Import sources from 2011-03-30 iso image

1 files changed, 66 insertions, 0 deletions

diff --git a/sys/src/cmd/swap.c b/sys/src/cmd/swap.c
new file mode 100755
index 000000000..6350caff5
--- /dev/null
+++ b/sys/src/cmd/swap.c
@@ -0,0 +1,66 @@
+#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);
+}