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);
}