfd, buf, j) != j)

		error("write: /dev/swap");

	exits(0);

}

void

error(char *s)

{

	perror(s);

	exits(s);

}