67 lines
1.1 KiB
C
67 lines
1.1 KiB
C
#include <u.h>
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#include <libc.h>
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void error(char *);
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void
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main(int argc, char **argv)
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{
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Dir *d;
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int swapfd, cswfd;
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char buf[128], *p;
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int i, j;
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if(argc != 2) {
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print("Usage: swap path\n");
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exits("swap: failed");
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}
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d = dirstat(argv[1]);
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if(d == nil){
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print("swap: can't stat %s: %r\n", argv[1]);
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exits("swap: failed");
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}
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if(d->type != 'M'){ /* kernel device */
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swapfd = open(argv[1], ORDWR);
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p = argv[1];
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}
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else {
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p = getenv("sysname");
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if(p == 0)
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p = "swap";
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sprint(buf, "%s/%sXXXXXXX", argv[1], p);
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p = mktemp(buf);
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swapfd = create(p, ORDWR|ORCLOSE, 0600);
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}
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if(swapfd < 0 || (p[0] == '/' && p[1] == '\0')) {
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print("swap: failed to make a file: %r\n");
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exits("swap: failed");
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}
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i = create("/env/swap", OWRITE, 0666);
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if(i < 0)
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error("open /env/swap");
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if(write(i, p, strlen(p)) != strlen(p))
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error("sysname");
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close(i);
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print("swap: %s\n", p);
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cswfd = open("/dev/swap", OWRITE);
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if(cswfd < 0)
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error("open: /dev/swap");
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j = sprint(buf, "%d", swapfd);
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if(write(cswfd, buf, j) != j)
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error("write: /dev/swap");
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exits(0);
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}
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void
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error(char *s)
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{
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perror(s);
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exits(s);
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}
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