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#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);
}
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