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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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